MARINE CRUSTACEANS. 205 
the hand two distinct ridges, with another less distinct above them; on the upper side two 
pairs of spines. Fingers as long as palm, slender, hooked at tip, grooved within and without. 
(11) Line between 6th and 7th abdominal terga very slightly concave. 
(iv) Habitat the shore (2). 
Length 10 mm.; breadth 13 mm. 
Colour in spirit, ochreous yellow. 
One male from Goidu, Goifurfehendu Atoll. 

Fic. 36. Thalamita gardineri; a. outside of chela, 
12. Thalamita gardineri n. sp. 
The ewetastica group of Thalamita approach Charybdis in some respects. The present 
species is allied by its features both to Charybdis and to the ewetastica group. From the 
latter it 1s sundered by the following characters: 
(i) The transverse ridges of the carapace are disposed as in 7’. exetastica but are rather 
more prominent than in the type variety. 
(ii) The antero-lateral edge slopes outwards, making a greater angle with the middle 
line of the body than in 7. ewetastica. 
(iii) The median frontal lobes are distinctly narrower than the submedian (2: 3), and 
on a lower plane than, though not overlapped by, the latter. 
(iv) The last side-tooth projects much more than the rest, and is as long as the 2nd 
or 3rd, though not so broad. The 4th side-tooth is small, but not rudimentary, There is 
no small tooth at the base of the first side-tooth, 
