MUSEUM OF COMPAEATIVE ZOOLOGY. 109 



which is covered with densely crowded very coarse subtubular granulations. 

 These peculiar granulations, if they can be so termed, are apparently a feature 

 common to a number of genera which are found in deep water. Jeffreys fig- 

 ures it in what he calls an Axinus (but which was referred to Verticordia by 

 Seguenza) ; it exists in all the Verticordias, in species of Neozra, Poromya, and 

 perhaps Corbula. 



Poromya (?) granatina n. s. 



This shell differs from Corbula quadrata Hinds * (P. Z. S., 1843, p. 57 ; 

 Eeeve, Conch. Icon., PI. V. fig. 40, 1844) in form and proportions, but in many 

 respects resembles that shell as figured. It is, however, of corbuloid form, 

 having the ventral margin straight, the beaks, more nearly central ; it is not 

 inflated and rounded like Hinds' species, but the posterior margin forms a 

 sharp angle with the base at the intersection of the carina, which is very pro- 

 nounced throughout its whole length, bounded by a shallow groove posteriorly, 

 beyond which the whole shell is flattened as in Hcmicardium ; in the middle 

 of this flattened area is a faint riblet bounding a small impressed lunule just 

 behind the beak, which last is not prominent ; cardinal tooth large and strong, 

 directed laterally ; shell anteriorly attenuated, perfectly white, proportionally 

 more elongated than C. quadrata and covered with the fine sub-tubular granu- 

 lations referred to previously. Lon. 10.0 ; alt. 7.0 ; diam. of right valve, 

 3.26 mm. 



Yucatan Strait, 640 fms. (one valve). 



If Recluz is correct in stating that G. quadrata has a cardinal tooth in each 

 valve it will of course be distinct from Poromya ; but a new name will have 

 to be used,! since Eucharis is preoccupied in several departments. This, how- 

 ever, may well be left until the fact is determined. Reeve says nothing about 

 the granulations on the surface of C. quadrata, but C. B. Adams states that 

 all except the posterior third is granulated ; in the present form the posterior 

 part is granulated like the rest. As a single valve in good preservation is all 

 that was obtained in this collection, the generic question cannot be yet deter- 

 mined, though the present form is probably quite nearly related to P. quadrata. 



(?) Pandora oblonga Sowerby. 



Pandora oblonrja Sby., Hanley, Recent Shells, p. 49, PI. X. fig. 46. 



Charlotte Harbor, Florida, 13 fms. ; Yucatan Strait, 640 fms. 



Left valves of a species of Pandora, exactly resembling Banley'a figure of 



P. oblonga, were obtained at the above localities. Until the other valve is 



known it will not be practicable to refer them to their proper section of the 



genus. According to Carpenter, the type specimens of P. oblonga Sbv. are 



lost, and no more are known. The present specimens may belong to another 



* The type of Eucharis Reclux. 



t There are uveal paUontologlOft] synonvnis. 





