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Show 1878.] PROF. A. H. GARROD ON THE ANATOMY OF PLOTUS. 679 mydophorus and Dasypus than between Chlamydophorus and Tatusia. I am indebted to Dr. Young for the preparation of the accompanying illustrations. EXPLANATION OF PLATE XLIII. Fig. 1. Male generative and urinary organs of Chlamydophorus truncatus, seen from the front. From above downwards are seen the suprarenal capsules, the kidneys and ureters, the testicles, the bladder and urethra, and the penis. The penis is hooked back to show the retractor muscles on its dorsal aspect. 2. Male organs of Chlamydophorus truncatus, perineal view. From above downwards are seen :-the penis, its basal portion being covered by the fibres of the bulbo-cavernosi muscles ; below this the Cowperian glands lying in the interspace between the crura penis, these last being covered by the fibres of the ischio-cavernosi muscles. 3. Male organs of Chlamydophorus dissected, and seen from behind. K, kidney and suprarenal capsule; T, testicle; P, prostate gland; C, Cowper's gland; Te, penis; C p, crus penis. 4. Penis of Dasypus sexcinctus, showing the file-like structure on the lower aspect of its extremity. 5. Penis of Dasypus sexcinctus retracted within the prepuce. 4. Note on Points in the Anatomy of Levaillant's Darter (Plotus levaillanti). B y A. H . G A R R O D , M.A., F.R.S. [Received June 14, 1878.] In a former communication1 I had the opportunity of bringing before the Society several facts with reference to the anatomy of Plotus anhinga, and of confirming Mr. Macgillivray's account of its most peculiar proventriculus. Several specimens of the species have since passed through m y hands which differ in no way from that first described. On the 9th of March last the Society obtained for the first time, by purchase, a male specimen of Levaillant's Darter (Plotus levaillanti) from Senegal. It unfortunately died on the 7th of this month (May) from peritonitis, the result of a perforating ulcer in the stomach. The severity of the peritonitis caused all the abdominal viscera to be agglutinated into a single mass, and rendered them particularly soft. Nevertheless I was able to disentangle most of the alimentary canal for examination; and it has proved of more than ordinary interest, as the following description will serve to show. The tongue, as a free organ, is obsolete. The oesophagus is capacious, without any crop. The oesophageal epithelium ceases abruptly by a transverse line where the gastric portion of the canal commences, below which it is replaced by the tough yellow epithelium so characteristic of the situation. The proventriculus is composed of two circular areas of deep °*lands, which latter are of considerable size and do not come into con-i P. Z. S. 1876, p. 335. |