92 



Treubîa Vol. Ill, 1, 



Monthly 



1919 



Nov. 



Dec. 



192 



Jan. 



Febr. 



Mrch, 



April 



May 



June 



Bantam, W. Java. 



Java's le punt . 



Anjer Kidoel. . 



Laboean . . . 



Tjiteureup. . . 



Tjamara . . . 



Lampongs, S. Sumatra, 



Kota Agoeng . 



Poetili Doh . . 



Telokbetong . . 



Kalianda . . . 



548 



240 



424 



147 



304 



513 



92 



131 



281 



161 



435 



257 



286 



146 



60 



38 



369 



594 



912 



281 



372 



148 



223 



168 



. 463 



507 



965 



298 



338 



379 



171 



111 



457 



446 



828 



300 



301 



229 



94 



41 



325 



226 



133 



118 



147 



205 



67 



95 



147 



320 



240 



298 



279 



250 



94 



146 



51 



161 



388 



276 



280 



94 



73 



54 



413 



456 



434 



389 



395 



359 



118 



175 



surface, and a tail the length of which was 2,5 times that of the body. I saw 

 this species lying on the ground as 1 was wading through the shallow part 

 of the -lake in October 1921. I was unable to catch any of these animals. 



Of the Teleostei some have been identified by Dr. SUNIER, viz. 

 Qerres filamentosiis C. V., O. abbreviatiis Blkr., Eqniila ensifera C. V., 

 Apogon 3 species, and one unknown species. 



Besides these species three others have been observed by the author: — 

 One, a big and heavy fish of 0.5 M. in length, bluish along the back with 

 undulating dark stripes on the upper half posteriorly, is apparently Thynnus 

 thiinnina C. V. A smaller fish was seen of about 20 c.M. in length with 

 dark bands on back and sides, probably Therapon jarbua FORSK; the 

 third species, which was much smaller, was impossible to identify. 



It is particularly interesting to note that nearly all these fishes are 

 known to live in estuaries or brackish water (Therapon, Qerres, Apogon) 

 or to ascend rivers (Pristis, Eqiiiila). There also exists a shark, Carcharlas 

 gangeticus M. et H., distributed from India to Japan, which is ascending 

 rivers to above tidal influence, and two species of Raja are recorded 

 from fresh water. 



There is some evidence from the above-mentioned facts, that all these 

 marine fishes haunted the lagoon of 1908 and became imprisoned later 

 on, and that they or their eggs have not got into the lake from the ocean 

 during stormy weather. 



The insects of the lake are of interest because they cannot have 

 invaded the lake as larvae, but had to reach it on the wing. No less than 

 17 species of insects became inhabitants of this lake in about 12 years. 



