126 



J.A. ALLEN AND H.L. SANDERS 



H 



Fig. 39. Propeleda carpenteri. External lateral view of the left valve and an internal view of the same valve of a syntype USNM 63151 

 Barbados in lOOfms. Scale = 1mm. 



from off 



limits of dorsal and ventral carinae; escutcheon lanceolate; hinge 

 plates relatively broad, posterior plate short, occupying little more 

 than half of postero-dorsal margin, anterior plate approximately half 

 length of posterior, hinge teeth acute chevron-shape, relatively few 

 in number, up to 18 in posterior series and 16 in anterior; ligament 

 internal, oblique, posterior to umbo; internal shell ridge extends 

 from mid posterior margin to approximately opposite the mid-point 

 of the posterior hinge plate between and parallel to the lines of the 



post-umbonal carinae. The maximum length of the present speci- 

 mens is 15.3mm. 



In most specimens the posterior shell margin is damaged, often 

 being markedly shortened and specimens frequently show regenera- 

 tion of the shell posterior to the posterior adductor. The repaired 

 shell is without concentric ornamentation. It is possible that ex- 

 tended siphons are predated upon and that the shell is damaged when 

 this occurs. 



Fig. 40. Propeleda carpenteri. External lateral view of the right side of a shell and an internal lateral view of a right valve from Atlantis II station 237 

 from the Argentine Basin. Scale = 1mm. 



