28 



BULLETIN 111, UNITED STATES NATIONAL MUSEUM. 



Although Philippi's description is very brief, his definite locahty 

 of ''Galveston" makes it possible to utilize his short diagnosis with 

 reasonable certainty. The figures of Chenu seem to indicate this 

 shell, but as they are accompanied by insufficient description and 

 with vague or no locality data, I deem it best to set them aside with a 

 query. The same reasons would apply for discarding Dentalium 

 pictei Deshayes, a manuscript name. They probably represent some 

 form of this group of which D. texasianum stands as a sort of super 

 species. Doctor Dall and Doctor Pilsbry have occasionally confused 

 this shallow water species with the former's D. gouldii, a closely 

 allied species. 



The inclusion of Brazilian specimens with a Texan type and North 

 Carolina typical specimen seems questionable, but the evidence 

 offered by the shells themselves is supplemented by the specific 

 identity of many other mollusks from these relatively distant points. 

 Nor is it entirely strange that the Florida Keys region and Antilles 

 should have contributed no examples. 



Some geographical races of this widely distributed species seem to 

 be indicated. 



DENTALIUM (DENTALIUM) TEXASIANUM TEXASIANUM Philippi. 



Plate 1, figP. 2, 4, 5, and 9. 



The shell is characterized by the flat, broad intercostal spaces in 

 which the minimum of intercalation takes place — often none what- 

 ever. This form is from Texas, Louisiana, West Florida, North 

 Carolina, and probably has a range from Yucatan to North Caro- 

 lina, exclusive of the Florida Keys and Florida east coast. 



Specimens from Pass Cabello, Texas, Cat. No. 159503, U.S.N.M., 

 collected by J. D. Mitchell, without data, measure: 



Length, 24 mm.; diameter, 2 mm. 



Length, 20 mm.; diameter, 2 mm. 



The following are the museum records: 



Locality. 



Beaufort Harbor Pish Commission, North Caro- 

 lina, Station D. 7930. 

 Off Beaufort, North Carolina, Eolis Station 21. . 

 Cape Lookout Bight, North Carolina, Station 20 



Sanibel Island , Florida 



Cameron, Louisiana 



Oalveston and Corpus Christi, Texas 



Galveston Bay, Texas 



Pass Cabello, Texas 



Inlet Chaimel, opposite Perry's Island 



Remarks. 



4 fms., S. (August, 1913). 



6-9 fms., S. 



3 fms. 



(W. F. Clapp.) 



(R. P. Cowles.) 



(Singley.) 



Do. 

 (Mitchell.) 

 Fish Commission. 



