FISHES OF TEXAS AND THE RIO GRANDE BASIN. 
123 
LIST OF MOLLUSCA COLLECTED IN TEXAS IN 1891. 
. [By J. A. Singley, Geological Survey of Texas.] 
The collection of mollusca, of which a list is given below, was made by Dr. R. R. 
Gurley and the writer, while engaged in investigating the waters of Texas with the 
view of establishing a fish-cultural station in that State. No new species are described, 
but a new Cytherea(C. texasiana) has been described by Dr. W. H. Dali from material 
collected at Galveston during the investigation. The list also includes a number of 
marine species not heretofore recorded from the State, and gives new localities for 
several terrestrial and fluviatile species. The arrangement is that of Tryon’s “Struc- 
tural and Systematic Conchology.” 
1. Spirula peronii Lam. Galveston and Corpus Christi. 
2. Purpura haemastoma L. Galveston and Corpus Cliristi. It is abundant on the rocks at the 
Galveston jetty. 
3. Pasciolaria gigantea Kien. Corpus Christi. Given on the authority of Dr. Gurley. I have not 
seen the species. 
4. Fulgur perversa L. Corpus Christi and Galveston. Common at both places. 
5. Fulgur pyrum Dillwyn. Galveston and Corpus Christi. Not common. 
6. Nassa vibex Say. Galveston; heach-worn examples. Abundant, living at Corpus Christi, in 
Corpus Christi Bay and Laguna Madre. The Texas examples are dwarfed. 
7. Nassa acuta Say. Common on Galveston Beach the latter part of November. A few beach- 
worn examples were found at Corpus Christi. 
8. Olivella mutica Say. Beach-worn examples were found at Galveston. 
9. Oliva liter ata Lam. A few broken shells found on Galveston Beach. 
10. Anachis obesa C. B. Ad. Galveston and Corpus Christi; dead shells, not rare. 
11. Astyris lunata Say. Dead and worn shells common on Galveston Beach, abundant living at 
Shamrock Cove, Corpus Christi Bay. 
12. Terebra concava Say. Galveston Beach; not common; dead and worn shells only. 
13. Terebra dislocata Say. Galveston Beach; commoner than the preceding and better preserved. 
14. Mangilia cerinella Dali. Common at Galveston and Corpus Christi. 
15. Natica duplicata Say. Galveston and Corpus Christi. An elevated and a depressed form are 
found. Common. 
16. Natica pusilla Say. Galveston; beach-worn examples only. Not common. 
17. Sigaretus perspectivus Say. Common on Galveston Beach. 
18. Crepidula fornicata L. Abundant at Corpus Christi. A few found on Galveston Beach. 
19. Crepidula plana Say. Galveston and Corpus Christi. Common. 
20. Crepidula convexa Say. Corpus Christi. The species is given on the authority of Dr. Gurley. 
21. Solarium verrucosum Phil. Galveston Beach, rare. Padre Island, Corpus Christi Bay, common. 
22. Scala contorquata Dali. Galveston. Given on the authority of Dr. Gurley. 
23. Turbonilla interrupta Totten. Galveston Beach. Not common. 
24. Litorina irrorata Say. Abundant along the shore of Galveston Bay near Swan Lake. 
25. Modulus lenticularis Chem. Corpus Christi. Given on the authority of Dr. Gurley. 
26. Cerithium variabile C. B. Ad. Abundant in Shamrock Cove, Corpus Christi Bay. 
27. Bittium varium Pfr. Galveston and Corpus Christi; abundant. 
28. Bittium cerithidioides Dali. Galveston (Dr. Gurley). 
29. Seila terebralis C. B. Ad. Dead shells found on the beach near Corpus Christi. 
30. Groniobasis pleuristriata Say. Comal Creek, New Braunfels. The species is not common. 
31. Goniobasis comalensis Pilsbry. Comal Springs and Guadalupe River, New Braunfels; San 
Marcos Springs and River, San Marcos. Abundant. 
32. Hydrobia texana Pilsbry. Comal Creek, New Braunfels. Not common. 
33. Pyrgula spinosaCall & Pilsbry. Comal Creek, New Braunfels. Rare. 
34. Amicola peracuta Pilsbry & Walker. Comal Creek, New Braunfels; Long Lake, Anderson 
County. Abundant. 
35. Truncatella caribbaensis Sowb. Galveston. 
