1882. | MR. H. DRUCE ON NEW HETEROCERA. 777 
and inner border, at the junction of the ilium and ischium (Plate LIX. 
fig. 10 ep). I do not know that an ossification has been described in 
this region before, though a small bone, the cotyloid, lying between 
these elements on the lower border of the acetabulum, from which it 
completely excludes the pubis, is well known in some Carnivora‘, and, 
as my friend Mr. G. B. Howes has pointed out to me, is invariably 
present in the Rabbit (fig. 11, ¢). Both these ossifications are 
probably to be regarded only as epiphyses. 
EXPLANATION OF PLATES LVIII., LIX. 
Fig.1. Brain, superior view: p', outer parietal convolution; p?, middle 
parietal convolution; p’, inner parietal convolution; c.g, callosal 
gyrus: natural size. 
2. Brain, inferior view, natural size. 
3. Brain, lateral view, natural size: 7, island of Reil; ol. p, olfactory 
peduncle; p.¢.s, parieto-temporal sulcus; sy, rudimentary Sylvian 
fissure. 
The outlines of figs. 1-3 were taken from a cast of the cranial cavity. 
Fig. 4. Internal view of right cerebral hemisphere: a. c, anterior commissure ; 
f, body of fornix; c.c, corpus callosum; ec. g, callosal gyrus, above 
which is seen the calloso-marginal sulcus. 
5. Crown of first upper premolar, nat. size. 
6. ~ » upper milk-molar, nat. size. 
U. “ », lower premolar, nat. size. 
8. 6 ,, lower milk-molar, nat. size. 
9. Internal view of right tympanic bone (#7), showing also the tympanic 
fibro-cartilage (¢y'), which is slightly displaced downwards, and the 
os bulle (0.6): m, malleus; iv, incus; s¢, stapes; 7. m, tympanic 
membrane; ews, eustachian groove; f. 7, mass of fibrous tissue in 
which the os bullee is imbedded: two thirds nat. size. 
10. The acetabular region of the left innominate bone, from the inner 
side: i, ilium: is, ischium; pu, pubis; ep, epiphysis: one half nat. 
size. 
11. The same region of the right innominate bone of a Rabbit, from the 
outer side: c, cotyloid bone; c. 7, cotyloid notch; 7, ilium; is, 
ischium ; pu, pubis: nat. size. 
12. Descriptions of a new Genus and some new Species of 
Heterocera. By Herserr Deuce, F.L.S., F.Z.S. 
[Received December 19, 1882.] 
(Plates LX. & LXL.) 
Examples of the species here described have been received by me 
from time to time during the last two or three years, and added to 
my collection. The specimens of the new Castnie were collected 
by Mr. C. Buckley in Ecuador, and form part of a very fine series 
ot Heterocera from that country, containing a large number of new 
species. A complete list of this collection, with descriptions of 
the new species, I hope to be able to publish shortly. 
1 Milne-Edwards, ‘La Physiol. et l’Anat. comp.’ tome x. p. 358, 
