62 HIALMAR RENDAHL 



List of the species collected by Mr. K. BaCKSTROm, zoologist to the 

 Swedish Expeditiott. 



1. Gymnothorax obscurirostris n. sp. 



One specimen, 260 mm. 



Head, measured to gill-opening, 9,6 in total length, 4,4 in length to anus; 

 height 1,8 in head; snout 6,4; cleft of mouth 2,7; eye 9,6; interorbital region 

 6,9; eye 1,4 in the latter and 1,5 in snout. Ethmovomerine teet (»intermaxillary 

 teeth» auctt.) 12 (or 14?) in number, uniserial anteriorly, laterally on each side 

 with about 5 small teeth forming an outer series close to the inner one. In 

 the mesial line of the upper jaw three large, depressible fangs, behind these 

 about five short and very blunt teeth in a series on the vomer. Palato- 

 pterygoid teeth (»maxillary teeth» auctt.) biserial: the outer row composed of 

 ten triangular, rather compressed teeth of moderate size, the inner one of five 

 tall and slender teeth. Symphysial part of mandible armed by two rows of 

 teeth, about six teeth in each row. Laterally a single row of compressed, 

 triangular teeth, nine in number. Anterior nasal tentacles short. Gill-opening 

 somewhat wider than eye. Upper profile of head rather strongly elevated 

 behind the eyes. No scale-pouches. 



Colour in spirits yellow, marbled with yellowish brown and marked with 

 irregular and partly confluent dark brown spots. Snout and interorbital region 

 uniform dusky. 



This species evidently is very nearly allied to G. thyrsoidea Rich., from 

 which it i. a. may be recognized by its different dentition (biserial ethmo- 

 vomerine teeth laterally, comparatively fewer teeth, etc.) and perhaps also by 

 a more restricted extant of the dark part of the fore-head. In a specimen of 

 G. thyrsoidea before me the postocular part of the dark area in question is 

 more than 2 times the length of the snout, whereas in the type-specimen of 

 G. obscurirostris it is restricted to the snout and the interorbital region. 



2. Belone platyura Bennet. 



One specimen, about 610 mm (s. c). 



Measurements of the specimen: Head (from tip of upper jaw) 3,9 in total 

 length (s. c); eye 8 in head, i ^/4 in postocular part of head, 0,9 in* bony 

 interorbital space and i,a in interocular region (measured between upper margin 

 of eyes); snout (tip of upper jaw to anterior border of eye) i ^/a in head; 

 postorbital part of head 4,6 in total length of head. Length of pectoral about 

 I ^4 length of postocular part of head. D. 14; A. 19. Very few scales on 

 head; cheeks and opercles mostly naked. The scales may have been lost, as 

 also the present ones are very deciduous. 



3. Myripristis pralinius Cuv., Val. — Kendall and Radcliffe, 

 1. c. p. 90. 



One specimen, 168 mm (s. c). Bought in preserved state on Easter Island. 



D. X.— I. 1472; A. IV. 12 V2; 1. lat. 38, 1. tr. ^/t. Depth in length 

 2,4; head in length 2,8; interorbital space in head 3,9; eye in head 2,22; eye 

 in interorbital space 0,56; eye in snout 0,47. 



