48S HADIATA. FISTULIDJE. Holothuiua* 
3. C. subrotundus — Subglobose, divided by biporosous avenues into five 
wide and five narrow compartments ; vent in the margin Mant, Geol. 191. 
t. xvii. f. 15. — In Chalk. 
Gen. ECHINOCORYS. — Oval, vaulted ; mouth transverse, 
lateral, the vent towards the opposite margin. 
1. E. scutatus — A prominent angular ridge, from the vertex to the vent ; ' 
surface finely granular ; height and breadth nearly equal. — Park. Org. 
Rem. iii. 21. t. ii. f. 4.— In Chalk. 
2. E. jmstulatus. — Ovate, conical, narrow. at top, with an angular ridge 
from the vertex to the vent ; avenues biporous from the vertex, the pores 
becoming inclosed in pairs by raised circles near the margin — Echinites punc- 
tis prominentibus, List. An. Ang. 225. — Oolite. 
3. E. omatus. — List. An. Ang. 224. t. vii. f. 28. — Oolite. 
FISTULIDiE 
Covering.^ a flexible skin. 
The body is lengthened. The mouth is terminal, and furnish- 
ed with a circle of (generally) osseous pieces instead of teeth, 
and surrounded by retractile tentacula. Opening of the 
oviduct near the mouth ; anus terminal. This includes the 
species constituting the genus Holothuria of Linnaeus. The 
indigenous species may be placed provisionally under the fol- 
lowing sections : 
I. Suckers arranged in five longitudinal rows, from the mouth to the vent. 
Holothuria. 
II. Suckers confined to one part of the body, forming a ventral disc. 
Cuvieria. 
III. Suckers distributed over the surface of the body. 
MuUeria. 
Gen. VI. HOLOTHURIA. — Tentacula deeply subdivided, 
10. H. pentactes . — Tentacula ten, with the mouth destitute 
of a fringed margin. 
Hydra corallifera, tentaculis retractilibus frondosis, Gaeriner, Ph. Tr. 
1761, p. 80. tab. i. b. f. 3. A, B. — H. pen. Penn. Br. Zool. iv. 51. 
tab. xxvi.— Inhabits deep water on different parts of the coast. 
The body is dusky-white, head dark brown ; tentacula dark brown, covered 
with pale yellow papillae. This species, in these characters, differs from the 
H. frondosa of Gunner, the H. pentaates of Zool, Dan. tab. Qviii., which is of 
a deep brown colour. 
