1906.] NATURAL SCIENCES OF PHILADELPHIA. 125 



Bulimulus d. pecosensis Goniohasis comalensis 



Bulimulus alternatus marioe Palvdestrina seemani 



Holospira roemeri Paludestrina diaholi 



Holospira goldfussi Ammicola comalensis 



Microceramus texanus Cochliopa riograndensis 



Euglandina singleyana Potamopyrgus spinosus 



Bifidaria procera cristata Valvata micra 



Nine genera of this list are not known to occur in the Austro- 

 riparian or humid region of Texas. For list of the latter fauna, 

 the student is referred to the catalogue of Mr. J. A. Singley, cited below, 

 from which a long list of Austroriparian forms of Eastern type may 

 readily be compiled. 



The fii'st hst of Texan mollusks of any extent was published by 

 Romer in his excellent work on Texas, 1849. Numerous references 

 to the terrestrial mollusks will of course be found in Binney's successive 

 volumes. In 1878 Mr. A. G. Wetherby^ published some notes on the 

 forms he found in eastern Texas {American Naturalist for 1878, pp. 

 184, 254). The principal source of information, however, is Mr. J. A. 

 Singley's Contributions to the Natural History of Texas, part I, Texas 

 Mollusca, published in the Fourth Annvxil Rep. Geol. Survey of Texas, 

 1893. In this list Mr. Singley has included with the records of his 

 own extensive collecting, others from many sources, so that the records 

 are of unequal value. The Texan list stands much in need of revision 

 and a good many names thereon are doubtless to be rejected, either 

 because the forms do not occur in Texas, as in the case of Ampullaria, 

 or because of wrong identifications ; yet the work cannot be done until 

 resident naturalists take it up. 



HELICINID^. 

 Helicina orbiculata tropica 'Jan' Ptr. 



Texas: San Marcos, Hays county; Comal county, around New 

 Braunfels; San Antonio, Bexar county; two miles north of Hondo, 

 Medina county; Del Rio, Devil's river and High Bridge of the Pecos, 

 Val Verde county. 



Some colonies are all white; others are mingled with red or blue 

 shells. 



HELIOID^. 

 Praticolella berlandieriana (Moric). Figs. 1. 2. 



Texas: San Marcos, Hays county; Guadalupe river above New 



' By error Mr. Wetherby's name was printed "W. G. Weatherby 



