102 



said " many of the plaut-like figures in marble and agate." 

 When recent, tlie cells look in a reflected light like minute 

 pearls, and may then easily be removed from the shell to 

 which they are attached. 



SMALLER-BEADED CORALLINE. H. Lanceolata. 

 Cells small, slender, and ovoid; aperture round, very 

 small, and nearly terminal. PI. xviii., fig. 6. 

 Ilippothoa lanceolata, Johnston's Brit. Zooph., p. 265. 

 Hab. On the Pinna ingens off the Deadraan point, com- 

 mon. 7?. Q. C. 



A very similar species to the last, but much more 

 delicate. The cells are very minute, pearly, translucent, 

 ovoid', and not so much bulged distally as in the last. The 

 mouth, which is scarcely visible even under a pocket lens, is 

 round, with a raised margin, and nearly terminal. The cells 

 are distant, and connected with each other by a very slender 

 white thread of about twice the length of the cell. It is 

 much and irregularly ramified, each branch is given off at 

 the side and about the middle of a cell. This species retains 

 its pearly lustre even when preserved in cabinets. It is so 

 minute, that it would entirely escape observation if it was 

 not especially looked for, or if the surface was not examined 

 attentively with a lens. It is as common as the last species, 

 and found on the south coast, wherever the Pinna occurs. 

 HIPPOTHOA SICA. Encrusting; calcareous; cells spear 

 shaped; large end placed distally; apertures small sub- 

 terminal. PI. xix., fig. 9. 



Hab. On stones from deep water, common. Polperro, 

 Goran. 



This species of Hippothoa differs so decisively from the 

 two described above, that there can be no doubt of its being 

 specifically distinct. The cells are calcareous, enlarged, and 

 rounded at the distal, and pointed at the proximal end. 

 Their direction is linear; they are attached to each other 

 at their extremities, and their length is about four times 

 their transverse diameter. This species is more sparingly 

 branched than the others. Tiie branches arise at right 

 angles to the cells, from the sides of the apertures. The 

 apertures are rather small, and, as usually seen, are round, 

 even, and unarmed, but, in recent and living 8[)ccimens, they 

 are long and tubular : frequently as long as the cell. In 

 this stale it may be taken for a species of Tubulipora, 



ANGUINARIA. Laniark. 

 Generic Character: Polypidom calcareous, creeping, adnatc, 

 slender, fistular; the cells scattered, erect, free, spathulate, 

 with a lateral aperture near the apex. Polypes ascidian. 



