62 HIALMAR RENDAHL. 
List of the spectes collected by Mr. K. BACKSTROM, zoologist to the 
Swedish Expedition. 
1. Gymnothorax obscurirostris n. sp. 
One specimen, 260 mm. 
Head, measured to gill-opening, 9,6 in total length, 4,, in length to anus; 
height 1,8 in head; snout 6,4; cleft of mouth 2,7; eye 9.6; interorbital region 
6,0; eye I,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. thyrsotdea 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, 1 °/, in postocular part of head, 0,9 in bony 
interorbital space and 1,2 in interocular region (measured between upper margin 
of eyes); snout (tip of upper jaw to anterior border of eye) 17/2 in head; 
postorbital part of head 4,6 in total length of head. Length of pectoral about 
11/4 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, 
tice: ip.900: 
One specimen, 168 mm (s. c.). Bought in preserved state on Easter Island. 
Dera AV. 12 */s; |. lat. 38,1. tr. */7., Depth ieee 
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. : 
