116 TRANSACTIONS OF THE [pHorelars 
Cladoselache newberryi proves of interest in its relation to 
Acanthodian, and in this regard will later be discussed. 
It differs from Cladoselache fyleri in proportions, and in fin 
characters. In the former regard the fossil permits the follow- 
ing body distances to be taken for contrast: (a) length and 
breadth of pectoral; (b) distance of pectoral from centre of 
orbital ring; (c) distance of ventral from pectoral; and (d) 
body breadth. To establish this contrast the proportions of 
Syleri were first determined. These proportions, drawn to 
scale in the accompanying figures, I. and [I., were taken in the 
first instance from a perfect example of this species whose 
structures have been figured in the current number of the Jour- 
nal of Morphology. The tabular measurements, then compared 
with those taken from the type specimens of fylerz, were found 
to be remarkably uniform. Slight allowance, however, is doubt- 
less to be made for distortion of body breadth. Axial per- 
centages and fin proportions are constant. 
In the following table the proportions are expressed : 
CLADOSELACHE FYLERI. 
Position and proportion of body parts expressed in percentage 
of axial length: 
CFotallenoth axial snout total tips sc. ce. ee omemrses | LOU) 
From snout to centre of orbit,..... Sate, Gein eRe esse oie ast ane 
4 himndend“of mandibles: tec ceeds sce leet 
i ORIS IM OL PECLOLAl stim tyes eee es Veena 
ca tip of pectoral (measured axially i Slee se 
. caudad margin of pectoral... 2... ...%.. 5 Sse 
OMe in-OL Vemcral, sig. 2.5 ces hi na ceent eee apace DT 
re tip of.ventral. ioc. 2:%.. He rnc, OR OR AD 61 
i caudad mareineot ventrally... cna) reciente a2 67 
oH anterior margin of caudal, ..... SPeoede ta iete) 29-t 92 
Span of pectoralss 12.25 44). at tid oh cee k Seka ce VEIN, a neeay Se 35 
io) SEVEDURAIS: Laat. el Dtecsheke lacs terete pachalereuedamegts oticompncr mates 
Height of caudal, teeteaare : sare dh shay ee ashi ove lot Se nteeenCteve awahe oan 24 
Greatest appar ent width ‘of tramk; <2 5,00 sheets Seria te leend. «ate 
Proximo-distad lensth"or pectoral, iis oe emer «ie 6 ste te . 14 
oe co ventral: os 3 acters. « Cote ae eee 
In contrasting newberryi with fylert the distance from orbit 
centre to origin of pectoral fin may conveniently be taken as a 
unit of proportional measurement. In terms of this unit of pro- 
portion the percentage distances of both species may first be 
determined. 
