146 SPECIMENS OF SIRENIA. 



on the belly. Scattered delicate silky hairs were 

 more numerous on head and body than on limbs and 

 tail ; a short, stift' white moustache grew from the 

 muzzle. No dorsal fin nor hind limbs ; pectoral 

 limb 7 inches long, 3| broad. Tail lobed. 



1. Skeleton, adult, male; length 8 feet 6^ inches. Skull in 



straight line 16^ inches, over curve of vertex 22^ 

 inches. Spuie, length 7 feet 2 inches ; 19 pairs of 

 ribs; 15 chevron bones, in the last five of which the 

 lateral halves are not fused mesially ; 5 lumbar 

 vertebrae intervene between 1st chevron and last rib. 

 Vertebral formula C^D^gL-Cdgg = 59. Anterior nares 

 3 inches in transverse, 4| in sagittal diameter. Beak 

 formed by two large premaxillaries which lodge the 

 tusks ; these bones slope downwards from the anterior 

 nares for 8|^ inches. Mandible massive, 11 inches 

 long ; condyl flattened, relatively small ; coronoid 

 pointed, projects 2| inches, angle large, from it to 

 condyl 7 inches ; anterior end of bone broad, sloping 

 downwards in symphysial region for 5 inches and 

 showing four tooth sockets on right side and five on 

 left. Humerus without supra-condyloid foramen. 

 Pair of pelvic bones, slightly curved ; length 8^ inches, 

 attenuated at vertebral end, broader below. The 

 skeleton was received roughly cleaned ; it was care- 

 fully macerated and articulated so as to preserve the 

 bones and their relative positions. Front of face in 

 Plate XVI. 

 Queensland. Donor — Sir Wyville Thomson. 



2. Skeleton, immature ; ex-occipitals partially fused with 



basi - occipital, supra-occipital lost. Length 6 feet 

 6f inches. Skull, length in straight line 12| inches, 

 over vertex 20| inches. Spine, length 5 feet 6{ 

 inches; 19 pairs of ribs; only 7 chevrons present; 5 

 lumbar vertebra?. Vertebral formula C^D-^c^I^^Cd^c^ = 60. 

 Compared with No. 1, the spine is more complete. 

 Anterior nares 2| inches in transverse and 4^ in 

 sagittal diameter ; premaxillas slope down from anterior 

 nares for 6| inches. Mandible not so large as No. 1, 

 with four pairs of tooth sockets at symphysis. Right 

 pelvic bone 5| inches long, consisting of an upper 

 vertebral segment and a lower ventral segment fused 

 about the middle of the bone, but with the original 

 plane of separation distinct. 

 East Indian Seas. Knox Collection, No. 107. 



