ON THE AUSTRALIAN LUNG-PISH. 



607 



is more rudimentary than in Zschokkeella. I should distinguish 

 the various genera thus : — 



I. Excretory system forms a network in each segment. Recep- 



taculum seminislong and forming end of vagina. Cirrus sac 

 small. 



A. Genital pores median on edge of segment. Testes forming a 



continuous row. No vesicula seminalis. Uterus well 

 developed at first Zschokkeella. 



B. Genital pores posterior on edge of segment. Testes in two 



groups. Large vesicula seminalis present. Seminal ducts 

 form a network. Uterus never well developed. 



Inermicapsifer. 



II. No excretory network. Receptaculum short and globular 



along the course of vagina. Cirrus sac rather large. 

 A, Genital pores on conspicuous papilla. Testes forming 

 continuous row. Uterus never well developed. 



ThysanotcBnia. 



This arrangement is naturally only tentative, since we are at 

 present in need of more information concerning the majority of 

 the species already known from the Hyrax and enumerated by 

 Janicki in the paper which has been so often referred to. There 

 are also points in the structure of the species referred to the genus 

 Zschokkeella which demand further investigation. 



32. Additional Notes on the Living Specimens o£ the 

 Australian Lung-fish (^Ceratodus for steri) in the Collection 

 o£ the Zoological Society of London. By Bashford 

 Dean.* 



[Received February 9, 1912 : Read April 2, 1912.] 



(Text-figures 84 & 85.) 



Index. 



Page 



Development and Coloration 608 



Regeneration of injured portion 611 



The two specimens of the Australian Lung-fish in the Zoolo- 

 gical Society's collection have been living under unchanged 

 conditions since 1898, i. e. about fourteen years. In this time 

 they have been observed repeatedly by zoologists, whose interest 

 in these important and rare batrachian-like fishes has led them, 

 in several instances, to publish their notes in detail. There 

 is still, however, much to learn about the habits of these 

 fishes, and it is to be hoped that the opportunity will be 

 seized generally to observe the present specimens, especially 



* Communicated by the Seceetaet. 



