Bulletin 29 376 



Cardium ( Trigoniocardia) haiiense variet}?' cercadicicm, n. var. 

 Plate 36, Figure 6 



As noted above, this form differs from the typical in its 

 sharply angulated posterior slope and produced posterior margin. 

 Ribs usually ten on the truncation, fourteen on the body, orna- 

 mented with nodules pointing upwards. Several shells measure 

 as follows : altitude 17, length 14, diameter 12; 15 X 14X11; 

 12X11X8 mm. 



Locality. — (Exp'd '16) Bluff 2 (common), Cercado de Mao. 



Cardium ( Trigoniocardia) aminense Dall 



Cardium {Trigoniocardia} aminense Dall, Trans. Wagner Inst. Sci. , 

 vol. 3, pt. 5, p. 1104, 1900; pt. 6, pi. 48, fig. 11, 1903. 



This high, narrow species measures in altitude 14, length 

 9.5, diameter 12 mm. Body with ten to eleven high, flat ribs, 

 their wedge-shaped nodules pointing downwards ; truncation with 

 ten riblets with tear-shaped nodules. 



Type locality Potrero, Rio Amina. 



Cardium {Trig onio car dia) sambaicmn, n. sp. 

 Plate 36, Figure 7 



Shell sub-quadrate, rather thin, anterior margin roundly 

 truncate, posterior truncate, base rounded ; umbonal slope round- 

 ly angulated ; inner margin deeply serrate ; ribs on the body 

 seventeen, on the truncation ten, ribs with only a few nodules 

 preserved but showing definite marks of having been all nodose ; 

 interspaces narrower than the ribs, marked strongly by transverse 

 growth lines. Altitude 17, length 17, diameter 14 mm. 



This species resembles haitense but is squarer and has more 

 ribs. 



Locality. — (Exp'd '16) Samba Hills at an approximate al- 



titue of 540 feet. 



Cardium {LcEvicardiuin) serratum Linne 



Plate 36, Figure 8 

 Cardium serratum Linne, Syst. Nat., ed. 19, p. 68o, 1758. 

 Cardium Icevigatum Lamarck, An. s. Vert., 6, pt. 1, p. n, 1819. Not 



