1888.] NATURAL SCIENCES OF PHILADELPHIA. 313 



variously branched genital organs, which are disposed in two 

 great bundles. Tentacular vesicles jiresent. Two Polian vesicles. 

 Calcareous ring with long back processes. 



Calcareous bodies in the form of stools very numerous (PI. 15, 

 fig. 16.) C-shaped bodies very scanty, and possibly in some cases 

 entirely wanting. 



Color black, somewhat more intensely so on the dorsal surface, 

 becoming Vandyke brown or chocolate in alcohol. 



Length, about one foot ; width of corresponding animal about 

 three inches. 



Abundant over the sandy floor of the entrance to Harrington 

 Sound, opposite Flatts Village, in Harrington Sound, and in Castle 

 Harbor, whence it was obtained in several of our dredgings. 



I have little doubt that this species is the dark-brown form 

 which is referred to by Theel as having been obtained by the 

 officers of the Challenger at the Bermudas, and which is doubt- 

 fully referred by that authority to Semper's Stichopus Haytlensis 

 (Report on the Holothuroidea, Challenger Re^jorts, Zoology, XIV, 

 p. 162.) But a single specimen appears to have been obtained, 

 which when examined was too deformed to permit of positive spe- 

 cific determination. I cannot agree with Theel's determination. 

 Apart from the differences which Theel himself points out, is the 

 great diffierence in coloring. Semper {Reisen, Philippinen, Holo- 

 thurlen, 1868, p. 75) states that his species is dark chocolate-brown, 

 blotched with yellow spots, which form five longitudinal bands, 

 corresponding to the interradii. No such coloration is visible in our 

 species, although probably -vve observed as many as a hundred indi- 

 viduals, all of which were uniformly black. Semper's description of 

 the coloring of Stichopus Haytiensis is restated by Lampert. 



Stichopus xanthomela, n. sp. (PI. 14, fig. 1 ; PL 15, fig. 3.) 



Body stout, flattened ventrally, and bearing on the basal margin 

 two rows (one row on each side, as in the preceding species) of prom- 

 inent wart-like processes. Tentacles 18, unequal, Avhitish or gray, 

 edged with brown. . Dorsal papilhe fairly prominent, scattered. 

 Pedicels on ventral surface crowded, arranged in three longitudinal 

 series, five to eight, or more, in each transverse row. 



Body-cavity, as in the preceding, largely occupied by the respira- 

 atory tree and the double genital bundle, the filamental processes of 

 the latter much finer than in S. diaboli. Tentacular vesicles present. 

 One (?) Polian vesicle. 



