THE NAUTILUS. VU 



Somatogyrus decipiens Walker, n. sp. (PL VI, figs. 10, 11). 86 

 Somatogyrus hendersoni "Walker, n. sp. (PL VI, fig. 2) . 87 

 Somatogyrus hinkleyi Walker, n. sp. (PL VI, figs. 8, 9) . 87 

 Somatogyrus pygmaeus Walker, n. sp. (PL VI, fig. 3) . 88 



Sphaerium pilsbryanum Sterki, n. sp. . . . . . 141 



Strange shells ......... 110 



Strobilops, Notes on the genus .78 



Strobilops quadrasi and S. trochospira . . . .79 



Stylommatophora, Some notes on the locomotive disk of . 49 

 Tagolanda, Land shells of . . . . . . .46 



Terebratula (Liothyris) sakhalinensis DalL, n. sp. . . 28 

 Texas, List of the shells from Amarillo .... 9 



Texas, MoUusca of McLennan County . . . .63 



Torinia discoidea sterkii Pils. & Van., n. subsp. (fig. 2) . 57 

 Trishoplita cretacea pergranosa Pils. & Hir., n. subsp. . 43 

 Trivia galapagensis. Notes on . . . . . .11 



Trivia mangerise, Note on . . . . . . .10 



Turbonilla (Chemnitzia) gabbiana . . . . .39 



Turbonilla (Chemnitzia) thaanumi Pils. & Van., n. subsp, 



(fig. 3) 58 



Unionidse, Supplementary notes on the breeding seasons 



of the Ill 



TJnionidee in Pennsylvania, The breeding season of . 91, 99 

 Unioninse and Hyriinee, Remarks on the sub-families . 106 



Valvata humeralis californica Pils., n. subsp. . . .82 



Verrill collection ........ 33 



Verticordia (Haliris) granuloides Aldr., n. sp. (PI. V, fig. 10). 75 

 Vertigo nylanderi Sterki, n. sp. . . . . . . 107 



Vesicomya ticaonica DalL, n. sp. ..... 63 



Vivipara lecythoides Bens, in California . . . .33 



Waldheimia raphealis var. albida . . . . .30 



Yates, Dr. Lorenzo G. (obituary) ..... 124 



