340 CRETACEOUS ECHINODERMATA. 
Genus CypHosoma, Agassiz. 
This genus differs from Cidaris in having broad and tuberculiferous ambulacral 
plates, and from Diadema in the tubercles not being perforated. 
1. C. Millert, Desmarest, Agassiz; C. granulosus, Goldfuss ; C. Konigi, Mantell. 
(Tab. XXIX. figs. 17, 26, 27.). White chalk. 
2. C. corollare, Parkinson? White chalk. 
3. C. variolaris, Goldfuss ; ornatissimum and Tiara, Agassiz? (Tab. XXV. fig. 29.) 
White chalk. 
4. C. spatulifera, sp. nov. (Tab. XXIV. fig. 20.) 
This species is remarkable for its extremely flattened spines, smooth except 
near their bases, where they are closely striated. The rows of ambulacral pores 
are only slightly undulated superiorly. The spinigerous tubercles are middle- 
sized, gradually diminishing, and separated by comparatively few miliary 
granules. 
Genus Giypricus, Agassiz. 
1. G. Koninckii, Desor 2? White chalk. (Tab. XXV. fig. 30.) 
Genus Ecuinopsis, Agassiz. 
. E. pusillus, Roemer. (Tab. XXV. fig. 31.) 
—_ 
Genus Satenia, Gray. 
. Salenia scutigera, Agassiz, var.?? (Tab. XXV. fig. 23-25.) 
— 
Genus Gaterites, Lamarck. 
— 
. G. albo-galerus, Lamarck (see Desor, Monog. Gal. tab. 1. fig. 4-11, and 
tab. 13. fig. 7.) 
White chalk of Sussex, &c. 
2. G. vulgaris, Lamarck (see Desor, Monog. Gal. tab. 2. fig. 1-10, and tab. 13. 
fig. 4-6). 
White chalk of Sussex, &c. 
3. G. subrotunda, Agassiz (see Desor, Monog. Gal. tab. 2. fig. 11-14). 
White chalk of Sussex. 
G. globulus, Desor (see Desor, Monog. Gal. tab. 4. fig. 1-4). 
White chalk of Sussex. 
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