338 ECHINODERMATA. 
Nuc teouites, Lam. 
The same characters, with the anus near the margin, but above. 
The species known are all fossil(1). Others again, 
Gaerites, Lam.—Convutus, Kl. 
Have a flat base, from which their body rises in a cone or semi- 
ellipsoid. The mouth is in the middle of the base, and the anus 
near its margin. 
They are very common in the stony strata, but no living ones are 
known. 
The most common species is the Ech. vulgaris, L.; Encyc., 
153, 6, 73 Klein, Fr. edit., VII, D. G.(2) 
The number of bands in some is not quinary(3). 
SouTELLA, Lam. 
‘ 
Where the anus is betweeen the mouth and the margin, the shell 
extremely depressed, flat underneath, and approaching to an orbicu- 
lar form. 
In some the shell is entire without any other openings than the 
series of pores visible in all the Echini(4). 
The shell is also without large orifices in others, but is bi-emar- 
ginated(5). 
In some again it is entire and traversed by large holes which do 
not penetrate into its cavity(6). 
153, 19, 20;—Ech. semilunaris, Seb., Ill, x, 7; Encyc., 153, 21,22;—Ech. scutifor- 
mis, Scill., Corp. Mar., XI, No. ii, fig, 1, 2. 
Round species: E, Encyc., 153, 1, 2;—Ech. depressus, Walck., I, E, ii, 6, 7; 
Encyc., 152, 7, 8; —Ech. subuculus, Kl., XIV, L—O; Encyc., 153, 14, 17. 
(1) Spatangus, depressus, Leske, ap. Klein, LI, fig., 1, 2; Encyc., 157, 5, 6 
(2) Add Ech. albo-galerus, L.; Bourgs, Fetrif., LUM, 361; Encyc., 152, 5, 6. 
(3) Ech. quadrifasciatus, Walch., Monum., Dil. Supplem., IX, d, 3, and IX, g, 
7—9; Encyc., 153, f. 10, 11; Eth. sexfasciatus, Walch., Supplem., IX, g, 4, a 
Encyc., 153, f. 12 and 13. 
(4) Ech., Encyce. 146, 4, 5 
(5) Echinus auritus, Seb., Il, xv, 1, 2; Encyc., 151, 5, 6;—Ech. inauritus, Seb., 
Ill, xv, 3, 4; Encyc., 152, 1, 2. 
(6) Echinus hexaporus, Seb., Ill, xv, 7, 8; Encyc., 149, 1, 2;—Ech. pentaporus, 
Kl., Fr. Ed., XI, C; Encyc., 149, 3, 4;—ch. biforis, Encyc., 149, 7, 8;—Ech. 
emarginatus, Encyc., 150, 1, 2. 
