THE FISHES 



OF 



SOUTH AUSTRALIA 



KEY TO THE DESIGNATIONS OF FISH-LIKE VERTEBRATES. 



a. No localized brain, no protective skull, no heart . . ACRANIA 



(Lancelets) 

 aa. Anterior end of central nervous axis developed 



into a brain and protected by a skull, heart 



present CRANIATA 



(Lampreys, Fishes and 



higher Vertebrates) 

 b. Nostril single, median ; no mandible, no 



limbs or limb-girdles Cyclostomata 



(Lampreys) 

 bb. Nostrils paired; mandible, limb-girdles and 



limbs usually present, developed as rayed 



fins, gills persistent Pisces (Fishes) 



ACRANIA (Lancelets). 



Family BRANCHIOSTOMIDAE. 



EPIGONICHTHYS Peters, 1876 (cultellus). 



EPIGONICHTHYS BASSANUS Giinther (Southern Lancelot). 



Branchiostoma hassanum Giiuth., Voy. Alert, Zool., 1884, p. 31. 

 Heteropleuron dassaniim Kirkaldy, Q.J.M.S., xxxvii (n.s.), 1895, p. 314, pi. xxxiv, 

 fig. 6. 



Fig. 1*. EingonicJithiis bassanus. 



This and the following species are small transparent marine animals, 

 occurring near the shore and burrowing in the sand. 



* The numbers of the illustrations are not necessarily consecutive, but represent the 

 sequence of the species. 



