164 OXYNOE. 
QO. brachycephalus Morch was based on the figures of H. & A. 
Adams (copied by Chenu, and on my plate 11, figs. 56, 57). Its 
differential characters are: warts on the body remote; neck very 
short; shell contracted at summit. 
O. sieboldi Krohn (see pl. 11, figs. 58-62) is considered distinct by 
Morch on account of the presence of a red and dark dotted border 
along foot and pleuropodia. This border is less distinct or perhaps 
lacking in the olivacea, to which he refers Souleyet’s figures (see pl. 
11, f. 43, 44, 46-50). Monterosato is doubtless right, however, in 
considering all of these forms identical. 
Pagenstecher thus describes the coloring of his specimens from 
Balearic Is., where they were found in 15-30 feet of water. 
Length 2°5 to 5 em., including the tentacles. Ground-color is 
clear olive-green with numerous white and light-brown or light-yellow 
flecks, which are frequently raised into granules, or stronger warts, 
or even sub-divided papille. The two large, non-retractile, laterally 
rolled tentacles and the margin of the narrow foot are marbled with 
yellowish- and gray-brown; sole pale yellow. Dorsal surface of the 
tail-like posterior part of the body is sharply carinated, and in places 
it is brownish, to the suppression of the green ground-color, with 
dark dots in addition to the light papille. Enrolled surface of ten- 
tacles pale yellow. Free margin of the reflexed lateral lobes 
marbled with brown; while the green color is strongest and purest 
on the neck. 
O. anTILLARUM Morch. PI. 53, fig. 90. 
Body green, oval; tail very long, narrow, with a wide longitudinal 
white dorsal band ; closely dotted with green ; tentacles and sides of 
the head white, with rather remote green dots arranged in series. 
Epipodial lobes with acute, conic, close warts, its edge white with 
irregular green dots. Sole of the foot yellowish, narrow, the mar- 
gin with a row of regular close green dots (Mérch, from a drawing 
by Cirsted). 
Shell involute, ovate, hyaline-white, swollen above, very slightly 
contracted immediately below the vertex, shining, with some irregu- 
lar wrinkles of growth. Spire concealed. Suture a deep lunate in- 
cision. Aperture very large, broadly ovate below, narrow above ; 
outer lip sinuous, produced forward above. 
Alt. 6-64, diam. 43 mill. 
St. Thomas (CErsted). 
