208 TREUBIA VOL. II, 2—4. 
It therefore seems that the udang tanah lives exclusively in the ground, 
in galleries that reach down into the ground-water. Hence this animal and 
its chimneys may be met with at a fairly long distance away from the 
water’s edge. Thus my amanuensis, Mr. E. C. A. HERBST, found the 
lassina thus lives in the ground. 
In “A Treatise on Zoology”, 
edited by Sir RAY LANKESTER, 
Part VII (2), page 304, one reads: 
hee nde some Crayfishes are 
“found burrowing in the earth 
“far from streams or ponds, their 
een -DUTEOWS reaching down to the 
Hydroporine beetle oc- “ground-water. The same is re- 
curringregularlyamong “ported of the marine or brack- 
the algal masses and ,. A 
highersabmercediagtial ish water Dhalassina”. 
tic plants in the Batavia 
Smpangs. Dorsal View. À Cerithiid (Prosobranchiata 
_Monotocardia) belonging to the 
genus Potamides, subgenus Telescopium, is very 
abundant in the Batavia empangs. The flesh of this 
snail known at Batavia by the Malay name of bel- 
entjong, is used as food by the natives. The empty 
belentjong shells often serve as dwellings for Paguridae, 
I will now add a few more notes on certain 
chimneys of udang tanah at some tens of metres from 
the water’s edge at Bagan Si Api Api (East-coast of 
Sumatra, at the mouth of the Rokkan River). From 
Bagan Si Api Api I received a few specimens of 
the udang tanah that were in every respect similar 
to those drawn from the Batavia empang region. 
It seems to have been noticed before that 7ha- 
Fig. 46. Small, brown 
Hydroporine beetle 
occurring regularly 
among the algal mas- 
ses and higher sub- 
merged aquatic plants 
in the Batavia em- 
pangs. Ventral view. 
DS ZIE, 
animals occurring generally in the empangs among the conglomerates of 
submerged aquatic plants floating at or reaching up 
to just beneath the surface of the water and consisting 
chiefly of Chaetomorpha, as described in Chapter IV 
and illustrated in our photos 2,3, 4, 6, 8,9, 14 and 15 
(Plate VII, VIII, IX, XI, XIV, XV, XXII and XXIII). 
Rinsing a quantity of Chaetomorpha from the 
Fig. 47. Copepodoc- empangs with pond water, and then straining this 
curring among the algal „ond water through plankton gauze, an impression will 
masses and higher sub- 
merged aquatic plants be gained of the fauna contained within the masses 
in the Batavia empangs. i i 
Seen TO need of waterplants in question. 
x 34, It will then appear regularly that besides mosquito 
