3 



III. Cuvierius, Gray, I. c. 114, 164. 



Rostrum of the skull broad, the outer side curved, es- 

 pecially in front. The second cervical vertebra with two 

 short thick lateral processes. First rib single-headed. 

 Sternum oblong-ovate, transverse. 



1. Cuvierius Sibbaldii, Gray, I. c. 380. C. latiros- 

 tris, Gray, I. c. 165. Physalus Sibbaldii, Gray, I. c. 160 

 (fig. 36), 380. Balaenoptera Sibbaldii (T. 33. f. 5, 6, ver- 

 tebrae). Balaenoptera Carolinae, Malm, Monog. Illust. 

 t. 44. Hub. North Sea. Mus. Hull. 



Vertebra 55. First and second ribs double-headed. 

 Second cervical vertebra with a broad lateral process 

 perforated at the base. Loiver jaw compressed, with 

 distinct coronoid process. Sibbaldius, Gray, I. c. 

 114, 169. 



I. Balaenoptera, Gray, I. c. 114. 



The lower lateral processes of the third to the seventh 

 cervical vertebras with an angular projection on the lower 

 edges. Fabricia, Gray, I. c. 382. 



1. Balaenoptera rostrata (T. 1. f. 5, baleen; T. 2, skull ; 

 T. 32. f. 3, 4, cervical vertebra), Gray. I. c. 188. figs. 49-53. 

 Hab. North Sea. 



II. Swinhoia, Gray, I. c. 382. 



The lower lateral processes of the third to the sixth 

 cervical vertebra; slender, regularly curved, without any 

 prominent angle on the lower edge. 



1. Swinhoia chinensis. Balaenoptera Swinhoei, Gray, 

 I. c. 382, figs. 88-93. Hab. Formosa. 



IV. Rudolphius, Gray, I. c. 170, 1865. Sibbaldius, 

 Lilljeborg, Nova Acta, Upsal. vi. 1867. 



Dorsal fin compressed, falcate, two-thirds of the entire 

 length from the nose. Ribs 13 . 13 ; first rib short, dilated 

 at the sternal end. Sternum elongate, not narrow at 

 posterior lobe. 



Section II. DENTICETE, Gray, I. c. 62, 194. 

 (Odontoceti or Delphinoidea, Flower, /. c. 111.) 



1. Rudolphius laticeps. Sibbaldius laticeps, Gray, base of the skull. 



Teeth well developed in one or both jaws, sometimes 

 deciduous. Palate without baleen. Head large or 

 moderate, compressed. Tympanic bones two, dissimi- 

 lar, separate, becoming united, sunk in a cavity in the 



Gullet large. 



/. c. 170, figs. 37, 38. Hab. North Sea. 



V. Sibbaldius, Gray, I. c. 175, 1865. Flowerius, 

 Lilljeborg, N. Acta Upsal. vi. 1867. 



Dorsal fin very small, far behind, and placed on a thick 

 prominence. Ribs 14.14; first short, sternal end very 

 broad and deeply notched. Sternum with a broad short 

 hinder lobe. 



The suborders in the section have certain relations to 

 each other in two parallel series : — 



Teeth only in the lower "] 

 jaw. Cervical vertebra; >• 

 often united J 



Teeth well developed 1 

 in both jaws. Jaws *> 

 beaked J 



A. Nostrils separate, 

 elongated. 



Physeteroidea 



Susuoidea . 



B. Nostrils united, 

 transverse. 



Ziphioidea. 



Delphinoidea. 



1. Sibbaldius borealis, Gray, I. c. 175, fig. 39. 

 Flowerius gigas, Lilljeborg, N. Acta Upsal. vi. 1867. 

 Hab. North Sea. 



2. Sibbaldius Schlegellii, Gray, I. c. 178, figs. 

 40-48. Hab. Java. 



3. Sibbaldius? antarcticus, Gray, I. c. 381, fig. 87. 

 Hab. Buenos Ayres. 



Family IV. BAL^NOPTERID^. 



{Balanopterina, Gray, I. c. 114. Balanoptera, Gray, /. c. 



114; Lilljeborg, vi.) 



Dorsal fin high, erect, compressed, about two-thirds of the 

 entire length from the nose. Pectoral fin moderate, 

 with four short fingers. Vertebrae 50 ; cervical ver- 

 tebrae sometimes anchylosed. Neural canal broad, 

 trigonal. Ribs 11 . 11. The second cervical vertebra 

 with a broad lateral expansion perforated at the base. 

 First rib single-headed. Lower jaw with a conical 

 coronoid process. 



Suborder III. PHYSETEROIDEA, Gray, I. c. 195. 



Head blunt. Nostrils longitudinal, parallel or diverging, 

 each covered with a valve, the right often obliterated. 

 Teeth only in the lower jaw, fitting into holes in the 

 gums of the upper one. 



Family V. CATODONTLDvE. 

 [Catodonlina, Gray, /. c. 386, 387). 



Head compressed, truncated in front, very large. Blowers 

 separate, linear, in front of the upper part of the head. 

 Mouth inferior, linear. Pectoral fin short, broad, 

 truncate. Dorsal hump rounded. Skull elongate. 

 Crown concave, surrounded by a high perpendicular 

 wall formed by the doubled-up maxilla and occipital 

 bones. Upper jaw toothless. 



I. Catodon, Gray, I. c. 196, 386, 387. 



The atlas vertebra transverse; nearly twice as broad as 

 high ; the central canal subtrigonal, narrow below. 



