LAGENOKIIYNCHUS SUPEKCILIOSUS. *J3 



ganliug the skeleton iu question, Sclilegel makes the following state- 

 ments : 



That this species (D. superciliosits), moreover, occurs off the C;ipe of Good Hopeap- 

 l)ears frooi the observatious of our kite explorer, Dr. Vau Horstok, who has seut us a 

 complete skeleton of the species.* 



What the observations of Vau Horstok were does not api)ear. They 

 seem to have been such as to convince Schlegel that his skeleton be- 

 longed to Lesson and Garnot's D. superciliosus. 



The following is a description of this skeleton : Ko. 40; Voy. Horstok ; 

 Cape of Good Hope. Vertebrae: C. 7; D. 13; L. and Ca., 53 ; total, To. 

 Lumbars twenty. Chevrons twenty. Only the atlas and axis united. 

 Superior transverse process of the seventh cervical vertebra long; 

 the others rudimentary. Inferior transverse process of the sixth cervi- 

 cal rather long ; of the fifth shorter ; of the other cervicals, rudimen- 

 tary. Neural spines of the third to the seventh cervicals very short. 

 Neural spine of the first dorsal pointed ; the succeeding ones increase 

 in breadth backward to the tenth or eleventh dorsal, then again de- 

 crease. Those of the lumbars subequal. Neural arch obsolete on the 

 sixtieth vertebra. Transverse process obsolete on the fifty-fifth verte- 

 bra. First six ribs with heads; these ribs also join the sternum. 

 Sternum of four segments ; the first largest, the last rather rudimentary. 

 Acromion long and broad, reaching to the anterior angle of the scapula ; 

 coracoid about one-half the length of the acromion, broadened at the 

 extremity. Radius and ulna straight. Carpals five ; three large ones 

 in the distal row, two smaller ones in the proximal row. (Manus de- 

 fective.) 



Slull. — The skull resembles that of P. ohscurus, but the iutermaxillie 

 are more nearly flat. The prenarial triangle extends about an equal 

 distance before and back of the maxillary notch, and is depressed, but 

 flat and not rugose. The sides of the intermaxilkxi bordering the nasal 

 aperture are beveled as in Cephalorhynchus. The maxilhe are but little 

 bent. A wide opening (!"" at the widest point) intervenes between 

 the premaxilhe and extends along the entire beak. Palate very flat. 

 Pterygoids on a wide base (4.1""); they are broken, but were appar- 

 ently in contact, except at the tip. The ramus of the mandible is slen- 

 der toward the symphysis, which is not strongly keeled. Teeth, ^jJ-IJI. 



Scaiiula, 15.5"" long; 9.8™ high. Highest neural arch, 8.4'". Total 

 length of the skeleton as mounted, 153 "'. 



The chief peculiarities of the skull of this species are the flatness of 

 the premaxillae and the beveling of their proximal extremities. In these 

 respects it is very different from that of P. ohscurus, with which it agrees 

 well in proportions. On account of the flatness of the intermaxilhe and 

 the crowding of the foramina at the symphysis of the mandible, I am 

 inclined to place this species in the genus Lagenorhynchus. The small 



* Schlegel, AhhaudUuigen, Heft i, 1841, p, 22, 



