400 ECHINODERMATA. 
with a multitude of feet; the superior is convex, even supported by 
osseous scales, and perforated anteriorly by a stellate orifice, or the 
mouth, from which proceed the tentacula, and posteriorly by around 
hole, which is the anus. 
H. squamata, Miill., Zool. Dan., X, 1, 2,3. A small species 
inhabiting European seas; those of hot climates produce larger 
ones *, 
Here, the body is cartilaginous, horizontally flattened, and tren- 
chant at the edges; the mouth and feet are situated on the inferior 
surface, and the anus is placed at the posterior extremity. 
H. regalis, Cuv.; Pudendwm reqale, Fab., Colum., Aquat., 
XXVI.,1. More than a foot in length, and from three to four 
inches wide; crenulated all round. From the Mediterranean. 
There, the body is cylindrical, and susceptible of being inflated in 
every direction by the absorption of water; the whole of the inferior 
surface is furnished with feet, and the remainder variously roughened. 
H. tremula, Gm.; Bohatsch., Anim. Mar., VI., VII. Black- 
ish, and when completely extended, more than a foot long; its 
back is bristled with soft and conical points, and its mouth pro- 
vided with twenty ramous tentacula. This species is very 
common in European seas, the Mediterranean particularly f. 
There are some whose feet are arranged in five series that extend 
from the mouth to the anus like the ribs of a melon, whence their 
vulgar name of Sea Cucumbers. Such is 
H. frondosa, L.; Gunner., Stockh. Mem., 1767, pl. iv., fig. 1, 
2; Pentacta, Abildg., Zool. Dan., CVIII., I, 2, and CXXIV. 
More than a foot in length, with a brown body. The European 
seas f. 
Finally, there are some in which the body is equally furnished 
with feet all round §. 
* Those which Péron calls the CUVIERIES. 
+ Add Holothuria elegans, MUll., Zool. Dan., I and II. which is the Hol. tremula 
of Gunner, Stockh. Mem., 1767, pl. iv, f. 3, of the 12th edition. These authors, 
however, do not describe it as being furnished with feet underneath ;—Fleurilarde, 
Diquemare, Journ. de Phys., 1778, Octob., pl. 1, f. 1. 
t+ The other figures quoted under Hol. pentactes, viz. Zool., Dan., XXXI, 8; the 
Echinus coriaceus, Plane., Conch., Min. Not. App. VI, D, E; Cucumis marinus, Ron- 
del., Insect., et Zooph., 131, are probably different species. The Fleurilarde, Di- 
quem., even belongs to another section of the genus. 
Add Hol. inherens, Zool., Dan., XXXI, 1—7 ;—Hol. pellucida, Ib., CXXXV, 1; 
—Hol. laevis, Fab., Groenl., No. 345 ;—Hol. minuta, Ib., No. 346. Perhaps the Hol. 
doliolum, Pall., Misc. Zool., pl. xi, f. 10. 
§ Hol. papillosa, Zool. Dan., CVIII, 5 ;—AHol. fusus, Ib., X, 5, 6;—Hol. impa- 
tiens, Forsk., le., XXXIX, B? Eg. Echin., IX, 6. 
N.B. It is impossible to class the Hol. vittata, Forsk., XXXVIII, E, and the Hol. 
reciprocans, Ib., A, for want of sufficient descriptions. The last is improperly quoted 
under inherens by Gmelin ;—the Hol. maculata, Chamiss., Act. Nat. Cur., X, 1, xxv, 
which closely approaches it, should be particularly examined on account of its exces- 
sive length;—the Hol. thalia, caudata, denulata, and zonaria are Biphore ;—the Hol. 
physalus is the genus PHysALuS ;—the Hol. spirans, the genus VELELLA ;—the Hol. 
nuda, the genus PorpirA;—the Hol. priapus, the genus PRIAPULA. JI suspect the 
Hol. forcipata, Fab., Groén., No. 349, to be a mutilated Thalassema. 
