264 Dr. A. Giinther on two new Fishes from Sarawak. 
Figs. 65-69. Anisonema concavum, n. sp.: all magnified 500 diameters. Fig. 
65, a dorsal view, the inrolled margin (¢) seen through the body. 
Fig. 66, a ventral view of fig. 65, the base of the gubernaclum 
(fi?) covered by the inrolled edge (¢). Fig. 67, a profile view 
of the right side of the body, showing its concayo-convex 
character. Fig. 68, an end view to show the lateral extent of 
the covered way from which the gubernaclum (1?) and the an- 
terior flagellum (77) spring. Fig. 69, a ventral view of an animal 
which possesses two extra flagella (773). It is probably in the 
incipient stage of fissigemmation. 
Figs. 70-74, Heteromastix proteiformis, Jas.-Clk. All the figures are 
magnified 500 diameters. Fig. 70, profile view of the right side 
of a fully extended animal, the gubernaclum (/”) trailing be- 
neath. Fig.71, the same as fig. 70, in a partially contracted 
state. Fig. 72, an individual seen directly from below, with its 
anterior end strongly retracted and broadened. Fig. 73, an ani- 
mal partially contracted and propped up on its tail by its fla- 
gella (fi, 7), and exposing its ventral ciliated furrow (f) to 
full view. Fig. 74, an end view of the head, with the group of 
cilia (cl) on the lower side. 
Figs. 75, 76. Pleuronema instabile, Jas.-Clk. Fig. 75, a dorsal (ventral, 
homologically speaking) view, 1000 diam. Fig. 76, an end view 
of the head; the contractile vesicle (cv) in the foreground, atid 
the flagellum (77) in the distance; a part of the ventral side is 
destitute of cilia: 500 diam. 
Figs. 77,78. Dysteria prorefrons, Jas.-Clk. Fig. 77, a view of the dorsal 
(homologically the ventral) side, the broader valve (v) next the 
eye, and the narrower three-beaked valve (v!, b&) in the extreme 
distance, 600 diam. Fig. 78, a foreshortened view of the body 
as it appears when turned up on its right edge; the head next 
the observer, and the pivot (/#) in the distance : 600 diam. 
XXXIV.—Description of two new Gobioid Fishes from 
Sarawak. By Dr. A. Ginruer, F.R.S., F.Z.8. 
[Plate XII] 
THE Marquis J. Doria has sent to the British Museum a 
collection of Fishes made by him in Sarawak (Borneo). Se- 
veral of the species are new to the fauna of Borneo*, viz. 
Nemachilus fasciatus (K. & v. H.), Apocryptes viridis (H. B.)t, 
Exocetus oligolepis (Blkr.), Caranx atropus (Schn.), Dussu- 
mierta acuta (C. & V.), Pristigaster macrognathus (Blkr.), 
Saurida argyrophanes (Richards.). Eleotris melanostigma 
(Blkr.) is not specifically distinct from H. butis (H. B.), a spe- 
cies ranging from the east coast of Africa to Borneo and 
China. The total number of species known from Borneo 
* See Bleeker, “‘Dertiende Bydrage tot de Kennis der Visch-fauna van 
Borneo,” in Act. Soc. Se. Indole 1860, 
+ This is not a Boleophthalmus, to which genus it has been referred by 
all previous authors. 
