ECHINODERMATA. 155 
Lichinolampas Gray, Acass. Ambulacra circumscript, very wide 
at the summit, narrower towards the margin, not conjoined. Dise 
submarginate forwards. Genital pores four. 
Sp. Clypeaster eccentricus, Echinolampas Kleinii Bronn Leth. géogn. Tab. 
XXXVI. fig. ro: fossil from the tertiary formations, &e. 
Seutella Lam. Body flattened, with margin thin, sub-acute. 
Ambulacra short, cireumscript, resembling a pentapetalous flower. 
Anus inferior between the mouth and the margin. Genital pores 
four or five. 
From this genus Acassiz at first separated the sub-genus Lchin- 
arachnius (Prodrome d’une Monogr. des Radiares, &e.,) afterwards 
he divided the genus Scwtella of Lamarck into thirteen genera 
(Monogr. @Echinod., 2e Livrais. les Seutelles) ; Rotula Kut, 
Aeass., Runa Acass., Mellita Kurt, Lncope Acass., Lobophora 
Acass., Amphiope Acass., Scutella Acass., Echinarachnius V. 
Puets., Arachnoides Kix, Scutellina Acass., Laganum Kxux1, 
Lchinocyamus V. Purts., Voulinia Acass. 
Sp. Seutella seaforis Lam., Mellita heeapora Aaass., Guérin Iconogr. Zooph. 
Pl. 3, fig. 4, Cuv. R. And. éd. ill, Zooph. Pl. 15, fig. 1. AGASS. Monogr. 
Livr. 2, Pl. 1v. fig. 4—7, Pl. rv’. fig. 11, 12; from the shores of the Mo- 
lucca Islands, &e.—Seutella dentata Lam., Rotula Rumphii Kuni, AGASS., 
Rumpus. Amb. Rariteith, Tab. xrv. fig. 1, &. (LINNaUS comprehended all 
the species known to him under the name of Echinus orbicularis). Except 
a very small number from the chalk-formation, all the fossil species of this 
genus are from the tertiary formations. 
** Anus superior central, opposite to the mouth. Test regular. 
Ambulacra, perfect. Glenital pores, five. (Cidaridea Gray, AGASS.) 
Lichinus Lam. (spec. of genus Echinus L.) Ambulacra wider 
towards the middle of the test, divergent, contracted at the summit 
and towards the mouth. Spines placed upon imperforate tubercles, 
sometimes very long. 
Sp. Lchinus lividus Lam. (Echin. sexatilis Trepem, 1. 1.), VALENTIN in Acass. 
Monogr. d’Echinod., Liv. 4, Pl. 1, Baster Natuurh. tsp. 1. Tab. xt. 
fig. 1—8, Forses Brit. Starf. p- 167. In the Mediterranean and North 
Sea, &c. For the synonomy of the European species of Echinus comp. 
AGASSIZ in the preface to the fourth number of his M onographies, 
Arbacia Gray, Acass., Echinometra Bren, Gray, Acass. 
Sp. Achinus mamillatus L., Echinometra mamillata. Rumpu. Amb. Rariteith. 
Tab. x1. fig. 1, 2, Cuv. R. Ani. édit. ilustr., Zooph. Pl, xurt. fig. 1, East 
Indian Sea, &e. 
Salenia Gray, Acass. (Goniopygus, Peltaster, Goniophorus AGass.) 
Comp. AcAssiz, Monogr. d’Echinod. Livr. 1. 
