THE NAUTILUS. 63 



Vesicomya ticaonica n. sp. 



Shell ovate, tumid, inequilateral, with the beaks within the anterior 

 fourth of the length, low, prosocoelous, tumid, overhanging a large 

 cordate lunule, of which the left valve carries a somewhat large por- 

 tion ; surface rude, sculptured irregularly and strongly by incre- 

 mental lines; periostracum brownish, covering a livid whitish shell; 

 ligament rather long, set in a deep, narrow groove ; hinge as usual in 

 the genus; interior chalky-white except the polished muscular im- 

 pressions ; pallial line broad, slightly irregular, with a feeble insinu- 

 ation below the posterior adductor scars; shell tliin, margins entire. 

 Length 63, height 45, diameter 30, the beaks behind the anterior 

 end 15 mm. The ligament is about 22, and the lunule 14 mm. in 

 length. The shell is more tumid and more attenuated in front of 

 the beaks than any other described species and exceeds most of them 

 in size. 



THE MOLLUSCA OF MCLENNAN COUNTY, TEXAS. 



BY JOHN K. STRECKER, JR. 



In 1883, Mr. Henry Hemphill sent a few species of shells from 

 Waco, to Dr. W. G. Binney. These specimens are now in the 

 Binney collection in the United States National Museum (see Manual 

 of American Land Shells, Bull. U. S. Natl. Mus., No. 28, 1885, 

 pp. 477, 485, etc.). I have been unable to find any examples of 

 two of the species recorded, i. e., Praticolella griseola Pfr. and 

 Vitrea sculptilis Bland.* 



In Singley's list of Texas Mollusca (Report Geol. Survey of 

 Texas, 1893, pp. 299-343) several species of McLennan county 

 shells are mentioned. I include Biilimulus d. schiediunus Pfr. 

 in my list on this authority, although I have not collected it personally. 



Examples of all of the other species mentioned in this paper have 

 been collected by me during the past two years. Future investiga- 

 tions will doubtless bring others to light but as local lists of Texas 



'The records of these two species from Waco are in all probability erroneous ; 

 the specimens identi6ed as griseola must be a thin form of P. berlandieriana, &ud 

 the supposed V. sculptilis is V. indentata umbilicata. — Ed. 



