54 AMERICAN CORBICULAD^. 



Fig. 53. shell, though not very distinct ; epidermis dark greenish- 



brown ; valves slight, very convex ; cardinal teeth very 

 small ; lateral teeth strong, very much drawn up and 

 shorter than they usually are in other species. 



Long. 0.25 ; Lat. 0.20 ; Diam. 0.15 inches. 

 Hah. Barbados, West Indies. (Cabinet of Prime.) 



,s. barijailense. Splia-rium larbadense, Prime, Proc Acad. Nat. Sci. 



Phila. ISGl, 415. 



I have but one specimen of this species, which seems to be 

 closely allied to S. hahiense ; it is, however, much larger, more 

 globose, and its beaks are not as much raised. 



33. Spliaeriiam ntodiolifornae, Anton. — Animal not observed. 



Shell small, ovate oblong, moderately iullated, inequilateral, translucent ; 

 anterior and basal margins rounded, jjosterior somewhat distended and 

 subtruncate ; beaks inclined towards the anterior, prominent, calyculate ; 

 valves slight, convex ; epidermis dark yellow, irregularly spotted with a 

 darker color ; striae hardly visible ; teeth very small ; hinge-margin some- 

 what curved, very narrow. 



Long. 0.31 ; Lat. 0.18 ; Diam. 0.15 inches. 



Hah. South America, in Brazil and Venezuela. (Cabinets of the Academy 

 of Natural Sciences of Philadelphia, Bourguignat, Gassies, Museum of Paris, 

 Michaud, and Museum at Leyden.) 



Cijclas modioliformis, Anton, Wiegm. Archiv, 1837, 284. 



Pisidium diaphanum, Haldeman, Proc. Acad. Nat. Sci. Phila. I, 



1841, 53. 

 Pisum 7nodioIifonne, Deshayes, Brit. Mus. Cat. 1854, 283. 

 Pisidium moquinianum, Bodrguignat, Amen. 1, 1855, 01, pi. 3, f. 13-17. 

 Cijclas moquiniana, Gassies, Pisid. 1855, f. 9. 

 Cyclas striatella, Ferussac, Museum of Paris. 

 Cijclas littoi-ulis, F^russac, Collect. Michaud. 

 Cyclas venezueJensis, Prime, Museum of Leyden. 

 Musculium modioli/orme, Adams, Rec. Gen. II, 1858, 451. 



The specimen from which this description was prepared (the 

 original shell from which Mr. Haldeman described the F. diapha- 

 num) is in the Cabinet of the Academy of Natural Sciences of 

 riuladelphia ; it was discovered in the interior of a large 

 Ampullaria from Brazil. I have never seen C. modioliformis or 

 P. moquinianum, but judging from their descriptions and from 

 the figure of the latter, I do not doubt that they belong to this 

 species. I have had occasion to examine C. striatella and C. 

 litloralis personally. 



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