428 Mr, Grail/ on the Sea Eggs, .[Dec. 



ambulacra in pairs, rounded ; mouth central ; anus between the 

 margin and the mouth. 



L. minor. Echinodiscus la^anum, Leske, t. 22, f. a, b, c. 

 L. scutiformis, Selm, iii. t. 15, f. 23, 24; see Scutella, n. 15, 16, 

 Lawi.? 



**Echinodiscus, Bryerins, Scutella, Lam, 

 EcHiNARACHNius,LesA:e. Arachnoides, Klein, 

 Body flattened, outline orbicular, or subangular, above rather 



convex, edge thin; ambulacra in pairs, like a flower; mouth 



central ; anus marginal. 



E. placenta. Scutella, Lam. Klein, t. 20, f. A B. E. parma, 



Scutella, Lam, E. lenticularis, Scutella, Lam, 



EcHiNODiscus, Leske. Mellita and Rotula, Klein. 



Body flattened, outline orbicular, above rather convex, edges 

 thin ; ambulacra in pairs, like a flower ; mouth central ; anus 

 between the margin and the mouth. Jaws, Klein, t. 33, f. r, s. 



^Entire. E. orbicularis. Echinus, Gmelin. Leske, t. 45, f. 

 6, 7. E. fibularis, Scutella, Lam. **Lobed. E. inauritus, 

 Seba, iii. t. 15, f. 3, 4. E. auritus, Seha, iii. t. 15, f. 1, 2. 

 E. dentata, Klein, t. 22, f. E F. ***Perforated. E. bif'ora, 

 Klein, t. 21, f. A B. E. digifata, Klein, t. 22, f. A B. E. octo- 

 dactylus, Klein, t. 22, f. C D, &c. 



EcHiNOCYAMUs, Leske. Fibularia, Lam, 



Body subglobular; outhne ovate, or orbicular, edge rounded; 

 inside with columns ; ambulacra in pairs, short, hke a flower ; 

 mouth central ; anus between the mouth and edge. 



E. ovulum, Fibularia, Lam. E. pusillus, Spatangus, Muller, 

 Zool. Dan. iii. t. 91, f. 5, 6. E. tarentina, Lam. E. trigona. 

 Fibularia, Lam. 



#*# 



Cassidulus, Lam, 



Body elliptical ; outline ovate, above rather convex ; ambu- 

 lacra 5 stellate ; mouth central ; anus between the vertex and 

 the margin. 



C. complanatus. Lam. C. scutella, Lam. 



C. lapis Cancri by its figure appears to be allied to the genus 

 Echinolampas, and will, perhaps, form anew genus. 



Fam.4. Galeritid^. 



Body ovate or conical, covered with numerous small, equal, 

 sunk tubercles ; spines short, small, equal ; ambulacra complete, 

 forming bands (rarely interrupted at the edge) from the mouth to 



the vertex ; mouth mostly central ; jaws ?; internal cavity 



hollow, destitute of vertical pillars ; ovarian pores 4 ; corpus 

 spongiosum vertical, in the centre of the ovarial perforations ; 



