Several unsilicified gastropod specimens were collected by John B. Mertie, Jr., on July 13, 1941, during a boat traverse along the Porcupine River of east-central Alaska. The specimens were originally deposited in the Ulrich (Cambrian and Ordovician) stratigraphic collections of the U.S. Geological Survey at the National Museum of Natural History, Washington, D.C. The collection contains one specimen of Palliseria and three specimens of Maclurites, all of which are broken from the limestone. Despite the lack of much of the shell material, they are easily identified as to genus. One specimen identified as Palliseria is particularly significant.

The marine Triassic rocks of Nevada are well known for their ichthyosaur finds, and a number of new genera and species were described from this state. Based on a few vertebrae, Leidy (1868) erected a new Middle Triassic ichthyosaur genus, Cymbospondylys, with two species, C. petrinus and C. piscosus. The type material of C. petrinus came from the Prida Formation of the southern Humboldt Range, and that of C. piscosus from the Favret Formation of the New Pass Range.

During preparation of a new species of Allodesmus from the Montesano Formation (UWBM 75640; presently being described by the writer) at the University of Washington Burke Memorial Museum in 1984, preparator Bev Witte found 14 monospecific elasmobranch teeth (UWBM 75641) in the matrix encasing the specimen. Most of the teeth were found in the matrix surrounding the cervical vertebrae; a few teeth were found near the skull (Figure 1). Unfortunately, the precise location of each tooth in relation to the pinniped skeleton was not recorded during their air-abrasive removal from the indurated matrix. It is known that the teeth were deposited no more than one or two centimeters from the skeleton. One of the matrix blocks freed from the pinniped still contains two teeth that line the inner surface of a mold of an unidentified Allodesmus bone. This is the first published occurrence of a shark from the Montesano Formation. The occurrence extends the range of Squalus occidentalis northward along the northeastern Pacific margin into Washington State, and it is also one of the highest biostratigraphic occurrences for this species. The discovery is additionally noteworthy because of the depositional relationship of the Allodesmus and Squalus, and because tooth marks occur on the Allodesmus skull. The occurrence therefore has taphonomic and paleoecological implications.

The genus Collarothyris was erected by Modzalevskaya in 1970 (p. 155) with Meristella canaliculata Wenjukow, 1899, as type species. Wenjukow (1899) did not designate a type; however, on p. 143 he gave the measurements of two specimens, one of which was figured on Plate VII, figure 21, and designated holotype by Modzalevskaya (1970, p. 156). Unfortunately, this specimen is lost (see also Nikiforova, Modzalevskaya, and Bassett, 1985). Further checking of the collections of the Geological Museum of the Geological Institute of Science, Kiev (Ukrania), resulted in finding, among Wenjukow's (1899) original collection, one specimen (No. 367/165) labelled as Meristella canaliculata and whose measurements coincide with one of those given by Wenjukow (1899, p. 143). This specimen is here figured (Figure 1) and selected lectotype of Collarothyris canaliculata (Wenjukow).