CRYPTOPHTHALMUS. 37 
long as the body, its sides produced in large parapodial lobes which 
fold over the back. Gill small, projecting backward from under 
the shell on the right. Male orifice near the foot edge on the right 
side in front. Female orifice in front of the gill, below the tubu- 
lar anal opening. Dentition unknown. Type, C. smaragdinus 
Leuckart. 
C. sMARAGDINUS Leuckart. PI. 6, figs. 29-36. 
The animal is beautiful emerald green mingled with light green 
marking. The shell is 8 mill. long, covering the gills, and covered 
by a delicate mantle-layer. It is fragile, thin, translucent, white. 
The side margins are only slightly curved toward each other, with- 
out whorls or columella. The two broad, thick, free laterai para- 
podial lobes may be reflexed over the back, entirely closing over 
the gill. The free end of the gill, similar to that of Aplysia, may 
project behind the shell. Tentacles wanting. Head shield distinct, 
raised, two-lobed behind. In front, above the mouth, there is on 
each side a small eye, not visible in the specimens preserved in 
spirit. The body on each side of the head shield and within the 
parapodial lobes, has a ‘series of short oblique folds. Ventral sur- 
face more or less convex. Genital openings and anus as in Aplysia. 
Length of body two inches. In alcohol they measure one inch. 
Red Sea at Tor and Suez; Mauritius; Reunion. 
Bulla smaragdina Rurprey & LeucKkart, Neue wirbellose 
Thiere des Rothen Meeres (in Atlas zu der Reise im nordlichen Af- — 
rika von Eduard Rtippell, Erste Abtheil. Zoologie), p. 26, pl. 11, f. 
2 a-d (1828).—Cryptophthalmus olivaceus EHRENBERG, Symbols 
Physics, seu Icones et Descriptiones Animalium Evertebratorum, 
ete., Decas prima, Mollusca, pl. 1, f. Il A.G.—B. ( Crypt.) olivacea 
A. Ap. in Thes. ii, p. 598, pl. 121, f. 56.—Cryptophthalmus smarag- 
dinus MARTENS, in Mobius’ Reise nach Mauritius, p. 3065. 
When contracted, the animal assumes a globular shape (pl. 6, 
fig. 31, anterior view; fig 30, dorsal view). In fig. 56, the lateral 
lobes are separated. 
The nameless species mentioned by von Martens as being near 
the genus Cryptophthalmus, in Beitrige zur Meeresfauna der Insul 
Mauritius u. der Seychellen, p. 348, pl. 21, f. 7, is a Haminea. 
C. cYLINDRIcUs Pease. PI. 2, figs. 36, 37, 38. 
Shell unknown. Animal elongate, cylindrical, smooth, sides 
nearly parallel. Cephalic disk short, about one-fourth the entire 
