164 OXYNOE. 



0. 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. 



0. sieboldi Krohn (see pi. 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 pi. 

 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 cm., 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 papillae. 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 papillae. 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 Mo'rch. PL 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 (Morch, from a drawing 

 by (Ersted~). 



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. 6-6i, diam. 4 mill. 



St. Thomas (CErsted). 



