ANATOMY OF MEGAPTERA LONGIMANA. 17 



20. EXPLANATION OF PLATES I. AND II. 



Fig. 1. View of the whale as it lay on the back at Stonehaven, 

 drawn by Mr A. Gibb, from a photograph by Mr George W. Wilson, 

 of Aberdeen, taken on the day after it was beached there. The 

 plaitings of the skin on the throat, chest, and abdomen are exactly 

 given. The throat is concave, the tongue having floated out of the 

 mouth with the retiring tide. White patches are seen on the project- 

 ing skin where it turns in below the mandible, and a few less marked 

 patches of white on the throat and chest. The inner surface of the 

 pectoral fin, and under surface of the tail fin, are seen to be white. 

 The pectoral fin lay abducted, and was much foreshortened in the 

 photograph. I have drawn it directed more naturally backwards, 

 and rotated outwards, giving a full view of its length and breadth, 

 and showing accurately the nodes on its lower (radial) border, nine 

 in number, the first and fourth nodes the most prominent. A rapid 

 fall is seen on the contour from an angle some way behind the anus, 

 presumably from the longer chevron bones backwards. 



Fig. 2. The dorsal fin, reduced to ^^ n - The two kinds of 

 shading represent the distinction between the fin proper and its 

 basement. The position of the highest part and of the point, and 

 the form of the notch are exactly given. 



Fig. 3. The tail fin ; reduced to -^th. The inward curve of the 

 tips is seen. 



Fig. 4. The mammillary pouch and the nipples; natural size. 

 The sides of the pouch are hooked out so as to bring the nipples 

 into view, on each side of the median septal plug. The aperture of 

 the primary milk duct is seen some way down on the outer side of 

 the nipple. The full size of the aperture is shown on the right 

 nipple. 



Fig. 5. From a photograph taken at Dundee by Mr F. G. Roger, 

 of Broughty Ferry; reduced to about T ^, being the size of the 

 photograph. On the upper jaw are seen the dermal tubercles, the 

 median row single, the lateral row mostly in pairs. On the mandible 

 the more posterior of the lateral tubercles on it are seen. The com- 

 mencement of the plaitings of the skin is seen below the mandible. 

 , The cut-water; 6, the position of the blow-holes, on the hinder 

 slope of an eminence ; p.f., commencement of the pectoral fin ; e, the 

 ear-hole, e.g. ; the labial, or spill- water, groove. The narrow groove 

 below the shoulder is not a continuation of it. The tongue is not 

 seen, having fallen out. 



B 



