22 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I42 



Horizontal outline ovate; upper surface variably inflated; lower 

 surface flattish, slightly depressed around the peristome ; margin 

 broadly rounded. Apical system small; four genital pores; slightly 

 anterior. Petals extending nearly to the margin, open distally, pos- 

 terior pair the longest; poriferous zones curved, narrow, posterior 

 zone of anterior pair longer than the others; pores conjugate, inner 

 pores circular, outer pores elongated; interporiferous zones much 

 wider than the poriferous. Peristome directly beneath the apical 

 system, large, pentagonal, transversely elongated; floscelle distinct; 

 bourrelets swollen. Periproct submarginal, not visible from above, 

 transversely elongated. Tubercles small, depressed, closely covering 

 the entire test except the poriferous zones. 



Length of figured specimen 53.7 mm. ; width 47.6 mm. ; height 

 24 mm. 



Occurrence. — Trinidad: Morne Diablo quarry (Creole Petroleum 

 Co. 19070). 



Venezuela: Bejuco, Araurima Valley, Acosta district. Falcon. 



Geologic horison. — Middle Miocene: The species was described 

 from the Anguilla formation of Anguilla, B.W.I. 



Cotypes. — Six specimens, USNM 11 5388, one of which was figured 

 by Guppy. Holotype of Echinolampas anguillae USNM 1 15372. 



Figured specimen. — USNM 115387a, one of three collected by 

 Guppy but probably not in his original lot. This specimen was figured 

 also by Jackson, another by Cotteau. 



Remarks. — Echinolampas lycopersicus has been found also in 

 Puerto Rico, Cuba, and Jamaica. It varies considerably in size and 

 degree of inflation, but the shape of the petals is relatively constant. 

 The specimens from Trinidad and Venezuela are much more highly 

 inflated than the one figured from Anguilla, but others from Anguilla 

 are equally inflated. 



The holotype of Echinolampas anguillae is a unique specimen which 

 has been compressed laterally, making it proportionally narrower 

 and subconlcal, and giving a specious concavity to its lower surface. 

 Guppy (1879, p. 196), too, regarded it as an unusual form of Echino- 

 lampas lycopersicus. 



MOIRA ATROPOS (Lamarck) 



PI. 6, figs. 1-4 



Spatangus atropos Lamarck, 1816, Histoire naturelle des animaux sans vertebres, 

 vol. 3, p. 32. 



