ZOOPHYTOLOGY. 179 



mouth of the cell beneath, give it the appearance of being 

 furnished with several oval spines. 



Gen. 3. Cellepora, 0. Fabricius. 



1. C. papillcpformis, n. sp., Busk, 1. c, p. 5. PI. VIII., fig. 5. 

 Cells sub-hexagonal, raised, surface punctate ; mouth suborbicular, with 



a tooth on each side, margin simple, thin ; scattered aviciilaria, with a 

 triangular mandible. 



Hab. Mazatlan : on Imp. oUvaceus. 



A well-marked and distinct form belonging to that sub- 

 division of Cellepora in which the mouth is not armed with a 

 projecting avicularium. The top of each cell projects in the 

 form of a rounded mamillary eminence from a hexagonal 

 area, which defines the border of the cell. The cells are ot 

 very unequal size, and very irregularly disposed. It is of a 

 brownish colour. 



2. C. cyclostoma, n. sp.. Busk, 1. c, p. 5. PI. VIII., fig. 3. o, h, c. 

 Cells suberect or decumbent, discrete ; surface punctate ; mouth large, 



rounded above, with a wide simis in the lower lip ; the margin in the 

 older cells much raised, thickeued, occasionally dilated, infundibuliform, 

 and furnished with a minute avicularium on each side. 

 Hab. Mazatlan : on Imp. unfjids. 



The wide, rounded, or elliptical, raised margin of the 

 mouths of the distant cells, gives the polyzoarium of the 

 present species a very peculiar and well-marked aspect. It is 

 of a brownish hue or white. 



Sub-order II. Cyclostomata. 

 Fam. DiscopORAD^, Busk, MS. 

 Gen. Defrancia, Brown. 

 1. D. intricata, n. s., Busk, 1, c, p. 6. 

 Disc very irregular m form, rows of cells radiating iiTegularly ; orifices 

 of cells and intersticial pores of equal size, 

 Hab. Mazatlan : on Imperator unguis. 



The small irregular patches appear to be constituted by the 

 confluence of several sets of cost(S, with their corresponding 

 interstices, each set radiating from a depressed central point. 

 It differs from D. deformis, Reuss (op. cit. p. 36, Plate 5, fig. 

 24), in the uniform size of the openings of the tubes in the 

 costae, and of the pores in the interstices. 



Besides the above, there occur on some of the shells in the 

 same collection, indications of other species, but in too im- 

 perfect a condition to allow of their determination with any 

 certainty. Among these, perhaps the best marked are a 

 species strongly resembling Cellepora pumicosa, Linn., a species 

 of Lepralia, and a Tuhdipora. 



