ILDICA. i (c 
Hancock,” Cuenvu, Manuel de Conch., p. 416, f. 83087.—Runcina 
viridis F. & H., Hist. Brit. Moll., iii, p. x of index (error). 
The species varies considerable in intensity of color, and some- 
times lacks light rings around the eyes. They are extensile and 
very active. 
Vayssiére found a very minute, delicate, non-calecareous disk be- 
neath the hinder part of the mantle, which may be the vestige of a 
shell. 
R. prasina Morch. PI. 68, figs. 42, 48. 
Body linear, elongated with subparallel sides, the anterior margin 
lightly curved inward ; mantle green, with regularly spaced, close, 
minute warts, the posterior margin three-lobed, the median lobe 
smallest ; dorsal part of mantle elevated, convex, of a deeper color ; 
eyes black, very far apart toward the front. Foot slightly wider 
than mantle, somewhat projecting and broadly rounded behind; 
yellowish-green. Stomach-plates (fig. 43) nearly semi-circular, with 
rather remote, obtuse, strong and arcuate teeth. 
Length about 4 mill. (Méorch). 
St. Croix, West Indies, near Christianstad (CErsted ). 
Pelta prasina Morcn, Journ. de Conchyl., 1863, p. 42.—Brrau, 
Malacol. Unters., iv, 1872, pl. 24, f. 27-29. 
It is narrower than R. coronata, with the mantle trilobate behind 
and the eyes more anterior. Morch’s description and Bergh’s fig. 
ures were from drawings by (Ersted. 
Genus ILDICA Bergh, 1889. 
Iidica Bax., Malac. Untersuchungen, ili, Anhang, p. 869. 
Notzum continuous, the mantle-edge projecting somewhat over 
the sides of the body all around. Shell small, posterior, uncovered. 
Branchial plume simple, posterior on the right side of body, pro- 
jecting. Head small, with a small tentacle on each side of the 
mouth. Foot rather broad, tail short. 
Labial armature composed of minute rods. Radula with median 
teeth and hamate laterals. Stomach armed with 4 strong dentic- 
ulate triturating plates. 
Iidica has an external resemblance to Pleurobranchus, on account 
of its extended notzeum. 
