406 CETACEA. 



granular substance, and what appeared to be fat or oil globules. Partly embracing 

 the corpus luteum vesicle was a broad stripe of pale-coloured tissue (fig. 11, ph.), 

 which ran towards the centre of the ovary, divaricating and thinning, and latterly 

 terminating deeply in stellate areas. In this pale band, several cavities of different 

 sizes and shapes existed, bearing a resemblance to empty Graafian follicles. The 

 tissue forming this pale band differed in nature from the cellular stroma, being 

 made up of a basis of homogenous structureless membrane, and imbedded in this 

 was a multitude of elongate or oat-shaped nucleated fibre cells closely resembling 

 the contractile fibre cells of unstriped muscular tissue. Other pale bands and 

 streaks similar to what has been above described traversed the ovary at different 

 points from its circumference centripetally, and some of the finer streaks joined 

 others, forming a sort of irregular net-work of thin white lines distributed through- 

 out the stroma generally. 



The foetus of Orcella brevirosiris (Plate XXXIII, fig. 1) : a female, is moderately 

 elongated, with a roundish head and the body laterally compressed behind the dorsal 

 flipper, the posterior margin of which is on a line with the anterior end of the vulva. 

 Erom the margin of the upper lip the head is rounded off to the blow-hole, and there 

 is no projection of the upper lip as in Globicephalus, but the tip of the lower lip is 

 slightly anterior to that of the upper. The sides of the head anterior to the eye are 

 flattened. The greatest swelling or rotundity of the head occurs over the eye. The 

 mouth arches upwards, until at its angle it is in front of the eye, but at a lower 

 level. On each side of the snout, 0"'50 above the lip, there is a more or less longi- 

 tudinal line of moustachial hairs (h) on either side of the head, four on the right and 

 six on the left, each hair being separated by an interval of about 0"'20 to 0"'28, and 

 being about 0"*50 long and of a brown colour, and situated in a little pit. The most 

 posterior hair is 1*75 inch from the angle of the mouth. 



The eye is well developed and shows indications of eyelids, but there are no 

 traces of eyelashes. Erom the inner canthus a depression curves upwards and 

 forwards, and a deep pit occurs in the canthus corresponding to the opening 

 of the lachrymal duct. A furrow also courses backwards from the posterior 

 angle. 



The external ear is a very small crescentic orifice, the convexity being directed 

 forwards. It is nearly on the level of the angle of the mouth and 2-60 inches 

 distant from it. 



The blow-hole is a crescentic orifice placed transversely and slightly to the 

 left side ; the convexity of the crescent being backwards and a little anterior to the 

 inner angle of the eye. In a straight line, its centre is distant 3 inches from the 

 tip of the upper lip. 



The pectoral flippers are moderately long and broad, but pointed, and about 

 equalling in size a caudal flipper. Their free border is sinuous corresponding to the 

 projections and intervals between the fingers, and the anterior margin is the outline 

 of the half of an elongated oval. Their liinder border is very short, and concave to 

 the depression at its origin. Behind the pectoral flippers the belly of course is 



