OSTEOLOGY OF HEMIBRANCHIATE FISHES— STARKS. 



633 



The Shoulder Girdle of ^oliscus strigatus. 

 centriscid.e. 



The shape of the cranium resembles that of 3Iac?rjrhm7iphosiis. being 

 wedg-e-shaped as viewed from above and vertically truncated pos- 

 teriorly. 



On its superior surface are five narrow wedge-shaped ])ones, The 

 longest is the supraoccipital. About half of its length separates the 

 posterior part of the frontals. On each side of it are the epiotics, of 

 the same width l)ut shorter. Anteriorly they cut a V-shaped piece out 

 of the end of each frontal. The posttemporals are the most lateral and 

 the shortest of these bones. They cut a V-shaped piece from the ends 

 of the pterotics. On the superior-lateral surface of the cranium the}^ 

 are remote from the epiotics, but on the posterior surface the}^ send a 

 process up to them. 



Fig. 6.— Right shouldei 



ik ^koi.iscus strigatus from inner side. for lettering see 

 Fig. 4. 



The parietals and opisthotics are absent. The articular facets of the 

 exoccipitals are at the extreme lower part of the cranium below the 

 middle of the basioccipital cond3'le. The exoccipitals show no tendenc}' 

 to approach and join over the basioccipital. 



The myodome appears to be wholl}^ absent. 



The supraclavicle shows externally as a long, narrow, ganoid bone, 

 extending horizontally. It is enlarged anteriorly and is concave at its 

 end for the reception of the end of the posttemporal. It laps over the 

 edge of the clavicle somewhat and is lirmly attached by a simple suture. 



Directly above is a somewhat similar ganoid plate attached along 

 the edge of the supraclavicle by a smooth inconspicuous suture. It 

 extends farther back than the supraclavicle and appears to be one of 

 the series of lateral plates. Both it and the supraclavicle attach by 

 dentate suture to the wide lateral plate behind it. Above these are 

 the median plates of the ])ack. 



