ECHINOLAMPAS OV1FOR.MIS. 553 



Echinolampas oviformis 



Echinus oviformis Gmel., 1788. Linn. Syst. Xat. 



! Echinolampas ociformis Gray, 1825, Ann. Phil., p. 7. 



Outline from above elliptical ; test high, swollen at the edges ; apex very 

 eccentric anteriorly ; apical system small ; poriferous zones broad ; pairs of 

 pores distant ; petals, especially the posterior pair, but little petaloid ; porif- 

 erous zones diverging ; anterior zones of anterior pair, and posterior zones 

 of posterior pair of petals much shorter than the other zones of the same 

 petals. Tuberculation distant ; mouth, in both E. oviformis and E. Hellei, 

 corresponds nearly in position with the position of the apical system. Ac- 

 tinal surface arching gradually towards the actinostome, less concave, except 

 near the actinostome, than in E. Hellei. 



Bourrelets scarcely developed, and in old specimens forming a mere thick- 

 ening of the lip of the actinostome, with phyllodes more or less indistinct. 

 The tuberculation of the actinal surface is coarser than that of the upper 

 part of the test, and more distant near the actinostome than in E. Hellei. 



Unfortunately the specimens of Echinolampas preserved in our collections 

 are usually dry tests, and little can be learned from them, excepting from the 

 short comparisons made above. 



Red Sea; Molucca Islands. 



(CASS1DULUS.) Rhynchopygus. 



Rhynchopygus D'Orbig., 1855, Pal. Franc., VL 

 (See Part II. p. 342.) 



Rhynchopygus caribaearnm 



! Cassidulus caribaearum Lamk., 1801, An. s. Vert., p. 349. 

 I Rhynchopygus caribaearum Lutk., 1864, Bid. App., p. 1. 

 (See Part II. p. 343.) 



PL XV f. 1-4; PL XXXVII. f. 12. 



D'Orbigny established the genus Rhynchopygus for Cassidulus guadelou- 

 pensis, a tertiary fossil from Guadeloupe, which is probably identical with the 

 species now found living in the West Indies and Straits of Florida. 



West India Islands. 



