312 PEOCEEDINGS OF THE ACADEMY OF [1888. 



One specimen, from the north shore about a half-mile west of 

 Flatts Village. 



I first mistook this species for the Semperia (ColocJiirus) gemmata 

 of Pourtales (Proc. Amer. Assoc, 1851, p. 11), described from Sul- 

 livan's Island, coast of South Carolina, but the more exact descrip- 

 tions and figures of that species given by Selenka and Lampert 

 convince me that it is quite distinct. Both species are of a greyish- 

 white color, but no mention is made by either of the authors above 

 quoted of the existence in the Carolinian form of the five longitudi- 

 nal brown bands which extend over the entire length of the Bermu- 

 dian species. Apart from this, Semjjeria Bermudensis differs in the 

 disposition of the tentacles, the greater number of Polian vesicles, 

 and the character of the spicular buttons, which are in the greater 

 number of instances strongly knotted. The posterior processes of 

 the calcareous ring appear also to be much more elongated. 



From Semperia (Cueumaria) punctata, described by Ludwig from 

 the Barbados {Arheiten aus clem zoolog. zootom. Instituts in Wurz- 

 burg, ii, 1875, p. 82) the species differs, apart from the general 

 scheme of coloring — tentacles as well as body — in the different dis- 

 position of the tentacles (9 equal in S. punctata, according to Lud- 

 wig), the smaller number of Polian vesicles (5 in iS. punctata^, and 

 in the much greater number of filaments composing the genital bun- 

 dles. The vent does not appear to have been rayed. 



Ludwig states that there are in his species no calcareous eeth 

 aboui the anal aperture, whereas Lampert just as positively asserts 

 that they are present (Semper, Philippiiien, 1885, p. 152). None 

 such were detected in the Bermudian form. 



STICHOPUS. 



Stichopus diaboli, n. sp. (PI. 1.5, Figs. 1, la. lb, 2.) 



Body stout, more or less quadrangular, flattened ventrally, .and 

 bearing two rows of prominent marginal, wart-like, tubercles ; 

 sometimes two additional rows of minor tubercles are noticeable on 

 the lateral margins of the dorsum. Tentacles 20, unequal. Dorsal 

 papillae scattered, not prominent, leaving the surfixce nearly smooth. 

 Pedicels and papillae on ventral surface arranged in three broad 

 bands, which are more or less distinct for the entire length of the 

 body, but most distinct near the extremities ; numerous in each 

 transverse row. 



The body-cavity is largely occupied by the greatly developed, and 

 finely dissected, respiratory apparatus, and by the loops of the 



