3. KOGTA. 219 



great width of the left nostril distorts these bones. The vomer, with 

 the side of the intermaxillaries, forms a broad hoUow canal. 



" The nostrils are in the middle of the upper surface of the head, 

 not perhaps so obliquely as in the genus Catodon, but they are of a 

 much more unequal size, one being more than ten times the size of 

 the other, throwing the nasal bones quite out of their place. The 

 right nasal bone is a very small triangle, at the base of the ethmoid, 

 which forms, with the right intermaxillary, the wall of the small 

 right nostril, and it forms the lower edge of the dividing ridge, and 

 terminates abruptly and perpendicularly above the base of the vomer. 

 The left nasal bone is more than 2 inches long, and somewhat paral- 

 lelogram in shape with the left intermaxillary. The left maxillary 

 and the ethmoid together form the wall of the very large left nostril. 



" The two massive maxilla) touch each other behind where they are 

 doubled by the occipital, and leave no part of the frontal visible. 



" The frontal is a heavy quadrilateral bone with concave sides, one 

 of which forms the top of the orbit. A part of the maxilla comes 

 near to the front angle of the orbit, and its posterior wall is formed 

 by part of the zygomatic apophysis of the temporal ; it does not join 

 the postorbital apophysis of the frontal, but leaves it open. The 

 lower part of the orbit has its front side formed of a short, thick, 

 triangular jugal. The fosso-temporalis is pear-shaped. 



" The roof of the mouth is convex, showing only two small points 

 of the intermaxillaries, one on each side of the line of the vomer, 

 and formed almost entirely of the under side of the enormous maxil- 

 laries. These each have a linear groove running from the front of 

 the snout for the pits for the teeth of the lower jaw. The palatines 

 are small, quadrilateral, the pterygoid very large. 



" The lower jaw is slight and fragile, with scarcely any condyles. 

 The broad branch nearly as thin as paper, with the side deflexed 

 inwards. The symphysis is short compared with that in Catodon, 

 and boat-shaped and keeled. Teeth 13 . 13, projecting horizontally 

 and curved upwards ; they have single roots. 



" The OS hyoides like that of Catodon, but the lateral pieces are 

 more rounded, and the anterior apophyses of the middle piece are 

 deficient. The styloidean pieces are subcylindrical, thicker at each 

 extremity. 



" The larger portion of the labyrinth of the ear-bones has six points, 

 and the other portion, which is spherical in Catodon, is in this genus 

 oval, as in Dolphins. The tympanum resembles the shell of the 

 genus Conus, with a wide longitudinal mouth ; in other respects the 

 ear resembles that of Catodon more than Delphinus. 



" Vertebrae 52 ; the seven cervical all confluent and soldered to- 

 gether, so as to be very difficult to distinguish one from the other. 

 The atlas and axis are marked out, and have blunt, conical, transverse 

 apophyses. The lower apophyses are evanescent ; the third and fourth 

 are thick, each marked with a short, conical, superior apophysis, 

 distinguished by four lateral holes ; the vestiges of the fifth, sixth, 

 and seventh are as thin as paper, and soldered. Dorsal vertebrae 14, 

 lumbar 9, caudal 21, thirteen with chevron bones attached, and eight 



