302 PRUVOTIA-MACELLOMENIA. 



gion is globose and separated from the rest of the body by a slightly 

 marked groove, which disappears when the animal moves. Move- 

 ment is very slow. There is no caudal sensitive knob ; on the other 

 hand, the cephalic knob shows good differences between this species 

 and P. aglaophenice. Fig. 59 shows the ventral face, with the cir- 

 eumbuccal ridge, against which the fine tactile bristles stand, with, 

 in the middle, the sensitive knob bearing four short, parallel rows of 

 little foliated spicules, one on each side of the base and two on the 

 summit, limiting three little clear spaces. Length of largest speci- 

 mens 22 mill. 



Banyuls, on Sertularlella polyzonias, in 45-70 meters depth. 



Proneomenia soplta Pruvot, Arch. Zool. Exper. et Gener. (2), ix, 

 pp. 721, 732. 764, pi. 30, I 50 ; pi. 31, f. 84.—Rhopalome7iia sopita 

 SiMROTH, in Bronn, p. 230, pl.5, f. 8-12. — Pruvotia sopita Thiele, 

 Zeitsch. Wiss. Zool., Iviii, p. 273. 



Very similar to Rhopalomenia aglaophenice, differing in the ab- 

 sence of a caudal sense- papilla or knob, the suprabuccal papilla 

 with four series of small lanceolate spicules, and the radula absent. 



Genus MACELLOMENIA Slmroth, 1893. 



Macellomenia Simr., in Bronn's Thier. Reich., p. 231. — Panmienia 

 Pruvot in part. 



Body cylindrical, short, somewhat smaller in front, transversely 

 truncated behind. Cloaca terminal. Foot-groove subobsolete, curv- 

 ing into the cloaca. Cuticle lacking papillse, bearing shield-like 

 scales narrowing into spines (pi. 46, fig. 62). A circle of gills pres- 

 ent. Radula with many-pointed teeth (pi. 46, fig. 63, denticle shown 

 at d). Two salivary glands. Two stimulation glands, without 

 stimulating organs. Length four times the breadth. Type M. pal- 

 ifera. 



M. palifera (Pruvot). PI. 46, figs. 60-63. 



Body yellowish-white, very stout, curving in a crescent shape, 8 

 mill, long when extended, and about 1 mill, wide, without real keel 

 but with a median dorsal line formed by the converging spicules ; 

 the cloacal orifice large and transverse, broadly notched in the mid- 

 dle by the termination of the pedal groove, and with 18 yellowish^ 

 ciliated branchial folds (fig. 60). No projecting foot, the foot-groove 

 subobsolete, rather shallow, and marked only by the diflTerence of 

 the spicules : there being on each side a band of long and flattened 



