192 
THE VOYAGE OF H.M.S. CHALLENGEE. 
Habitat. — Patagonia (Ludwig). 
The species is not well known, its dorsal appendages being unsatisfactorily described. 
It is distinguished, however, by the numerous teeth on the top of the spire and 
by the fact that the pedicels in the odd ambulacrum form two series. 
Stichopus mobii, Semper, 1868. 
Tentacles eighteen. Dorsal surface without tubercles, hut with irregularly disposed 
papHlse. Spire of the tables terminating in four dentate points. Incomplete 
rosettes present. 
Habitat. — ^West Indies (Semper). 
(Mus. Holm.) One very large specimen from West Indies, about 250 mm. long. In 
external appearance it closely resembles the specimens of Stichopus variegatus from 
the Pacific Ocean which I have seen, and it possesses even the minute blackish 
points I observed in several forms of that species. Tentacles twenty, not eighteen, 
but I suppose the species to be capable of some variations in this respect. The 
middle series of pedicels is much broader than the lateral, and contains six to 
eight pedicels in its breadth. The dorsal papHlse are small, scattered aU over the 
back, and placed on the top of warts, which are very low excepting round the 
sides of the body, where they are more prominent and resemble rounded pro- 
tuberances. The tables terminate in about fifteen or eighteen spines. I cannot 
refrain from offering the opinion that the species in question is possibly identical 
with Stichopus variegatus, and there seem to be good grounds in support of this 
supposition. According to Ludwig, even Stichopus errans is very nearly related 
to it. To decide this point, it will be necessary to know to what degree the 
variation in the number of tentacles and in the arrangement of the ambulacral 
appendages is possible. The species examined by me evidently hears greater 
resemblance to Stichopus variegatus than to Stichopus mobii. 
Stichopus naso, Semper, 1868. 
Tentacles eighteen. Dorsal surface with very large conical processes, upon and 
between which the papillae are situated. Body-wall exceedingly thick. The 
lateral series of pedicels become rudimentary anteriorly. Body distinctly quad- 
rangular, narrower anteriorly. 
Spire of the tables terminating in about twelve teeth. Incomplete rosettes present. 
Habitat. — Philippine Islands (Semper, Ludwig). 
c. Deposits — 0-shaped bodies ; and tables consisting of a cruciform 
four-armed disk, with the ends of the straight arms enlarged and 
pierced with a few holes ; the spire is long, made up of four rows 
connected by three, four, or more transverse beams, each rod 
terminating in a simple point and carrying some spines. 
