30 



Records of the Indian Museum. 



[Vol. XXII, 



rdle 



an abnonnal 



T EXT-KiG. 2. — Musculature and skeleton of the pectoral 

 specimen of Rita rita (Ham. Buch.). 



1. Muscles of the pectoral fin seen from abo\-e. 



2. Muscles of the pectoral fin seen from below. 



3. Skeleton of the pectoral arch seen from below. 



(7 -— muscle attached above the base of the condyle of the spine. This pulls 

 the spine outwards thus expanding the fin ; 6 = muscle that pull s the spine in- 

 wards, thus folding the fin ; c := pulls the spine outwards; d =■ folds the fin ; 

 e = abductor muscle ; /"= adductor muscle ; g^ nodule of bone ; li = cubito- 

 humeral process ; a.g. = articular groo\e ; p.g. = primary should er girdle ; s.g. 

 :=.secondary shoulder girdle ; /; = notch in the cubito-humeral process ; 5 ^ 

 spine ; c', c" = canals lor the p.issage of muscles. 



