110 BULLETIN OF THE 



species ; but they resemble the figure so closely, and do not so well agree with 

 any of the Northern forms, that for the time it seems more desirable to allow 

 them to remain provisionally under the name of oblonga. In Poulsen's cata- 

 logue of West Indian shells an undetermined species of Pandora is mentioned, 

 which is doubtless the same as those obtained by the Blake. It is possible, 

 however, that both may be referable to a form of the Mediterranean P. rostrata. 



(?) Thracia phaseolina Kieneb. 



T.phaseolina Philippi, Moll. Sic, I., t. 1, fig. 7, 1836. 



T. papyracta Jeffreys, Brit. Conch., V., PL XLVIII. fig. 4. 



A single right valve about half an inch long, which seems referable to this 

 species, was obtained in Yucatan Strait, at 640 fms. 



Neaera ornatissima D'Orbigny. 



Sphena ornatissima D'Orbigny, Sagra, Moll. Cuba, II. p. 286, t. XXVII. figs. 13-16 



(1846). 

 Station 43, 339 fms. 



Several specimens obtained as above appear to differ from the species figured 

 by D'Orbigny only in size and in the greater proportional length and slender- 

 ness of the rostrum. As his specimens seem to have been young, it is prob- 

 able that their proportions were not fully developed. The Blake specimens 

 have about 25 to 28 radiating riblets, and an altitude of 4.0 mm., and a total 

 length of 8.0 mm., of which the rostrum has 3.25 mm. To distinguish it, if 

 necessary, it may take the varietal name of perrostrata. There are quite a 

 number of fine radiating lines which are intercalated between the riblets and 

 stray over part of the rostrum. These are not figured by D'Orbigny, but may 

 have existed in his specimens nevertheless. 



Neaera alternata D'Orbigny. 



Sphena alter nat a D'Orbigny, loc. cit., t. XXVII. figs. 17-20. 



Station 36, 84 fms. Station 5, 152 fms. 



Single valves, probably of this species, but with the anterior strife or riblets 

 finer and closer set, were obtained as above. 



Neaera costellata (Deshayes) Philippi. 

 Corbula costellata Dcshayes, Philippi, Moll. Sic, II. p. 13, Tab. XIII. fig. 9. 



Station 5, 229 fins. 



A left valve, measuring in Ion. l t.o, in alt 10.0, and 4.36 mm. in diameter, 

 was collected at the above-mentioned locality. It has a strong resemblance to 

 Philippi's figure above cited, but does not at all resemble the cotfaWata figured 



