482 RADIATA. FISTULID^. Holothukia- 



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 pi-ominent 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. pustulatus. — 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. ornalus.—List. An. Ang. 224. t. vii. f. 28 — Oolite. 



FISTULIML 



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. 

 Mulleria. 



Gen. VI. HOLOTHURIA.— Tentacula deeply subdivided. 



10. H. pentactes. — Tentacula ten, with the mouth destitute 



of a fringed margin. 



Hydra corallifera, tentaculis retractilibus frondosis, Gaertner, 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. pentactes of Zool. Dan. tab. cviii., which is of 

 a deep brown colour. 



