1S82.] MR. H. DRUCE ON NEW HETEROCERA. 717 



and inner border, at the junctjon of the iUum 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. tlowes has pointed out to me, is invariably 

 present in the Rabbit (fig. 11, c). Both these ossifications are 

 probably to be regarded only as epiphyses. 



EXPLANATION OF PLATES LVIII., LIX. 



Fig. 1. Bi-ain, superior view: p'. outer parietal convolution; /)^ miiklle 

 parietal convolution; i>\ inner parietal cjuvolution ; c.(/, callosal 

 gyrus : natural size. 



2. Brain, inferior view, natural size. 



3. Brain, lateral view, natural siz3 : in, island of Reil ; ol. p, olfactory 



peduncle ; p.t. s, parieto-temporal aidcus ; sj/, 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. a, anterior commissure ; 

 / body of fornix; c.c, corpus callo.<um ; c. g, callosal gyrus, above 

 which is seen the calloso-marginal sulcus. 

 5. Crown of first upper premolar, nat. size. 

 (i. „ ,, upper milk-molar, nat. size. 



7. ,, ,, lower premolar, nat. size. 



8. ,, ,, lower milk-molar, nat. size. 



9. Internal view of right tympanic bone {t>i). showing also the tympanic 



fibro-cartilage {ty'), which is slightly displaced downwards, and the 

 OS bullaj {o.b): m, malleus; in, incus; .s;*, stapes; t;/. m, tympanic 

 membrane ; ens. eustachian groove ; /. t, mass of fibrous tissue in 

 which the os bullae is imbedded: two thirds nat. size. 



10. The acetabular region of the left innominate bone, from the inner 



side : il, ilium : is, ischium ; pu, pubis ; cp, epiphysis : one half nat. 

 size. 



11. Tiie same region of the right innominate bone of a Rabbit, from the 



outer side : c, cotyloid bone ; c. n, cotyloid notch ; il, ilium ; is, 

 ischium ; pu, pubis : nat. size. 



12. Descriptions of a new Genus and some new Species of 

 Heterocera. By Herbert Druce, F.L.S., F.Z.S. 



[ReceiTcd December 19, 1882.] 



(Plates LX. & LXI.) 



Examples of the species here described have been received by nie 

 from time to time during the last two or three years, and added to 

 my collection. The specimens of the new Casfnia were collected 

 by Mr. C. Buckley in Ecuador, and form part of a very fine series 

 of Heterocera from that country, containing a large number of new 

 species. A coniplete list of this collection, with descriptions of 

 the new species, I hope to be able to publish shortly. 



1 Milne-Edwards, ' La Physiol, et I'Anat. comp." tome x. p. 3o8. 



