38 
CATALOGUE OF ECHINIDA. 
Spatangidae, Gray, Ann. Phil. x. 1825, 8. 
Spatangi, Agassiz , Ann. Nat. Hist. i. 300, 1838. 
Spatangus and Anachitis, Lamk. Syst. i. 347. 
Les Echinides excentrostomes, Blainv. Diet. Sc. Nat. lx. 185, 
1830 ; Deslong. in Lamk. Hist. ed. 2, iii. 271. 
Les Spatangues, Agassiz, Prod. Echid . ; Deslong. in Lamk. 
Hist. ed. 2, iii. 272. 
Spatangoidea, Agassiz ; Bronn, Gesch. d? Nat. 201. 
Les Spatangoides, Agassiz & Desor , Ann. Sci. Nat. viii. 1847, 5.' 
Body elongate or subcircular, bilateral; jaws none ; mouth 
two-lipped or subangular ; vent posterior ; ambulacra five, sepa- 
rated or united at the summit; the front odd one generally 
placed in a groove, and usually more simple than the two 
other pair; shell generally thin, covered with slender hair- 
like spines, often scattered with longer spines carried on crenu- 
lated perforated tubercles, and ornamented with smoothish 
bands, covered with very fine bristles, similar to the Pedicellaria 
of other Echini; genital pores four, close or distant; ocellar 
spots five. 
Fam. 6. SPATANGIDiE. 
Shell thin, elongate or subcircular, bilateral, with an anterior 
dorsal groove ; covered with crowded, uniform, hair-like spines, 
often armed with larger longer spines placed on perforated 
tubercles, and generally furnished with smoother band-like 
fascioles, which are covered with very short minute spines ; 
cavity simple; ambulacra short, petaloid, converging at the 
summit; mouth two-lipped, transverse; mouth and vent co- 
vered with small unequal scales ; anus posterior, marginal ; 
ovarial pores four, often close ; ocellar pores five. 
Spatangidae, Gray, Ann. Phil. 1825. 
Spatangus, Lamk. Hist.; Blainv. D. S. N. lx. 182. 
Des Spatangoides, premike groupe, Agassiz Desor , Ann. Sci. 
Nat. 1847, viii. 6. 
Campana, Van Phelsum. 
The species, like Spatangus purpures, which have very dis- 
tinct larger spines, are allied to Cidaridce, by the tubercles of 
the larger spines being perforated. 
The whole family is allied to Holothuridce by the thin texture 
of the crustaceous covering, and by the mouth being destitute 
of jaws and surrounded by branched appendages, Gray, Ann. 
Phil. 1825. 
The crustaceous covering of the body of these animals is 
