540 ZOOPHYTES. 



than the others. In this particular they agree with the Helioporce. 

 They constitute a part of the genus Ceriopora of Goldfuss. The 

 species so called by Lonsdale in Murchison's Silurian System, pi. 15, 

 fig. 14, appears to have the internal characters of this genus, except 

 that the tubes are separable, nearly as in the Favosites. 



The name Heliopora alludes to the circular cells, and is derived 

 from yjXios, sun. 



HELIOPORA C^RULEA. (Pallas.} Blainvilk. 



H. glomerato-laminata, laminis erectis, varie lobatis aut digitalis, lobis 

 interdum brevissimis ; apice 1^-2'" crassis, basi scepe 9'" super antibus ; 

 colore interna cyaned. 



Glomerato-laminate, laminae erect, variously lobed or digitate, lobes 

 sometimes very short; summits 1| to 2 lines thick, at base often 

 over f of an inch ; internal colour blue. 



East Indies. Balabac Passage, North of Borneo. Exp. Exp. 



This species grows in spreading clumps, a foot or more across, con- 

 sisting of an aggregate of erect plates, irregularly clustered, and un- 

 equally lobed or subdivided above. The plates are often several 

 inches in height. The cells are hardly a fourth of a line in breadth, 

 and the interstices are finely grariulous, with rounded pores at the 

 base of the granules. 



|8. tuberosa (plate 52, fig. 2). This name is applied to a tuberose 

 specimen three inches long, which had no point of attachment, and is 

 covered on all sides with smooth rounded tubercles a third to half an 

 inch in size. 



y. meandrina. This singular Heliopora is represented in figure 1, 

 plate 52. It consists of erect meandering plates, of an even height 

 and separated by uniform intervals. The plates are one-third to half 

 an inch thick at top, and the same below. The whole clump is about 

 six inches high and eight broad. If identical with the ccerulea, the 

 form might have resulted from its having grown near the surface of 

 the water, in consequence of which all the plates became of the same 

 height. It may, however, be distinct, although similar in the character 

 of the surface ; and the specimen probably came from the West Indies. 

 Ellis has figured a fragment from the West Indies, on plate 12, fig. 2, 



