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Show 1867.] PROF. W. LILLJEBORG ON HALCROSIA AFZELII. 715 inches. Total length 43| Height under first dorsal 7 Head, width at spout-holes 54 Eye-slit, length 2\ , distance from snout 2\ Spout-holes, length 44- Mouth, width = distance from snout .... 3-f Pectorals, width of base 2 , distance from snout 9 \ First dorsal, length of base 5$ , vertical height 2g Second dorsal, length of base 3\ , vertical height 2\ Ventrals, width of base lf- , distance from snout 27 Caudal, length 9| 7. Description of Halcrosia afzelii*, a new Crocodile from Sierra Leone, W e s t Africa. By W I L H E L M L I L L J E B O R G, Professor of Zoology in the University of Upsala, F.M.Z.S. Length from the point of the nose to the tip of the tail about 4' (Swedish workmen's measurefj i- e. with 12 inches to the foot). Length of the head from the os quadratum 7\" ; breadth of the head at the back part 4|"; its length from the posterior extremity of the under jaw 8", from the orbits to the point of the nose 3|"; breadth of the nose over the ninth tooth, the widest part of the upper jaw, 2T 7g". Length of the tail 2'. The head's length in proportion to its breadth marks it as a short broad form; the nose is, however, much narrower than in the Halcrosia frontata (Murray) J, as is evident by the proportion of the breadth above the ninth tooth to the distance between the orbit and the tip of the nose, the former being but about two-thirds of the latter. According to Murray's figure this breadth amounts to three-fourths of the above-mentioned distance. With respect to the form of the nose, it appears to be intermediate between Halcrosia frontata and Crocodilus vulgaris. The fossae supratemporales are small, and their lower openings very small, situated in front, and directed outwards and forwards. The supratemporal or sincipital plane is somewhat concave in the middle, and the forehead between the orbits destitute of keel. * With this name we call to remembrance the late Professor Adam Afzelius of Upsala, who brought home to Sweden from Sierra Leone this specimen, together with many other interesting specimens of animals and vegetables. f Swedish feet and (workmen's) inches are reduced to English by multiplying hy 0-9741, or dividing by 1-0266. J Gray, P. Z. S. 1862, p. 213. |