2 RPOLIA ZEYLANICA. 
Appended was a list of the sorted specimens :— 
44 1. Twelve errant isopods, epizootic upon the colonies of 
boring isopods and tubicolous amphipods. 
“ 2. Boring isopods. 
44 3. Tubicolous amphipods. 
44 4. Four crabs. 
44 5. Dark gray errant 4 epizootic’ amphipods. 
44 6. One blue-green alpheid. 
44 7. 4 Epizootic ’ tanaids, with some gravid 
The accompanying labels gave the locality as Lake Negombo. 
The collection proved upon examination to contain altogether ten 
species. In English waters a comparable society of crustaceans 
that penetrate the fibres of submarine timber includes the amphi- 
pod Ghelura terebrans , Philippi; the tanaid now known as Tanais 
cavolinii , Milne-Edwards; and the isopod Limnoria lignorum 
(J. Rathke), with which others are from time to time found in 
company. Monsieur Chevreux has found no less than twenty- 
three species of amphipods residential upon the crab Mamaia * 
squinado , though probably nothing like that number on any one 
individual. To Dr. Willey’s timber-haunting group I assign the 
following names :—No. 4, Baruna socialis , n.sp.; No. 6, Alpheus 
heterochelis , Say ; No. 7, Gyathura pusilla , n.sp., accompanied 
by a single Tanais philetcerus, n.sp. another specimen of which 
occurred with No. 3 ; No. 1, Girolana willeyi , n.sp., accompanied 
by a single specimen of Gorallana nodosa , Schiodte and Meinert ; 
No. 2, Spliceroma terebrans , Bate, accompanied by specimens of 
the minute Iais pubescens , Dana; No. 5, Melita zeylanica, 
n.sp.; No. 3, Corophium tricenonyx, n.sp. The ten species accord¬ 
ingly represent ten genera, distributed over ten families in four 
principal divisions of the Malacostraca. 
BRACHYURA. 
GATOMETOPA. 
Family : GRAPRID^. 
1886. Grapsidce , Miers, Challenger Brachyura, Reports, vol. 
XVII., p. 252. 
1900. Alcock, Journ. Asiatic Soc. Bengal, vol. LXIX., pt. 2, 
pp. 283, 389. 
Alcock remarks that this family consists of 44 littoral (rock- 
haunting), or pelagic (drift weed- and timber-haunting), or estua¬ 
rine and paludine, or fluviatile, or rarely terrene Catometopes.” 
* For explaining this change from a pre-oecupied name use is being made of 
an opportpnity more suitable than the present. 
