NUCLE0L1DAE. 551 



NUCLEOLIDAE. 



Subfamily Nucleolidae Agass., 18-17, C. R. Ann. Sc. Nat., VII. 147. 



The ambulacral petals are petaloid or subpetaloid. The odd ambulacrum 

 not different from the lateral ambulacra. Actinostome pentagonal, its sides 

 on one level, with prominent bourrelets and well-developed phyllodes. 



NEOLAMPAS. 



Neolampas A. Ac, 186 9, Bull. M. C. Z., I. 

 (See Part II. p. 340.) 



Neolampas rostellata 



! Neolampas rostellatus A. Ac, 1869, Bull. M. C. Z., I. No. 9, p. 271. 

 (See Part II. p. 340.) 



PL XVII. f. 1-12. 



Straits of Florida. 



ECHINOLAMPAS. 



Echinolampas Gray, 1825, Ann. Phil. 

 (See Part II. p. 335.) 



Echinolampas depressa 



I Echinolampas depressus Gray, 1851, Ann. Mag. N. H., p. 38. 

 (See Part II. p. 335.) 



PL XVI 



The specimens of this species in the British Museum were readily distin- 

 guished from E. oviformis by the large, elliptical actinostome, more central, 

 deeply sunken ; floscelle not flush, as in E. oviformis, with indistinct bour- 

 relets. The anal system is large, elliptical, elongated, with the test projecting 

 posteriorly more than in E. oviformis. Outline of test posteriorly convex. 

 Tubercles larger than in E. oviformis. In the unequally developed petals the 

 posterior zones of the posterior petals are the shortest, the anterior zones in 

 the anterior petals, and the left odd anterior zone. The pores of the inner 

 and outer zones are of the same size. 



Straits of Florida. 



