CRUSTACEA OF THE MERGUI ARCHIPELAGO. at 
antero-lateral spine, which in the typical specimen is the same 
- gize as the third, and in which it is directed slightly forward and 
upward. I, however, regard this small difference only as sexual, 
local, or individual. 
As regards Doclea hybridoida, Blkr., I suppose it to be a mere 
variety of Doclea hybrida, characterized by the rudimentary state 
of the tubercles of the branchial regions. 
Doclea hybrida having been recorded also from the coast of 
Coromandel, would appear to inhabit the north-eastern part of 
the Indian Ocean. 
2. DoctEs ANDERSONI, n.sp. (PI. I. figs. 1 &2.) 
A single adult specimen was collected at Sullivan Island, 
together with the preceding species. 
This new species closely resembles the Doclea figured by Seba 
(Thesaurus &c. t. i. p. 41, tab. xvi. fig. 4), and I suppose it to 
be the same. The specimen from Sullivan Island, however, 
does not agree with Bleeker’s description of Doclea Seba, Blkr., 
a species founded upon the same figure, as its upper surface 
is not armed with spines. Bleeker has pointed out that whereas 
the specimens he referred to D. Sebe¢ had spines, these structures 
are not found in the figure given in the ‘ Thesaurus.’ 
The cephalothorax is 29 millim. long (without the rostrum and 
the posterior spine) and 30 millim. broad (without the lateral 
spines). Presenting thus the same circular form as Doclea hybrida, 
our species at first sight may be distinguished by its much lower, 
less convex, more depressed cephalothrax. The cephalothorax, 
which in D. hybrida is semiglobular, in our new species is more 
disk-shaped. The whole (upper and under) surface is densely 
covered with a short woolly down. The rostrum has the same 
form and size as that of D. hybrida, extending as much forwards. 
The antero-lateral margins are armed with four rather acute short 
spines, which are arranged in the same manner as in the pre- 
ceding species; the three anterior ones are nearly equally long, 
viz. 2-23 millim., but the posterior tooth is a little longer (83 
millim.) and directed slightly forward and upward. This latter 
spine measures about half the breadth of the base of the rostrum 
(the transverse line that unites the internal angles of the supra- 
orbital fissures). The posterior margin of the carapace is armed 
with a median acute spine, directed backward and slightly upwards, 
which is nearly as long as the last antero-lateral spine. Though 
