194- EL EMENTAR Y ANA TO MY. [LESS. 



pectoral girdle. In some Fishes, as e.g. the Angler (Lophius), 

 the ossa innominata are articulated directly with the hinder 

 border of the clavicles, while in other Fishes they very often 

 are but little removed from them. Fishes in which the 

 hinder limbs are placed far forwards are called thoracic 

 (as the Perch), and when still more so, jugular (as the 

 Cod). 



Rarely, as e.g. in the Opah Fish (Lampris), the os innomi- 

 natum joins the coracoid, which in this species is enormously 

 enlarged. 



FIG. 166. PELVIS OF ECHIDNA. 

 z7, ilium ; w, marsupial bone ; /, pubis ; s, sacrum. 



ii. Certain bones called MARSUPIAL BONES, of which no 

 ossified representatives exist in man, may be attached to the 

 pelvis. Thus, in him the internal tendon of each external 

 oblique muscle is neither ossified nor chondrified. In all Mar- 

 supials, however (except the Thylacine, or Tasmanian Wolf) 

 and in the Monotremes, these tendons are largely ossified, 

 the ossifications being movably articulated with the brim of 

 the pelvis. Such ossifications constitute the marsupial bones. 

 In the Tasmanian Wolf these parts are represented by carti- 

 lages, but no such structures have been detected in other 

 Mammals, except that there is a slight chondrification of 

 the same part in the Dog. In the Chameleon the brim of 

 the pelvis supports small bony nodules, and in the Ostrich a 

 small bone is attached to the front of the pubis. Possibly 

 <as before said) the so-called pubic bones of Reptiles may 

 be marsupial bones, if they do not rather correspond to 

 ilio-pectineal eminences. 



Another possible ossification which has no representative 



