540 ZOOPHYTA. CELLARIAD^. Tricellaria. 
153. C. reptans. — Cells inversely conical, rounded, project- 
ing, with short spinous processes at the top. 
Creeping Coralline, Ellis, Cor. 37* t. xx. f. 3.— Sertularia rep. Linn. Sjst. 
Syst. i. 1315. — C. rep. Pall. El. 73.— Crisia rep. Lamour. Cor. Flex. 
140. — Common on submarine bodies, especially^F/Ms^m/o/mcm. 
Height upwards of an inch, creeping, dichotomously divided, branches di- 
verging, jointed, with frequent connecting tubular radicles ; the extreme 
branches free ; the lateral projecting summits of the cells have from one to 
four short spines. 
154. C. ciliata. — Cells remote, funnel-shaped, diverging, the 
summit with long hairs. 
Ciliated Coralline, Ellis, Cor. 38. t. xx. f. 5. — Sertularia cil. Linn. Syst. 
i. 1316. — C. cil. Pall. El. 74. — Crisia cil. Lamour. Cor. Flex. 139. — • 
On corallines and fuci, common. 
Height seldom an inch, dichotomously branched, loose ; cells projecting on 
the sides of the branches, mouths oblique, spines unequal. 
Gen. LVIII. TRICELLARIA.— Cells ternate, with a joint 
above and belov> ; mouths ovate, with sessile margins. 
155. T. ternata. — Cells lengthened, rounded at top, with 
spinous processes. 
Cellaria ternata, Sol. Ell. Zooph. 30. — Crisia tern. Lammr. Cor. Flex. 
142. — Scottish coast. 
Height scarcely an inch, dichotomously branched ; the cells enlarge gra- 
dually in breadth towards the top, which is armed with two or three spines ; 
when the outermost one is short, the cell externally has an angulated ap- 
pearance ; at the joints the stem is narrow. This species was sent to Mr 
Ellis from Aberdeen by Dr Skene. My specimens were found in Zetland. 
Gen. LIX. CRISIA. — Cells in two rows; the mouths tu- 
bular, with produced margins. 
156. C. ehurnea. — Cells loosely aggregated, cylindrical, bent, 
tubular orifices free. 
Tufted Ivory Coralline, Ellis, Cor. 39. t. xxi. f. 6 — Sertularia eb. Linn. 
Syst. Nat. i. 1316. — Cellularia eb. Pall. El. 75. — Crisia eb. Lamour. 
Cor. Flex. 158.— -On marine plants about low water-mark. 
Height about half an inch, dichotomously branched, jointed ; surface ha- 
ving a frosted appearance ; cells narrow, long, and bent outwardly, placing 
the mouths far asunder ; ovarium an enlarged cell. 
157. C. luxata. — Cells closely aggregated, cylindrical, nearly 
straight, with short tubular orifices ; joints black. 
On corallines, not rare, from various parts of the coast. 
Height scarcely an inch, of a firmer substance than the preceding, with 
which it has probably been confounded, though differing in the following par- 
ticulars : the branches are broader and thicker in the middle, the cells are 
shorter and more closely connected, the orifices are less tubular and. elevated, 
