Waite — Fishes of South Australia 9 



Family CARAGOLIDAE. 



CARAGOLA Gray, 1851 (lapicida). 



CARAGOLA MORDAX Richardson (Short-headed Lamprey). 



Pfitromyzon mordax Rich., Zool. Ereb. and Terr., 18-1-8, p. 62, pi. xxxviii, fig. 3-6. 

 Mordacia mordax Gray, Chondropt., 1851, p. 144, pi. i, fig. 6 and P.Z.S., 1851, 

 p. 240, pi. iv, fig. 6 ( mouth ,^ ; Ogil., P.L.S., N.S.W., xxi, 1896, p. 400. 



Fig. 4. CaragoJd inorddx. 



Before the construction of the weir this lamprey was very common in the 

 River Torrens, which it ascended for breeding pnrposes ; it is occasionally washed 

 up on the ocean beaches. 



Class PISCES (Fishes). 



a. Skeleton cartilaginous, skull without membrane 



bones (opercles, suborbital ring, etc.) ; males 



with paired claspers. 



b. Gills with five to seven separate external 



openings 



bb. Gills with a single external opening . . . , 



aa. Skeleton usually l)ony, skull with membrane 

 bones ; males without paired claspers . . . . 



Elasmobranchii 

 (Sharks and Rays) 



HOLOCEPHALI 



(Elephant Fishes) 



Teleostomi 

 (True Fishes) 



Sub-Class ELASMOBRANCHII (Sharks and Rays). 



a. Gill-oi)enings on the sides; pectorals free from 



the head Selachii 



(Sharks) 

 ay. Gi]l-o])enings on the lower surface; pectorals 



attached to the head ; no anal fin Batoidei 



(Rays) 



