CRETACEOUS ECHINODERMATA. 34i 
(Subgenus DiscorpEa.) 
1. Galerites (Discoidea) cylindricus, Lamarck. (Tab. XXIX. fig. 3.) 
Chalk marl. 
2. Galerites (Discoidea) subuculus, var. B. 
The little subglobose, white chalk variety. White chalk of Sussex. 
3. Galerites (Discoidea) Dixoni, sp. nov. (Tab. XXIV. figs. 13, 14.) 
In form and size this species resembles Discoidea subuculus ; also in the pro- 
portional number of ambulacral as compared with the interambulacral plates, and 
the granulation of their surfaces. It is distinguished, however, by the proportions 
and dimensions of mouth and anus, as compared with the whole ventral surface. 
The mouth, instead of being (as in subuculus) nearly equal in diameter to the 
distances between its sides and the margin of the inferior surface, is scarcely half 
that size, and the anus, instead of occupying the greater part of the space be- 
tween the mouth and the margin, fills less than half of it. 
White chalk of Sussex. 
Genus Anancuytes, Lamarck. 
1. A. ovata, Lamarck. 
var. 1. ovata, Goldf. t. 44. f. 1. 
var. 2. striata, Lamk. 
A. conoideus, Goldf. t. 44. f. 2. 
var. 3. gibba, Lamk. 
A. striata, Goldf. t. 44. f. 3. 
White chalk of Sussex, &c. 
Genus Hotaster, Agassiz. 
1. Holaster subglobosus, (sp.) Leske. (Tab. XXIX. fig. 1; and, variety, 
Tab. XXIV. fig. 2.) 
Chalk-marl. 
2. Holaster planus, Mantell (Geol. Suss. pl. 17. f. 9-21). 
Chalk-marl. 
3. Holaster pillula, Lamarck. (Tab. XXIV. fig. 10-12). 
White chalk of Sussex. 
