CELLEPORID.fi I LEPRALIA. 311 



the walls thin and granulous ; the aperture small, circular, with an 

 arched sinus on the upper lip. Ovarian capsules globose, roughish, 

 with a large round opening on the posterior side. 



Mr. Hassall says that the " crust is generally reddish, even when 

 dried," but the few specimens I have seen are either white or cream- 

 coloured. He also introduces into the specific character " two slender 

 divergent teeth " on the aperture ; but afterwards it is said that 

 these are "seldom present." 1 find the aperture almost always un- 

 armed j yet in a very few cells of one specimen there are two short 

 spines on the lower lip ; and in one cell there are three spines. The 

 species is allied to L. trispinosa, but very distinct. The cells are 

 sometimes almost ovate, with the septa less obvious than in typical 

 specimens. 



* * * Wall of the cells punctured. 



15. L. PERTUSA, cells ovato-ventricose, punctured, distinct, 

 with a somewhat contracted circular aperture, the margin of 

 which is plain and even. W. Thompson. 



PLATE LIV. FIG. 10. 



CeUepora pertusa, Esper Pflanz. Cellep. p. 149. tab. x. fig. 2. Escharina pertusa, 

 M. Edicards in Lam. Anim. s. vert. 2de edit. ii. 232. Cellepora perlacea, W. 

 Thompson in Ann. and Mag. N. Hist. x. 20. Escharina perlacea, M. Edwards in 

 Lam. Anim. s. vert. 2de edit. ii. 234, 



Hob. On rocks and old shells, not common. On a species of 

 Lima from the Isle of Man, E. Forbes. Coast of Cornwall, C. W. 

 Peach. On Limae dredged off Sana Island by G. C. Hyndman. 



Cells forming a brown, or cream-coloured, or whitish crust, ar- 

 ranged as usual, ovato-ventricose, often with a glistening lustre, the 

 walls thickly and irregularly punctured, opaque. They are nearly 

 the size of those of Lep. unicornis, but more ovate and ventricose. 

 The aperture is perfectly circular and even. The ovarian capsules 

 are large, globular, and punctured like the cells. 



The crust is thickish, and spreads occasionally to a considerable 

 extent, the outline being uneven. The cells are about the largest of 

 any species in the genus, and fully one-third larger than those of L. 

 punctata or L. anuulata. 



In small and very perfect specimens the wall of the cells, instead 

 of being punctured, appears to be granulated, and the little granules 

 are each of them surrounded by a paler halo. On such a specimen 

 is founded the Cellepora perlacea of Delia Chiaje. 



