62 PROCEEDINGS OF THE NATIONAL MUSEUM vol. CG 



CADULUS PARIANUS Guppy 



Cadulus parianus Guppy, U. S. Nat. Mus. Proc, vol. 19, p. 325, pi. 30, fig. 7, 



1896. 

 Cadulus parianus Mauby, Bull. Amer. Paleont., vol. 10, no. 42, p. 182, 1925. 



" Tube round, tapering, suddenly constricted near the broader end. 

 Lon. 3, diam. 0.75 mm." (Guppy 1896). 



The figured type well portrays the character of the species. The 

 posterior end is suddenly contracted as shown in the photograph. 

 On all specimens received with the type from Pointe-a-Pierre, the 

 type locality, this feature is present, and is one of the outstanding 

 characters of the species. One specimen belonging to this species 

 was received with the later collection, station 8586, Pointe-a-Pierre. 



Genus DENTALIUM Linnaeus 



DENTALIUM COSSMANNIANUM PUsbry and Sharp? 



Dentalium disshmile, variety, Gabb. Amer. Philos. Soc. Trans., vol. l.j. p. 244, 



1873. 

 Dentalium cossmannianum Pilsbry and Sharp, Acad. Nat. Sci. Phila. Proc, 



vol. 49, p. 467, pi. 10, fig. 11; pi. 11, figs. 10, 11, 1897 (1898). 

 Dentaliwm cossmannianum Pilsbry and Sharp, Maury. Bull. Amer. Paleont., 



vol. 5, p. 323, pi. 52, fig. 3, 1917. 

 Dentalium cossmannianum, Pn>SBRY and Sharp, Pilsbry, Acad. Nar. Sci. 



Phila. Proc., p. 399, 1922. 



There are a number of fragments, collected at station 8302, one 

 mile south of Brasso, that appear to belong to this species. One 

 larger fragment is marked with very faint interaxial longitudinal 

 threads, a feature not shown on the Dominican species, otherwise it 

 agrees with that species. 



The Dominican species was collected from the Gurabo formation 

 during the U. S. Geological Survey reconnaissance to that island in 

 1919. 



Dentalium bocasensis Olsson, referred to the Gatun stage and 

 collected from Bocas del Toro, Panama, possesses intermediate longi- 

 tudinal ribs aside from the six primary ones. The indeterminate 

 species may be^closer to that species. 



DENTALIUM, species 



There are several fragments of Dentalium at station 8301, Mach- 

 apoorie Quarry, representing mainly only the early part of the shell. 

 In general, they recall Dentalium gabhi Pilsbry and Sharp, and 

 may prove when better specimens are obtained to be closely related 

 to that species. The very earliest part is hexagonal in outline. The 

 upper extremity is well rounded and reveals indistinct axials, per- 

 haps being obliterated by corrosion. Their relationship to the forms 

 at station 8302 apparently is very close. 



