120 



Transactions. — Zoology. 



Plate XII. 



Fig. V. Internal aspect of suspensorium and lower jaw. 



Fig. YI. „ hj'oid arch. 



Fig. VII. Branchial arches. 



Fig. VIII. Transitions of ribs and intermuscular bones: vevtebrte 1 to 8. 



Fig. IX. First caudal vertebra (haemal spine containing coalesced 

 ribs?). 



Fig. X. First spine of dorsal fin, with interspinous bone, inseparably 

 connected by ring-joint. 



Fig. XI. Interspinous bone ; ring-head of spine ; and cleft head of 

 soft fin ray, with second or distal pterygiophores inter- 

 posed. 



Fig. XII. Sagittal section of swim-bladder, with perforated septum 

 dividing it into two chambers. 



Plate XIII. 

 Fig. XIII. Sagittal section of pig-fish : viscera intact. 



A. Articular. 



An. Angular. 



B 1-4. Brachial ossicles. 



Bpt. Basipterygium. 



B.r.5. 5th branchiostegal. 



BO. Basioccipital. 



C. Clavicle. 



CB. Ceratobranchial. 



Co. Coracoid. 



CH. Ceratohyal. 



Cp 1-4. Branchial copulse. 



C.V.I. 1st caudal vertebra. 



D. Dentary. 

 Dd. Duodenum. 



D.f.r. Soft dorsal fin ray. 

 DS. 1-5. Spines, dorsal fin. 

 EB. Epibranchial. 

 EH. Epihyal. 

 EpO. Epiotic. 

 EO. Exoccipital. 



F. Frontal. 



G. Gonad (undeveloped). 

 HB. Hypobranchial. 

 HH. Hypohyal. 



H. Heart (on auriculo- ventricular 



groove). 

 HM. Hyomandibular. 

 IH. Interhyal. 

 lOp. Fnteropercular. 

 lOS. Interorbital septum. 

 IS 1-5. Interspinous bones of dorsal 



fin. 

 K. Kidney. 

 L. Lachrymal. 

 Li. Liver. 



LPC. Lower post-clavicle. 

 M. Maxilla. 

 Mc. Meckel's cartilage. 

 MP. Metapterygoid. 

 00. Opisthotic. 



Op. Opercular. 



N. Nasal. 



NO. Optic nerve. 



nod. Nodules. 



NOl. Olfactory nerve. 



P. Parietal. 



PB. Pharyngobranchial. 



PE. Parethmoid. 



Pr. Pronephros. 



pcct.r.l. Pectoral fin ray. 



pelv.r.l. Pelvic soft ray. 



PM. Premaxilla. 



POp. Preopercular. 



PP. Ptcrygo-palatine. 



PO. Prootic. 



PtO. Pterotic. 



PS. Parasphenoid. 



PT. Post-temporal. 



PvS. Pelvic spine. 



Q. Quadrate. 



S. Symplectic. 



SBA. Swim - bladder, anterior 



chamber. 

 SBP. Swim - bladder, posterior 



chamber. 

 SW. Swim - bladder (W marks 



position of septnm). 

 SC. Supra-clavicle. 

 Sc. Scapula. 

 SE. Supra-ethmoid. 

 SO. Supra-occipital. 

 SO 2, 8, 4, 5. Suborbital chain. 

 SOp. Subopcrcular. 

 SpO. Sphenotic. 

 Sy. Symphysis. 



UH. Urohyal (articulation fig. G). 

 UPC. Upper post-clavicle. 

 V. Vomer. 

 Va 1-5 ; G, 8. Vertebrje and ribs. 



