162 OXYNOE. 
liver, which is, however, composed of closely packed ramifying tubes. 
The group is therefore intermediate between Tectibranchiata and 
Ascoglossa, but nearer the latter. 
Synopsis of Genera. 
A. Pleuropodial lobes short, not produced in lateral processes ; shell 
globose-ovate, with a deep sutural sinus above (as in Akera) ; 
the apex concealed, vertex not umbilicated. Genus OxYNOE. 
AA. Pleuropodial lobes produced in spatulate or expanded lateral 
processes ; shell semi-ovate, the lip produced above the vertex 
but not incised, apex concealed, not terminal. 
Genus LoBicErR. 
a. Tentacles two. 
b. Lateral pleuropodial processes four, 
Subgenus Lobiger. 
bb. Lateral pleuropodial processes two, 
Subgenus Dipterophysis. 
aa. Tentacles four; lateral processes four, 
Subgenus Pterygophysis. 
Genus OXYNOE Rafinesque, 1819. 
Oxynoe Rar., Analyse de la Nature, ou Tableau de |’Univers et 
des Corps Organises, 1815, p. 143 (nude name); Journal de Phy- 
sique, de Chimie, d’Hist. Nat., ete. Ixxxix, 1819, p. 152.—Lopho- 
cercus KRoun, Ann. Sci. Nat. (3), vil, 1847, p.55.—Icarus ForBEs, 
Rep. Brit. Asso. Adv. Sci., 1848, p. 187 (1844). 
All of the generic names cited above were based upon the Medi- 
terranean species O. olivacea. 
Of the six species described, but one is at all fully known; the 
shells only of the others being figured. 
Geographic distribution of Species. 
Mediterranean: O. olivacea. 
West Indies: O. antillarum. 
Indo-Pacific: O. krohni, O. viridis, Sandwich Is. 
O. delicatula, Ceylon. 
O. hargravesi, New Hebrides. 
©. on1vAcEA Rafinesque. Frontispiece, fig. 17; Pl. 11, figs. 43, 44, 
46-50, 58-62 (enlarged). 
