2IO BuUvETlN 2Q 37, 



Shell with the general aspect of Guppy's Jamaican C. lingua- 

 leonis but differing in the following repects : ( i ) the ribs in the 

 Jamaican shell number 32, in the Dominican 42 ; (2) in the 

 former the ribs are sharp and surmounted by a distinct keel with 

 rippled edges, in the latter the ribs are broad, flat and smooth 

 over all the central part of the valve and there is no keel apparent ; 

 (3) the beaks of the Jamaican shells are full and high, while those 

 of the Dominican species are exceedingly low. 



The ribs on the anterior slope are faint and finely, trans- 

 versely rippled with growth lines. The last eight ribs on the 

 posterior slope have a row of pustules along their posterior edge, 

 the pustules being very minute except on the last two ribs. The 

 posterior margin of the valve is deeply serrate ; lateral teeth 

 strong. Greatest breadth 45, thickness of one valve 13 mm. 



Locality. — (Exp'd '16) Zone H, Rio Cana at Caimito. 



Cardium ( Tr achy car dium) tintinnabularum, n. sp. 

 Plate 36, Figure 3 



Shell rounded, rather thin and delicate, remarkable for its 

 beautiful and curious ornamentation ; valves sculptured with 

 many regular fine ribs which in seven shells average forty-four ; 

 the ribs over the anterior portion are adorned with what resemble 

 rows of miniature pendant sleigh bells which arise from the anter- 

 ior edges but hang over upon the crests of the ribs, on the center 

 of the valve the bells give place to small spines which first arise 

 from the crest of the ribs but gradually are shifted to the poster- 

 ior edges and finally come to lie in the interspaces. The spines 

 at first small and erect become curved and bean-shaped on the 

 posterior slope of the shell. Inner margin of valves serrate, 

 teeth sharply defined. Altitude of largest valve 20, width 20, 

 thickness 7.25 ; a shell with both valves still together meas- 

 ures 18X18X14 mm. 



Locality. — (Exp'd '16) Gravels and Zone H, Rio Cana at 

 Caimito ; Bluff 3, Cercado de Mao. 



