264 Dr. A. Giinther on two neio Fishes from Saraioah. 



Figs. 65-69. Anisonema concavmn, n. sp. : all magnified 500 diameters. Fig. 

 65, a dorsal view, the inroUed margin (t) seen through the body. 

 Fig. 66, a ventral view of tig. 65, the base of the gubemaclum 

 (Jl^) covered by the inroUed edge {t). Fig. 67, a profile view 

 of the right side of the body, showing its concavo-convex 

 character. Fig. 68, an end view to show the lateral extent of 

 the covered way from which the ffuhernadmn {ji 2) and the an- 

 terior flageUum [Jl) spring. Fig. 69, a ventral view of an animal 

 which possesses two extra flagella (j?3). It is probably in the 

 incipient stage of fissigemmation. 



Figs. 70-74, Heteromastix proteiforviis, Jas.-Clk. All the figures are 

 magnified 500 diameters. Fig. 70, profile view of the right side 

 of a fully extended animal, the gubemaclum {JP) 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- 

 geUa (JliJP)., and exposing its ventral ciliated furrow (/) to 

 full view. Fig. 74, an end view of the head, with the group of 

 cilia (d) 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, and 

 the flageUuni (Jl) in the distance ; a part of the ventral side is 

 destitute of cilia : 500 diam. 



Figs. 77, 78, Dysteria ijrorcefi-ons, 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 (f^ hk) 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 (JP) in the distance : 600 diam. 



XXXIV. — Description of two new Gohioid Fishes from 

 Sarawak. By Dr. A. GiJNTHER, F.R.S., F.Z.S. 



[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. 

 Neniachilus fasciatus (K. & v. H.), Apocryptes viridis (H.B.)f, 

 Exocoetus oligolepis (Blkr.), Caranx atropus (Schn.), Dussu- 

 mieria acuta (C. & V.), Pristigaster macrognathus (Blla-.), 

 Saiirida argyrophanes (Richards.). Eleotris melanostigma 

 (Blkr.) is not specifically distinct from E. hutis (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 Ivennis der Visch-fauna van 

 Borneo," in Act.'Soc. Sc. Indo-Neerl. 1860. 



t This is not a JSoleophthalmus, to which genus it has been referred by 

 all pre\-ious authors. 



