56 Proceedings of the Royal Physical Society. 



The atloid consists of nasal 23, cartilage 24, rhinal 25. 



Before concluding this hasty communication, the atten- 

 tion may be directed to prepared disarticulated crania of the 

 cod, as representing the osseous fishes. 



I. That by Mr Flower of London, according to the views 

 of Professor Owen . 



IL That prepared by Mr Davies, of the Natural History 

 Museum, Edinburgh, according to the system advocated in 

 this paper. 



It will be seen that in the No. I. Professor Owen has 

 omitted the occipital vertebra altogether, having mistaken 

 it for the atlas, but as it closes in the par-encephalic or 

 cerebellar cavity, as shown in No. II. in its proper rela- 

 tion with the distinct cranio-vertebral characters. This, of 

 course, renders the numbers used by Professor Owen in- 

 correct, as may be seen by referring to the tables where the 

 names adopted in this paper are so arranged as to show the 

 synonyms of Owen, Huxley, Bertrand, and the Nos. of 

 Cuvier, where the homologous bones, according to the dif- 

 ferent authors, can be identified. (See Table, p. 49.) 



On the Thoracic Zones and Limbs of Osseous Fishes. 



The temporal zone 46-48 inclusive, and its limb, is at- 

 tached to the anterior margin of the scapula 53, described 

 as the tympano-mandibular arch (Owen) ; the scapula or 

 epitympanic (Owen) — the suspensorium (Huxley) — sup- 

 porting the opercular bones of fishes. 



The temporal of Cuvier will be found to represent the 

 mammal temporal as well as the scapula, advanced and 

 articulated with the mastoid (10). It is more varied in its 

 shape, and, besides the coracoid and glenoid processes for 

 the union with the clavicle (54) and the brachium (55), it 

 projects another forward to support the temporal 46, 47, 

 and the condyle maxillai (49), all connected by squamous 

 suture. 



Professor Owen has hazarded a wilder homology in regard 

 to the pectoral fin of the ichthyologist. In this he follows 



