Crustacea Decapoda and Stomatopoda. 
223 
forty-seven forms being represented. At the mouth of the Patalung river and in 
the inner of the two lakes of which the Tale Sap is composed, the water was fresh 
at the time when the collection was made and probably remains so throughout the 
year. In the channel between the two lakes and in the outer lake it was brackish, 
specific gravities falling between 10015 and 1-0085.' 
The following species were obtained in these two regions : — 
PataIvUng River and inner i,ake of Tai,e Sap. 
Fresh water. 
Paratelphusa (Paratelphusa) germaini 
(Rathbun). 
Palaemon carcinus, Fabricius. 
,, lanchesteri, de Man. 
Palaemon elegans, de Man. 
Caridina propinqua, de Man. 
,, gracillima, Lanchester. 
„ nilotica, subsp. macrophora, nov. 
Outer i^ake of Tai.e Sap and channel between lakes. 
Brackish water. 
Rhynchoplax exiguus, Kemp. 
Gelasimus annulipes, Latreille. 
Dotilla wichmanni, de Man. 
Campfandrium sexdentatum, Stimpson. 
Grapsus strigosus (Herbst). 
Metopograpsus messor (Forskil) . 
„ wacw/a^ws, Milne- Edwards. 
Varuna litterata (Fabricius). 
Sesarma quadratum (Fabricius). 
haswelli, de Man. 
„ taeniolatum, White. 
„ siamense, Rathbun. 
Pilumnus quadridentatus, de Man. 
Scylla serrata (Forskdl). 
Neptunus pelagicus (Linn.). 
Charybdis crucifera (A. Milne- Edwards) . 
,, affinis, Dana. 
„ callianassa (Herbst). 
Ehalia heterochalaza, sp. nov. 
Philyra sexangula, Alcock. 
olivacea, Rathbun. 
Dorippe astuta, Fabricius. 
Clibanarius longitarsis (de Haan). 
Diogenes avarus, Heller. 
Upogebia (Upogebia) heterocheir, Kemp. 
Palaemon carcinus, Fabricius. 
„ sundaicus (Heller), de Man. 
Alpheus paludicola, Kemp. 
Caridina propinqua, de Man. 
„ gracillima, lyanchester. 
Penaeus indicus, var. merguiensis, de Man. 
carinatus, Dana. 
Penaeopsis monoceros (Fabricius). 
„ affinis (Milne-Edwards). 
„ brevicornis (Milne-Edwards). 
Acetes indicus, Milne- Edwards. 
,, japonicus, Kishinouye. 
Lucifer hanseni, Nobili. 
Squilla scorpio, lyatreille. 
,, „ var. immaculata, 
,, nepa, Latreille (Bigelow). 
,, interrupta, Kemp. 
Kemp. 
Squilla raphidea, Fabricius. 
It is probable that a considerable number of the brackish-water forms are merely 
casual or seasonal immigrants to the lake and do not inhabit it permanently ; the fact 
I Neatly all the species were found in water the specific gravity of which varied from 1-0035 to ^1-0085 (corrected). 
