350 PHILOSOPHICAL TRANSACTIONS. [aNNO 1787. 



young one, the milk, whieh was tasted by Mr. Jenner, and Mr. Ludlow, Sur- 

 geon at Sodbury, was rich like cow's milk to which cream had been added. 



The mode in which these animals must suck would appear to be very inconve- 

 nient for respiration, as either the mother or young one will be prevented from 

 breathing at the time, their nostrils being in opposite directions, therefore the 

 nose of one must be under water, and the time of sucking can only be between 

 each respiration. The act of sucking must likewise be different from that of 

 land animals; as in them it is performed by the lungs drawing the air from the 

 mouth backwards into themselves, which the fluid follows, by being forced into 

 the mouth from the pressure of the external air on its surface ; but in this tribe, 

 the lungs having no connection with the mouth, sucking must be performed by 

 some action of the mouth itself, and by its having the power of expansion. 



Explutia'ion of the Plates. — PI. 5, fig. 1. This fish, called a grampus, was 24 feet long : it was 

 caught in the mouth of the river Thames, in the year 1759, and brought up to Westminster Bridge 

 in a barge. 



Fig. 2, another species of grampus, 18 feet long, which was caught in the river Thames, 15 

 years ago. 



Fig. 3, a species of bottle-nose whale ; the Delphinus Delphis of Linnaeus. It was caught on 

 the sea-coast, near Berkeley, where it had been seen for several days, following its mother, and 

 was taken along with the old one, and sent up to me whole, for examination, by Mr. Jenner, sur- 

 geon, at Berkeley. The old one was 1 1 feet long. Fig. 6, the head of the same whale as fig. 3, 

 to show the shape of the blow-hole, which is transverse, and almost semi-circular. 



Fig. 4, the bottle-nose whale described by Dale, and 21 feet long. It is similar to that of fig. 3, 

 in its general form, but has only 2 small pointed teeth in the fore part of the upper jaw, and is 

 rather lighter coloured on the belly. It was caught above London Bridge in the year 1763, and be- 

 came the property of the late Mr. Alderman Pugh, who very poUtely allowed me to examine its 

 structure, and to take away the bones. 



Fig. 5, the balaena rostrata of Fabricius, or piked whale. It was caught on the Dogger-Bank. 

 It had met with some accident between the 2 lower jaws under the tongue, in which part a consider- 

 able collection of air had taken place, so as to raise up the tongue and its attachments into a round 

 body in the mouth, projecting even beyond the jaws. This rendered the head specifically lighter 

 than the water, so that it could not sink, and therefore was easily caught. It was 17 feet long, and 

 was brought tu St. George's Fields, where I purchased it. The dorsal fin having been cut off close 

 to the back, is therefore only marked by a dotted Hne. 



Fig. 7, includes the external parts of generation, with the relative situation of the anus and the 

 nipples, of thebalgena rostrata. a a, the labia pudendi spread open, exposing the meatus urinarius, 

 vagina, and anus, which in a natural state are all concealed, there only appearing a long slit, of 1 5 

 inches length, the 2 edges of which are in contact, b, the clitoris ; c, the meatus urinarius j n, 

 the opening of the vagina ; e, the anus ; f, the sulcus, in which the left nipple lies, spread open, 

 and the nipple itself exposed to view ; g, the sulcus of the right nipple, in a natural state, only ap- 

 pearing like a line ; h, a sulcus near to the nipple, which is spread open to show the inside This 

 sulcus I conceive gives a freedom to the motion of the skin of these parts, so as to allow the nipple 

 to be more freely exposed ; i, the same sulcus on the opposite side, closed up. 



Fig. 8, a side view of one of the plates of whalebone of the balaena rostrata. a. The part of the 

 plate which projects beyond the gum ; b, the portion which is sunk into the gum ; cc, a white sub- 

 stance, which surrounds the whalebone, forming there a projecting head, and also passing betweea 



