Dr. J. E. Gray on a Species of Teredo. 323 
In the same manner Professor Eschricht, of Copenhagen (and no 
one has studied the Whales of the North Sea with greater earnest- 
ness and success), regards Hyperoodon latifrons as the male of the 
old well-known Hyperoodon rostratum, because his example of the 
former belongs to a male, and that of the latter to a female specimen ; 
and he exhibits them side by side as sexes of the same animal in his 
Museum (see Ann. and Mag. Nat. Hist. 1852, ix. p. 281). Now 
this is an evident mistake, arising from mistaking an accidental coin- 
cidence for an established fact. 
The specimen from which the skeleton of Hyperoodon latifrons 
was derived, that is in the Museum of the College of Surgeons in 
Edinburgh, was a female, which was taken on the 24th of October, 
1839, accompanied by a young male, in the Frith of Forth. Therefore 
there are female as well as male specimens known of Hyperoodon 
latifrons, which is regarded by Professor Eschricht as the male of the 
more common H. rostratum, of which I have also seen males as well 
as females, as recorded in my paper on this subject in the ‘ Pro- 
ceedings’ of the Society for November 1860. 
On a LarGe Species or TEREDO, SUPPOSED TO BE THE 
ANIMAL OF THE GENUS FuRCELLA, Lamk. By Dr. J. E. 
Gray, F.R.S., V.P.Z.S., F.L.S., erc. 
In a former communication to the Society on the genus Furcelila, 
I came to the conclusion that the animal of that genus was destitute 
of any shelly valves, because on examining the tube of a young 
specimen in a very perfect state, containing in its cavity the two 
palettes of the animal, it had no appearance of valves, which I sup- 
posed would be of too large a size to have escaped out of the tube, 
more especially as the palettes were in it, which were of a much 
smaller size and more slender character than the valves were likely 
to be, and the tube had all the appearance of the animal which 
formed it having been eaten out by the larve of Muscidae, as the 
skins of the larvee and pupa-cases were found in the tube with the 
palettes. 
But this shows the danger of coming to any conclusion without 
having the actual specimen before one ; for we have lately received 
from Mr. Jamrach, along with a number of Fishes, Reptiles, and - 
other animals in spirits, chiefly from the Dutch Colonies of the 
Indian Ocean, two specimens of a large species of true typical Te- 
redines in spirit, without their shelly tube, but with their palettes 
attached, which seem to be very probably the animal of the genu 
Fureella. 
The reason why I believe them to be the animal of that genus is, 
first, their large size, which is quite sufficient to form a tube as large 
as the younger specimen of the genus Furcella, and, secondly, the 
form and size of the palettes, which agree in general character with 
those which were found in the tube of Furcella, and which are 
figured in the ‘Proceedings’ of the Society for 1857, p. 243, Mol- 
lusea, pl. xxx1x. f.3. Yet there is just that amount of difference 
