51 



2. Doryichthys caudocarinatus M. Web. 



Doryklitliys caudocarinatus Max Weber, Nova Guinea V. 2. Siisswasserfische, 



1908, p. 229. 

 Doryichthys caudocarinatus Duncker, Mitt. a. d. naturh. Mus. IlamljUig XXXIl. 



1915, P- 51- 



D. 42; A. 3; P. 18 — 19; C. 9; Rings 20+28; subdorsal 

 rings 2 -f 8. 



Body slender, nearly quadrilateral. Shields transversally 

 striated, their keels finely serrated; all the intermedial shields 

 (scutella) of the tail with feeble, narrow longitudinal keels. 

 Inferior cristae of trunk and tail discontinuous ; median cristae 

 of trunk and inferior cristae of tail continuous. The superior 

 cristae of tail begin below origin of dorsal. Operculum with 

 complete longitudinal keel, below it five radiating ridges all 

 finely serrated. Head 7 times in total length (with caudal). 

 Eye about 6^\^ times in head and about 3^4 times in snout. 

 Snout slightly longer than postorbital part of head ; it is 

 somewhat concave with a median crista reaching the level 

 of frontborder of eye and a lateral crista reaching to the level 

 of posterior border of pupil, below their posterior end a curved 

 edge to neck. Occiput with median crista. Tail slightly shorter 

 than trunk and head. Dorsal lower than height of body. 

 Caudal rounded, as long as postorbital part of head. Brownish, 

 with a dark hue, especially on lower surface of tail and on 

 caudal. Length of the single specimen known (a female) 72 mm. 



Habitat: North New Guinea (river Tawarin, fresh water!). 



3. Doryichthys brevidorsalis (de Bfrt.) 



Doryrhamphus brevidorsalis de Beaufort, Bijdr. tot de Dierkundc, Amsterdam, 



igde Afl, 1913, p. 103. 

 Doryichthys brevidorsalis Duncker, Milt. a. d. naturh. Mus. Hamburg XXXII. 



1915, p. 50. 



D. 24; P. 16 — 17; Rings 16 — 17 -r 28; subdorsal rings 1 + 5 — 6. 



Body higher than broad ; ventral carina in the female rather 

 high. Shields rough with transverse ridges, laterally interrupted 

 in the middle by a rather strong longitudinal keel. Edges of 

 body prominent, finely crenulatcd, when young very slightly 

 serrated, those of the tail almost smooth. Inferior cristae of 

 trunk and tail discontinuous; median cristae of trunk and 

 inferior cristae of tail continuous. The superior cristae of the 

 tail begin on the last ring of the trunk. Operculum inflated 



