110 Mr. W. T. Blanford on the Occurrence of 
In his revision of that paper, published in the same work 
for November 1866, page 671, he places it as a ncn or 
subspecies of what he calls Otarta falklandica, which is my 
Arctocephalus nigrescens, and not the Otaria falklandica of 
Shaw nor the Otaria falklandica of Burmeister as Dr. Peters 
supposes, as I have shown above. In this paper he removes 
Otaria falklandica (that is, nigrescens) from the subgenus 
Phocarctos, to which he referred it in his first paper, and places 
it in his subgenus Arctophoca. 
I have not seen the skull; but I believe, from the figure, 
that this alteration is a mistake. The figure of the skull of 
his Otartia Philippit has no resemblance to the skull of my 
Otaria nigrescens. It is more nearly allied to the skull of 
Otaria Stellert from California, agreeing with it in having a 
vacant space with a pit in the bone between the fourth and 
fifth upper grinders on each side, looking as if a grinder had 
fallen out and the cavity had been filled up. . 
The subgenus Arctophoca of Dr. Peters’s first essay, not as 
modified in his second one to contain O. falklandica(nigrescens), 
chiefly differs from Gill’s genus Humetopias, which was formed 
on my description and figure of the skull of Otaria Stelleri (or 
californiana), in the fifth upper grinder not being so far back, 
but in a line with the back edge of the orbital process of the 
zygomatic arch, instead of far behind it as it is in Hwmetopias. 
XVIII.—On the Occurrence of Diplommatina Huttoni and 
Ennea bicolor in the West Indies. By WituiAm 'T. BLAN- 
FORD, F.G.S., C.M.Z.8. 
In the ‘Annals and Magazine of Natural History ’ for August 
1867, Mr. R. J. Lechmere Guppy described the occurrence in 
Trinidad of Diplommatina Huttont, Pfr., and suggested that 
its presence and that of Hnnea bicolor, Hutton, might be ac- 
counted for by supposing both to have migrated across the 
Tertiary Atlantis. 1 cannot help thinking that there are se- 
veral circumstances opposed to this view; and in order to 
explain them it is necessary to describe the distribution of 
Diplommatina Huttoni and Ennea bicolor in India. 
Diplommatina Huttoni has hitherto only been found on the 
lower slopes of a portion of the Western Himalayas, near 
Mastri. It is true that the Himalayas have not been explored 
to a sufficient extent to justify the assertion that the shell does 
not exist elsewhere; but, as not a single Western Himalayan 
Diplommatina has as yet been found in those parts of the 
Eastern Himalayas about Darjiling which have been compa- 
ratively well explored, nor, vice versé, a solitary Darjiling 
species in the Western Himalayas, it is extremely improbable 
SECA Be i ee Tg Rs 
