278 ZOOPHYTOLOGY. 



Dr. Johnston has accurately described the walls of the 

 cells as " thin, glassy, and hyaline, thickly dotted with 

 small perforated granules." In fresh specimens there is a 

 silvery sheen over the surface of the polyzoary. The avicu- 

 larium is placed within the projecting, spout-like sinus, into 

 which the peristome is prolonged below, and behind it 

 is a single denticle. The mandible of the avicularium is 

 rounded. 



The ovicell is globose and punctured, and the sides of the 

 opening uniting with the peristome give a hooded appear- 

 ance to the cells on which it is developed. 



My finest specimens of this Lepralia were dredged off the 

 Great Orme's Head on the coast of North Wales, and were 

 some compensation for the general barrenness of the ground. 

 It occurred here in great abundance, commonly encrusting 

 masses of the sand-tubes belonging to a species of Sabella. 

 Over these it spread luxuriantly in large, sub-circular, and 

 glistening patches, occasionally rising into foliaceous expan- 

 sions. I have also met with it in Devonshire, and amongst 

 Mr. Hyndman's dredgings from the coast of Antrim.* 



Fam. 2. Cellepokid^e. 

 Gen. 1. Cellepora. 



1. C. armata, n. sp., Hincks. PI. XXX, fig. 5. 



Polyzoary adnate, spreading; cells smooth, sub-erect (except towards 

 the margin of the polyzoary), ventricose, distinct; orifice orbicular, slightly 

 produced below, peristome thin and raised ; a stout rostrum in front, 

 with an avicularium at one side, immediately below the apex, mandible 

 acute and pointing upward; large spoon-shaped avicularia distributed over 

 the polyzoary, in the intercellular spaces. Ovicell smooth ; walls entire. 



In this species, the avicularium is placed at the top of the 

 rostrum, looking to one side. The broad triangular mandible 

 points upward. The rostrum is much stouter and more 

 obtuse than in C. pumicosa. 



Localities. — Coast, of Antrim, on shell, Mr. Hyvdman ; Dogger Bank 

 and South Devon, T. H. ; Madeira, /. Y. J., I860. 



2. C. avictdaris, n. sp., Hincks. 



A Cellepora occurs in considerable plenty on Zoophytes 

 from Ireland, which seems to be undescribed. 

 The folloAving are its characters : 



Polyzoary encrusting or spreading, variable in its mode of growth; 

 cells ovate, ventricose, smooth ; orilice orbicular, with a deep sinus in 



/ "/' luii'irt df !'.r]|'; t .-,t Dredging Committee, in the British Association 

 volume for 1858, p. 293. 



