Pomona College, Claremont, California 3 
A very large and finely preserved female, recently sent me by 
Prof. William A. Hilton, now settles the matter without question. 
This specimen (S. S. B. 453) was obtained from near Avalon, 
Santa Catalina Island, California, in the summer of 1915, by 
Mr. W. F. Hamilton. Unfortunately I have no comparative 
material from other regions available, so that with only the aid of 
such figures and printed descriptions as are at hand, the specimen 
cannot be distinguished from the Mediterranean O. tuberculata, de- 
scribed and named by Rafinesque just over one hundred years ago. 
As tuberculata happens to be the only species of the genus enjoy- 
ing general recognition, and as it is a pelagic creature with the pos- 
sibility of very wide dissemination, the identification seems never- 
theless to be reasonably certain, though it should be admitted that 
the areas it is alleged to inhabit are so widely separated that ade- 
quate material may later reveal differences which will be thought 
worthy of recognition. 
In addition to Mediterranean localities the species has been re- 
ported from Vineyard Sound, Massachusetts, from the West In- 
dies, and from Japan. 
The sexes in this genus, as in the related Argonauta and Trem- 
octopus, show such extreme dimorphism, that the description of one 
applies in scarcely a single particular to the other. The female 
Ocythoe, however, is very easily distinguished from other cephalo- 
pods by the large Octopus-like body, the ventral surface of which is 
very curiously ornamented with numerous conspicuous cartilaginous 
tubercles, connected by radiating ridges. The enormous and power- 
ful funnel is also noteworthy. 
The more important measurements of the present specimen are 
appended below, many of them necessarily more or less estimated. 
MEASUREMENTS 
PCOS Shyu d QA 2am cae AD Late 9 SC easel whet oot ll a Ba 440 mm. 
Wench ot body, (Gots) s:22 0 cetarce onc eee. de csexcdacnazeshecncses 160 mm. 
Wewethouh bodys ( ventral) ee rt ee aces 155 mm. 
“Lip of meuy to base of dorsal arms... .2.25.:-<.-,<-2<ce-vaicanseaces 170 mm. 
ISG ig Lf fee OS it~ ae A Sr 115 mm. 
Vache Deo tele Clescetcs ne a re ee Jo Re. dae ee 74 mm. 
