THE NAUTILUS. IX 



Strophitus wrightianus Walker, n. sp. . 65 



Succinea nnttalliana Lea ... . 129 



Tamiosoma Conrad, a sessile Cirripede . . . 120 



Tethys (Neaplysia) ritteri Cockerell, n. sp. . 90 



Texas oil-well fossil ...... .74 



Tornatellina inexpectata Pils., n. sp. ... .23 



Trachypleura triadomarchica ... 



Trishoplita collinsoui var. casta Pils., n. var. . .19 



Trishoplita hiugensis Pils., n. sp. . 20 



Truncatella stimpsoni guadalupensis Pils., n. var. . 83 



Truncatella subcylindrica Linn. . . . . .119 



Truncatella 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. ...... l'-3, 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 



