243 



as small, still unpigmented eels (montee) the mouth of rivers, 

 changing here in small pigmented eels and ascending the rivers. 



Fig. 99. Anguilla celebesensis Kaup. 



Distribution: Widely distributed over the world, but not 

 extending into the arctic and antarctic regions and wanting 

 on the west-coast of Africa, on the Pacific coast of America 

 and on the Atlantic coast of South-America. 



Fig. 100. Dentition of Anguilla mauritiana Benn. 



a upper jaw with vomerine and maxillary teeth, b lower jaw; the mandibulary 

 and maxillary teeth with a longitudinal edentulous groove, nat. size. 



Key to the indo-australian species of Anguilla. 



I. Distance between origin of dorsal and anal more than 

 half length of head. 



A. Maxillary and mandibulary band of teeth longi- 

 tudinally divided by an edentulous groove. 



1. Origin of dorsal nearer to anus than to gill- 

 opening A. elphinstonei p. 244. 



2. Origin of dorsal nearer to gillopening than 



to anus A. mauritiana p. 245. 



B. Maxillary and mandibulary band of teeth without 

 an edentulous groove. 



1. Mouthopening reaches in the young the hind- 

 border of eye, when fullgrown to about I eye- 

 diameter behind eye A. cdcbcsensis p. 247. 



2. Mouthopening reaches even in the adult the 



hindborder of the pupil only A. malgumora p. 248. 



