24 
CATALOGUE OF ECHINIDA. 
3. Mellita nummularia. 
Small, very flat ; lunules rounded. 
Mellita nummularia, Agassiz <k Desor , 1. c. 139. 
Hab. Mus. Paris. 
10. Echinoglycus. 
Shell nearly circular, truncated behind, with six lunules, or 
slits, on the edge, one at the end of each ambulacra, and one 
on the odd posterior inter-ambulacral area ; ambulacral petals 
closed ; the marginal tesserse of the ambulacral bands short, 
broad, transverse, band-like ; larger dorsal spines with ovate 
heads ; inferior ambulacral grooves much branched ; mouth 
central, round ; jaws flat ; anus inferior, nearer the mouth 
than the hinder edge, covered with large flat plates behind, 
and the aperture in front covered with small imbricate scales ; 
ovarial pores five, at the end of the rays of the large star- 
shaped central madreporiform body. 
Encope, Agassiz , Mon. Scutelles , 45, 146 ; Agassiz A Desor, Ann. 
Sci. Nat. 1847, 137. 
Scutella, § 1, Desmoul. Tab. Syn. 222. 
Scutella, § 1, a, Escksch. Zool. Atlas, 19. 
Echinodiscus, sp., Leske a,p. Klein, 244. 
Echinoglycus, sp., Van Phelsum, 34. 
* Posterior central perforation elongate between the hinder ambu- 
lacra. 
t Margin of shell thin, 
1. Echinoglycus frondosus. 
Madreporiform body large, with long tapering rays ; central 
hinder slit large, elongate ; slit elongate, often converted into 
perforations by the union of the converging outer margins. 
Echinodiscus emarginatus, Leske, n. 53, 200, t. 50, f. 5, 6. 
Echinus emarginatus, Gmelin, JS. N. 3189. 
Grand Oursin de mer-etoile, Klein, Gall. Supp. 231, 232, t. 25, 
f. a. t. 26, f. B. 
Echinoglycus frondosus, Van Phelsum , 34. 
Scutella emarginata, Lamk. H. iii. 279 ; E. M. t. 150, f. 1, 2 ; 
Deslong. Ency. Meth. ii. 675 ; Blainv. D. S. N. xlviii. 224, 
lx. 201 ; Zoo'ph . 201; Agass. Prod. Echin. 188; Desmoul, 
Tab. Syn. 222. 
Yar. 1. Outer edge of slits nearly all united. 
Encope emarginatus, Agassiz , Mon, Scutelles , ii. 47, 146, t. 10, 
146 ; Agassiz & Desor , 1. c, 137, 
