cl 
The osteology of Cromeria nilotica and Galaxias attenuatus. 67 
basihyal. Behind these is a separate spatulate cartilage (br. b.4—5) 
lying between the ceratobranchials of the last two arches and thus 
evidently representing the last two basibranchials. Its great width 
anteriorly suggests that the hypobranchials of the fourth arch have 
been incorporated also. Such a view is strengthened by a study of 
the elements immediately in front. Posteriorly it does not extend 
further than the attachment of the fifth ceratobranchials, a fact which 
makes it doubtful whether the fifth basibranchial really exists. 
Fig. P. Internal view of the 
pectoral girdle of Galaxias. 3:1. 
el clavicle, er coracoid, m. cr mesocoracoid, p. el postelaviele, p.t 
posttemporal, ra 1—4 radials 1—4, s. ci supraclavicle, sc scapula. 
N, 
Ses 
Cx 
sec x e i | 
\ BEN 
| | Fig. N. External view of the ye 
\ ) \ se pectoral girdle of Cromeria. 25 : 1. 
PT SS Fig. O. Postero-internal view of = 
pe. the primary part of the same. 50:1. ER 
The pectoral girdle of Cromeria (Fig. N) is attached by the 
greatly elongated arm of a bifurcated post-temporal (pt) to the supra- 
occipital bone. This extraordinary mode of suspension occurs elsewhere 
in the Lyopomi and Iniomi!). The other arm is short and is in no 
way related to the cranium. All the usual dermal elements except 
the postclavicle are present. 
The primary pectoral girdle (Fig. O) is largely cartilaginous and 
of a lowly type. The rodlike coracoid bones are in contact with one 
another anteriorly by means of cartilaginous epiphyses.. The remainder 
of the girdle may be described as rectangular in general outline: 
with the upper half in a vertical plane; and the lower bent nearly 
at right angles to this, and in a more or less horizontal plane continuous 
with the broad end of the coracoid. The hinder third of the upright 
portion is occupied by the scapula; the front, by a fenestra. Rising 
from the horizontal portion is a slender mesocoracoid bone which, 
1) Jorpan, D.S., and Evermany, B. W., Fishes of North and Middle 
America, Washington 1896, V. 1. 
Rx 
D* 
