308 PARAMENIA-ECHINOMENIA. 



It is the most agile of the Neomenians, travelling about among 

 the contents of the dredge, hydroids and bryozoans, without fixing 

 upon any special host. The body is slightly yellowish-white, stout, 

 and squarely truncated at the two extremities (fig. 92). The 

 mouth relatively very large, the foot groove and foot well marked. 

 At the cloaca end, in fully adult individuals, there are two long, 

 slender bunches of straight penial spicules (fig, 92). The general 

 covering of the body is characterized by the great number and large 

 size of the spicules, which give it a particularly bristling appear- 

 ance. Mainly acicular, and of the type represented by fig. 87, 

 there are scattered, especially toward the tail, spicules of a barbed 

 hook shape. The dorsal sensory knob is terminal, bristling with 

 very numerous tactile hairs, and encircled by a regular, circular 

 palisade of little lanceolate spicules (fig. 89). At the oral extrem- 

 ity there is another sensory knob in the middle of the buccal bor- 

 der, also showing a complete basal corona of little lanceolate spic- 

 ules and an apical tuft of similar ones (fig. 88). 



Banyuls, on sandy bottom with hydroids, 80 meters. 



Proneomenia vagans Pruvot, Arch. Zool. Exper. (2), ix, p. 723, 

 pi. 25, f. 7, and pi. 31, f. 86, 87. Not of Kow. & Msir.—Parame)na 

 {Pararrhopalia) pruvoti Simroth, I. c, p. 232, pi. 6, figs. 12-17. 



Genus ECHINOMENIA Simroth, 1893. 

 Echinomenia Simroth, Bronn's Thier- Reich, iii, p. 233. 



Body elongated, vermiform, equal in breadth throughout its 

 length, laterally compressed. Cloaca opening ventral. Foot and 

 foot-groove present, curving into the cloaca ; spicules are curved 

 needles, truncated below, erectile ; no gills. Radula biserial (?). 

 Length 18 times the greatest diameter; height 3 times the width. 



Differs from Lepldomenia in its compressed, elongated form, and 

 the erectile spicules. 



E. coRALLioPHiLA (Kowalevski). PI. 48, figs. 94-98. 



Animal 14-18 mill, long, living on red coral (Coralliumruhrum) 

 among the polyp bearing branches of which it crawls rapidly ; sides 

 and back covered with movable scales, which cause the color of the 

 animal to change by their erection or depression, so that it may ap- 

 pear either whitish as the tentacles of the expanded polyp, or red 

 like the stem. The naked ventral surface forms a creeping sole. 

 Besides the scales, there is a bunch of straight spicules on the pos- 



