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Show 1882.] MR. H. DRUCE ON NEW HETEROCERA. 777 and inner border, at the junction of the ilium and ischium (Plate 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 Carnivora1, and, as m y friend Mr. G. B. Howes 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. Brain, superior view: px, outer parietal convolution; p2, middle parietal convolution; p', inner parietal convolution; eg, callosal gyrus: natural size. 2. Brain, inferior view, natural size. 3. Brain, lateral view, natural sizs : in, island of Reil; ol. p, olfactory peduncle; p.t.s, parieto-temporal sulcus; sy, rudimentary Sylvian fissure. The outlines of figs. 1-3 were taken from a cast of the cranial canty. Fig. 4. Internal view of rigbt cerebral hemisphere : a. c, anterior commissure f body of fornix; cc, corpus callosum; c. 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. 7. ,, ,, lower premolar, nat. size. 8. ,, ,, lower milk-molar, nat. size. 9. Internal view of right tympanic bone (fy), showing also the tympanic fibro-cartilage (ty'), which is slightly displaced downwards, and os bullae (o.b): m, malleus; in, incus; st, stapes; ty. m, tympanic membrane; eus, eustachian groove; /. t, mass of fibrous tissue in which the os bulla} 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. The 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 Heterocera. By H E R B E R T DRUCE, F.L.S., F.Z.S. [Received December 19, 1882.] (Plates LX. & LXI.) 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 mv collection. The specimens of the new Castnia 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 complete list of this collection, with descriptions of tbe new species, I hope to be able to publish shortly. 1 Milne-Edwards, ' La Physiol, et l'Anat. comp.' tome x. p. 358. |