1868.] NOTES ON HEPTRANCHUS INDICUS. 37 1 



Comparison of the two Sharks, with their points of difference. 



Galeocerdo tigrinus as given in Galeocerdo rayueri as figured 

 Miiller and lienle. and described in the present 



pajper. 



1. Frontal elevation of doubt- 1. No frontal elevation, 

 ful character. 



2. A hazel eye. 2. Iris bronzed silver. 



3. A warm brownish tint ex- 3. Head, upper surface of 

 tending over the head and upper back, tail, and fins bluish grey, 

 surface of body and tail, with without oblique marks extending 

 oblique streaks'extending to the to the gill-openings or under the 

 gill-openings and under the throat. No warm brown tint ob- 

 throat. servable anywhere. 



4. Upper lobe of tail, from 4. Upper lobe of tail, from 

 tail-pit * to extremity, over a tail-pit to extremity, a little more 

 third of the whole length of the than one-fourth of the whole 

 fish. length of the fish. 



5. Lower lobe of tail less than 5. Lower lobe of tail nearly 

 one-third the length of the up- half the length of the upper, 

 pert- 



DESCEIPTION OF PLATE XXXII. 



Fig. 1. Eepreseutation of the recent fish. 



2. Portion of sliin, magnified about 20 diameters. 



3 It. Upper jaw. b. Lower-jaw teeth. 



4. Inferior aspect of tlie head. 



b. Tlie nostril, with blunt triangular flap. 



6. Notes on Heptranchus indiciis, chiefly as regards Sexual 

 Characters. By J. D. Macdonald, M.D., F.R.S., aud 

 Mr. Charles Bareon, of the Haslar Museum; with 

 Drawings from Nature by Dr. Macdonald. 



(Plate XXXIII.) 



The subjects of the present paper, male and female of Heptranchus 

 indicus, were taken by F. M. Rayner, Esq., Staff-Surgeon, R.N., 

 in Bass's Straits, in January 1858 ; and in addition to the beautifully 

 preserved jaws, portions of skin, &c., he made accurate notes of 

 all the principal characters, with the dimensions aud colouring as 

 observed in the fresh state; and these remarks we transcribe in 

 extenso : — 



The head flat, with minute spiracles placed behind the eye, near 

 the top of the head, and vertical to the corner fold of the mouth ; 



* No inferior tail-pit is given in this figure, nor in that of G. ardicm. 

 ■\ Though two notches are given near the extremity of the upper tail-lobe, 

 no distinct terminal lobe is represented. 



