THE NAUTILUS. 



Strophitus wrightianus Walker, n. sp. . . . . 65 



Succinea nuttalliana Lea ....... 129 



Tamiosoma Conrad, a sessile Cirripede .... 120 



Tethys CNeaplysia) ritteri Cockerell, n. sp. . . .90 



Texas oil-well fossil ........ 14 



Tornatellina inexpectata Pils., ti. sp. . . . . .23 



Trachypleura triadomarchica ...... 8 



Trishoplita collinsoni var. casta Pils. ; n. var. . . .19 



Trishoplita hiugensis Pils., n. sp. . . . . .20 



Truneatella stimpsoni guadalupeusis Pils., n. var. . . 83 



Truneatella subcylindrica Linn. . . . . . .119 



Truneatella truncatula (Drap.) in the United States . . 35 

 Unio, a new species of ....... 65 



Unio from Missouri, description of a new . . . .74 



Unio from Tennessee, description of a new . . .115 

 Unio from Texas, a new ....... 75 



Unionidae of North America . . . . . 37, 50 



Unionidae, on the classification of the . . . .77 



Urocoptidae, new Jamaican. ...... 1 



Valvata bicarinata Lea. ....... 123 



Valvata bicarinata normalis Walker, n. var. . . . 124 



Valvata tricarinata Say. . . . . . . 123, 127 



Valvata tricarinata confusa Walker, n. var. • . . . 123 



Valvata tricarinata simplex Gould ..... 123 



Valvata tricarinata unicarinata Dekay. . . . .123 



Valvata utahensis Call. ....... 124 



Valvatas of the United States, a revision of the carinate . 121 

 Vivipara stelmaphora Bgt. of Japan, in California . . 91 

 Volutimitra, a new species of ..... . 102 



Volutimitra alaskana Dall., n. sp. ..... 103 



Wagner Free Institute of Science, Transactions of . .Ill 



Wetherby, Prof. A. G 144 



Yoldia sapotilla Gould 92 



