34 
CATALOGUE OP ECHINIDA. 
ring, which rather resemble auricules ; mouth central, or 
rather in front of the centre; jaws none ; vent posterior, dor- 
sal, or inferior ; ambulacra formed of two series of double 
pores, petaloid ; ovarial plates five ; ocellar plates five, inter- 
calated with the ovarial plate. 
Echinolampus, Gray, Ann. Phil. 1825, x. 7. 
Galeritidse, part. ; Gray , Ann. Philos. 1825, x. 7. 
Les Echinides parocentrostomes edentes, part., Blainv. Diet. 
Sci. Nat. lx. 188, 1830 ; Deslong. in Lamk. Hist. iii. 271. 
Mesostoma, part., Lair. Fam. R. A. 553, 1825. 
Clypeasteroidea, 5, Fibularise ; Bronn , Gesch . Nat. 197. 
Des Gassidulides, § 2, des Nucleolides, Agassiz 8 f Desor , Ann. Sci. 
Nat. series iii. 1847, 153. 
Nucleolites, Lamk. Syst. 347, 1801. 
a. Mouth with stellate oral ambulacra. — Cassidulina. 
1. Cassidulus. 
Shell elongate ; mouth surrounded by a raised edge, and 
with a rosette of buccal pores ; vent superior ; ambulacra 
subpetaloid ; the pairs of pores are not united by transverse 
grooves. 
Cassidulus, Lamk. Syst. 348, 1801, Hist. iii. 338 ; Blainv. Zooph. 
310, D. S. N. lx. 191 ; Agassiz 8$ Desor , Ann. Sci. Nat. 1847, 
157. 
Nucleolites, sp., Desmoul. Syn. 354 ; Goldfuss , Petorf. 
1. Cassidulus cAMBiEAituM. 
Cassidulus caribsearum, Lamk. Syn. 349, 1801 (E. M. t. 143, 
f. 8, 10) ; Desmoul. Etud. Echin. i. 24-46. 
Cassidulus australis, Lamk. Hist. ii. 35, 1816, ed. 2, iii. 339; 
E. M. t. 143, f. 8, 10 ; Blainv. Zooph. 210 ; M. Edw. Cuvier , 
Reg. Anim. Crochard. Rad. t. 15, f. 3 ; Agassiz 6$ Desor , 1. c. 
157. 
Cassidulus Richardi, Delong; E.M. t. 2, f. 174. 
Nucleolites Richardi, Desmoul. Echin. 354. 
Var. 1. Cassidulus Guadaloupensis, Duchaissaigne ; Bull , 
Soc. Geol. Trans. 1847 ; Agassiz &; Desor, 1. c. 157. 
Hab. West Indies, Spanish Town. Mus. Paris. 
2. Echinolampas. 
Shells elongate or subdiscoidal, concave beneath ; summit 
generally excentric ; ambulacra broad, often produced at the 
end ; mouth medial ; oral membrane quite naked ; vent trans- 
