Waite — Two ZiPHioiD Whales 213 



Vertebrae, Ribs etc. The miiii])er of vortebrae is as follows: Cervical- 



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7, Doi'sal 0, Liiinl)ai' 10, Caudal 20, tho teniiiiial nine being without processes. 

 The first three eervieals are connected. Tlie mntiher of doi-sals is generally set 

 down as len, in oni* sjiecinien nine onl>' possess ar1 iculat ions for the I'ibs, and we 

 have bnt nine pairs of rihs ; lliey wow all certainly recovered. The first seven 

 dorsal vertebrae bear zygapophyses. The luinl)ars are ke(>led below. The candals 

 are generally stated to be 19, we have 20 ; tlie total number of bones in the column 

 is 46, thus agreeing with that assigned by others, the individual differences 

 occurring in the relative counts of the dorsals and candals. 



The first perforated diapophysis is the 8th caudal: there are 11 chevrons, 

 the first of which is composed of two separate bones. 



M. layardii has a wide distribution in southern seas ; in Australasia it is 

 recorded from New Zealand and the Chatham Islands, Queensland, New South 

 Wales, and now South Australia. It was originally described from Capetown, 

 and the "Challenger" obtained it at the Falkland Islands. 



2. MESOPLODON GRAYI Haast. 



Mesoplodon (Oulodon) c/rdiji Haast, Proc. Zool. Soc, 1876, p. 7 and 4.'i7. 



The subject upon Avhidi the identification rests is the right mandibular ramus 

 of a specimen found on the beach at Kingseote, Kangaroo Island, and forwarded 

 to the Museum on April 26, 1910, by Mr. A. H. Anderson, Harbour Master. It was 

 generically identified by Mr. F. R. Zietz and labelled "Mesoplodon, sp.?" 



The tooth was in sit it when found, l)ut someone cut the bone away on the 

 outside and the tooth can now he removed and replaced. It can he inserted on 

 either face, but as it fits only in one of the two positions, the conditions as below 

 described are assumed to be correct. The tip of the mandible is missing, so that 

 no useful comparative dimensions can l)e supplied; the symphysial connection 

 appears to have been unossified, excepting perha]3s in its anterior portion; the 

 tooth stands at the hinder part of the juncture, its greater portion being in 

 advance of the posterior connection of the symphysis. It is erect in the jaw, but 

 the general curve, in which the enamel portion or denticle participates, is gently 

 inwards, and the extreme tij), for al)out 1 mm., is curved outwards. When 

 removed from the jaw, the shape presented is that of a flattened cone, suddenly 

 expanded below at about half its height, with the basal margin strongly boAved ; 

 if inverted and the denticular i)orti()n held l)etween finger and thumb, the 

 resemblance to some of the flabelliform corals is very striking. The tooth is 



ft 



hollow, the denticle included : th(^ latter occupies about one-fourth the total 

 height, and its sides all round ])ass evenly into the contour of the base. 



The fact that such a small portion of the animal is available for examination 

 renders determination somewhat uncertain, but a study of the literature seems 

 to indicate that the ramus should be assigned to Mesoplodon grayi Haast. As the 



