316 E. Thurlow Leeds—On Metriorhynchus. 
due to crushing, as all the skulls, except one, have been compressed 
in a similar manner, and therefore only slight discrepancies can be 
ascribed to this cause. 
Wo bee ee Breadth | Breadth | Breadth} Length mae 
| G |pital con dyle. preefrontals. quadrates frontals. prefrontals. in termaxilla 
Gre ta| wore 158 | 190 90 | 90 72 
01 | 670 lol — 92 88 Eete-<00) 
163 | 665 154 185 ia 90 80 
161 655 141 195 94 90 70 
02 | 637 145 196 88 » = SO) 75 
162 630 c. 146 188 ae 90 70 
9 580 134 176 San 80 43 
8 | 578 127 175 75 70 ce. 43 
s sar | 578 127 174 il: 80 45 
mall one | — 98 Tike 50 50 = 
Cast of MZ. | 
superciliosus | — | 158 — 100 96 — 
No. 162 in the above list is of interest, in that the occipital region 
of the skull has entirely escaped crushing. It shows a height of 
98 mm. to the top of the parietal region. The measurements given by 
Dr. Schmidt, viz., length 650, and breadth between quadrates 190, 
agree with the above table. I confess I cannot understand Dr. von 
Arthaber’s measurements. The length of the skull, 603 mm., agrees 
with the skull as figured on pl. xxii, but he gives as the breadth 
across the prefrontals 176 mm., whereas the figure certainly does not 
allow of more than 140mm., which tallies with the above list. The 
measurements from the point of the nasals to the intermaxilla are 
somewhat doubtful, as sometimes the points of the bones are not well 
preserved. 
Pectoral Girdle-—In a paper which he read before the Zoological 
Society of London in 1888, p. 427 ff., the late Mr. J. W. Hulke 
included a description of the pectoral girdle of: IL superciliosus, in 
which, in spite of a protest made at the time by Mr. A. N. Leeds, he 
described a portion of a coracoid as that of a scapula. This and the 
bone which he figures, and correctly so (fig. 2), as a coracoid were 
taken from two different specimens in the Eyebury Collection, both 
IM. superciliosus. 
In the latter bone there is a submarginal foramen in the portion of 
the dorsal end anterior to the glenoid facet ; in the former the foramen 
is represented by a deep notch, which separates the articulating portion 
from the anterior portion, which latter thus forms a projecting process. 
The notch commences from the point where the foramen is situated in 
the perforate variety. An imaginary line drawn across the notch from 
its two corners will show the similarity in the formation of the two 
bones thus :— 
