l84 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I44 



smoothly rounded anterior margin, slightly truncated posterior ; low, 

 with gently sloping sides, adoral surface flat. 



Apical system. — Anterior, monobasal. 



Ambulacra. — Petals broad, of equal length, closing distally. Porif- 

 erous zones narrow, of unequal length in holotype : six more pore 

 pairs in right poriferous zone in petal III than in left, two more in 

 posterior poriferous zones of petals II and IV than in anterior zones, 

 and approximately five more in outer poriferous zones of petals V 

 and I. Pores conjugate, outer pore slightly elongated transversely, 

 inner pore round. Interporiferous zones wide, almost three times 

 as wide as poriferous zones, tapering distally. 



Pcriproct. — Marginal to slightly supramarginal, transverse. 



Peristome. — Anterior, small, pentagonal, transverse. 



Floscelle. — Bourrelets well developed, vertical, inflated. Phyllodes 

 (text fig. 153) single pored, pores arranged in two series in each 

 half -ambulacrum ; approximately eight in each outer series, four or 

 five in each inner. Sphaeridia pits in two rows along midline of 

 ambulacrum. Buccal pores present. 



Tuber dilation. — Adorally, tubercles larger, with naked, slightly 

 pitted area in interambulacrum 5 and ambulacrum III. 



Occurrence. — Eocene, western side of hills east of Montpelier, 

 St. James Parish, Jamaica. 



Location of type specimen. — Museum of Comparative Zoology, 

 Harvard, No. 3284. 



Remarks. — Arnold and Clark distinguished their genus from Cas- 

 sidulus on the grounds that the petals in Anisopetalus have poriferous 

 zones of unequal length. However, as pointed out by Cooke (1959, 

 p. 59) the poriferous zones in Cassidulus are also unequal. R. ellip- 

 ticus is very similar to species of Rhyncholampas , and Anisopetalus 

 is herein considered a synonym of Rhyncholampas. The poriferous 

 zones of its petals are narrower, and its periproct is slightly more 

 posterior, than usually found in Rhyncholampas, but these differences 

 do not seem to warrant generic distinction for this species, 



Santos' (1958, p. 11) Anisopetalus oliveirai from the Miocene of 

 Brazil is an Echinolampas (see p. 107). 



Synonym of RHYNCHOLAMPAS 



Galerolampas Cotteau, 1889. Pal. franc, Tert., fichinides liocenes, vol. 2, p. i. 

 Type species by monotypy, Galerolampas sorigneti Cotteau (op. cit., p. 3). 



Remarks. — Lambert and Thiery (1921, p. 371) considered Galero- 

 lampas as a subgenus of Rhyncholampas, and although Mortensen 



