196 Bulletin 29 360 



inch, width one inch." The last two words must be a printer's 

 error, for Gabb adds that it is the smallest species of Pandora 

 with which he is acquainted. Our specimens seem to be what 

 he had in mind. The convex, left valves measure 8 mm. in 

 length and 4 in altitude, the right, flat valve is slightly smaller. 

 Localities — (Exp'd '16) Bluff 3 (quite common); Bluff 2 

 (very scarce), Cercadode Mao. 



Genus Cuspid aria Nardo. 

 Cuspidaria islahispaniolce , n. sp. 



Plate 26, Figure 20 



Necera alternata Gabb, Trans. Amer. Phil. Soc, vol. 15, p. 248, 1873. 

 Not of d'Orbigny. 



Necera ornatissima Guppy, Quart. Jour. Geol. Soc. London, vol. 32, 



p. 530, 1876. Not of d'Orbigny. 



' We collected a dozen specimens of a Cuspidaria apparently 



the species which Gabb and Guppy referred to the recent, but 



showing constant differences as a comparison of our figure with 



d'Orbigny's will indicate. 



Our shells are inflated anteriorly with umbones full, beaks 

 prominent, curving; rostrum rather long, sub-truncate terminally ; 

 concentric sculpture of valves feeble; radial sculpture strong pos- 

 teriorly, invariably obsolete anteriorly; there being four to six well 

 developed radials on the posterior portion of the valves, the radi- 

 al defining the commencement of the rostrum usually forming a 

 strong carina after which the radials become progressively weaker 

 and fade out, remaining as traces around the anterior basal 

 region, but entirely absent from the umbones; no interradials are 

 present; rostrum frequently smooth, sometimes marked by one or 

 two radial threads passing from the umbo towards the base of 

 the truncation. Length 9, altitude 6, semidiameter 3 mm. 



The Bowden species C. craspedonia Dall is allied to our shell 

 but half as large, with interradials, stronger concentric sculpture, 

 and with major and minor radials which persist over the anterior 

 portion of the shell. 



Locality — (Exp'd '16) Bluff 3, Cercado de Mao. 



