CETACEA OF THE NEW ZEALAND SEAS. 571 



processes ending in articular facets for the heads of the last three 

 ribs. On the 8th and following vertebrte the transverse processes 

 and metapophyses are widely separated, the former being opposite 

 the centra. Lumbars with strong inferior median carina. 

 Neural spines truncated and expanded at their distal ends. 

 Metapophyses lamellar, projecting forward and upward. Anterior 

 11 caudals showing facets for chevron bones. The last four are 

 depressed oblong bones with no processes, but there appear to be 

 some missing between the two series. Transverse processes 

 reduced to ridges on the 8th caudal, neural spine rudimentary on 

 the 11th (the 12th and other caudals presumably missing). 



Ribs, 10 pairs. The first seven are two-headed, articulating by 

 both capitula and tubercula. The first articulates wdth the 

 centrum of the 7th cervical and the transverse process of the first 

 dorsal, the 7th articulates with the centrum of the 6th and the 

 transverse process of the 7th dorsal. The 8th, 9th, and 10th are 

 «ingle-headed and articulate with the transverse processes of the 

 6th to 10th vertebrae. The first two ribs broad and flat, with 

 the proximal ends strongly curved ; the remainder with the 

 proximal ends below the articular tubercles roughly triangular or 

 quadrangular in section, the distal ends being flattened. 



The greatest length of each rib on the right side in a straight 

 line is as follows : — 1st, 30-5 cm, : 2nd, 46-8 cm. ; 3rd, 54*7 cm. ; 

 4th, 59-0 cm. ; 5th, 60-3 cm. ; 6th, 60-4 cm. ; 7th, 60-0 cm. ; 

 8th, 55-2 cm. ; 9th, 50-5 cm. ; 10th, 42-5 cm. 



Sternum : The sternum consists of four segments. Three 

 fenestras are formed at the junctions by notches in the middle of 

 the anterior and posterior margins of the segments. There is a 

 fourth fenestra in the centre of the posterior segment. On each 

 side are five facets for the articulation of the costal ribs — one on 

 the anterior segment, one on the posterior, and one at each of the 

 junctions. 



(1) (2) (3) (4) 



mm. mm. mm. mm. 



Greatest length of segments 182 116 90 130 



Greatest breadth of segments 195 130 105 102 



Scapula : Breadth, 30-4 cm., length (median), 20 cm. Median 

 length of acromion and coracoid, each about 9 cm. Acromion 

 broad, lamellar projecting upward. Coracoid slender, expanded 

 distally. The superior margin of the acromion is clear of the 

 coracoid border. (PI. IV. fig. 3.) 



Comparison with type of M. howdoini : — The present specimen 

 difi"ers from the type of M. hoivdoini from New Brighton in no 

 important respect. In the genei'al proportions of the skull and 

 mandible they appear to be within the range of individual 

 variation, and agree in those characters separating M. hoivdoini as 

 a species : these are the absence of a basirostral groove, short 

 symphysis of mandible, position and size of tooth, relative positions 

 of palatines and pterygoids, overhanging maxillary crest, and 



