278 Ml'ssis. T. Southwell and S. F. Ilarnier on a 



The blow-hole was slightly In advance of the eye and was 

 crcseentic in shape, the horns of the crescent pointing 

 forward. Tiie major portion of the blow-hole was situated 

 to the left of the medial line of the head, but we could not 

 detect any other asymmetry in the arrangement of this aper- 

 ture. In Sir W. Turner's specimen the right limb of the 

 crescent was slightly in front of the left. 



The head was very prominent dorsally for a short distance 

 in front of the blow-hole. 



The pectoral limb was relatively small and was situated at 

 a low level on the animal, convex on both its borders and 

 somewhat sharply pointed. A cutaneous groove passed 

 forwards from its anterior end, continuing the line of its lower 

 margin *, the length of the lower border, measured along the 

 curve from the anterior end of this groove, being 1 foot 

 9i inches, whereas the length of the upper border (also 

 measured along the curve) was 1 foot 5j inches. 



The dorsal fin was situated considerably behind the middle 

 of the animal (not quite two thirds) and was strongly falcate 

 behind ; its base measured 1 foot If inches and its height was 

 7^ inches. The commencement of the fin was 10 feet 

 2 inches from the tip of the rostrum, and the posterior end of 

 its base was 5 feet 11 inches from the middle of the border of 

 the dorsal fin, both measurements following the curve of the 

 back. 



The greatest dorso-ventral diameter (3 feet 5 inches) was 

 about midway between the pectoral and dorsal fins. The 

 large size of the middle of the body, which tapered to much 

 smaller dimensions at either end, was one of the most obvious 

 of the external features of this specimen, and in this it agreed 

 closely with the published accounts of other individuals; it 

 must not, however, be forgotten that the Overstraud specimen 

 was in a pregnant condition when captured. 



The body became laterally compressed near the tail, and 

 both the dorsal and ventral edge formed a conspicuous ridge 

 or medial keel passing a short distance along either surface of 

 the tail, which was entire on its posterior border, the place 

 of the medial notch, as in Ilyperoodon, being taken by a 

 slight convexity, which in this specimen had, however, been 

 somewhat abraded by the rope used in its capture. The 

 flukes of the tail measured 3 feet 8 inches from tip to tip. 



• This could not be shown in fijr. 1, in wliich -what is apparently the 

 insertion of the limb is really the termination of the cutaneous groove 

 mentioned above. 



