2. Halosauropsis Collett. 



(CoiLETT, Result. Campagnes sci. Hirondelle, Poissons, 1896, p. 143). 

 Aldrovandia Goode & Bean, Ocean. Ichth. 1895 (issued 1896), p. 608. 



Head generally with scales, - often few in number - on 

 cheeks, temples and upper part of opercle, none on vertex 

 or snout. Scales of lateral line strongly enlarged and provided 



Fig. 2. Anterior part of Halosauropsis macrochir (Gthr.) and part of the 

 lateral line with luminous organs (after Collett). 



with luminous organs, which are also present in a suborbital 

 and mandibulary series. Head with angular ridges. Base of 

 ventrals united or not by membrane. 

 For distribution see that of the family. 



Key to the indo-australian species of 

 Halosauropsis. 



1. Length of head i to 2 times in distance between 

 head and base of ventrals. Ventrals almost entirely 

 in advance of dorsal. P. with 8 rays. Lateral line with 



20 25 enlarged scales between head and vent. ...//". mediorostris p. 4. 



2. Length of head about equal to distance between head 

 and base of ventrals. Only anterior fourth of ventrals 

 in advance of dorsal. P. with 10 13 rays. Lateral 



line with 30 enlarged scales between head and vent. H. affinis p. 5. 



i. Halosauropsis mediorostris (Gthr.) 



Halosaurus mediorostris Giinther, Challenger Exped. XXII. Rep. Ueep-Sea Fish. 

 1887, p. 239. 



