CRUSTACEA OF THE MERGUI ARCHIPELAGO. 129 
The ambulatory legs are similar to those of IZ. quadratus, and 
their margins are clothed with some hairs. The meropodites of 
the legs of the third and fourth pair are armed on their upper 
margin, a little before the distal end, with an acute spinule, but 
those of the second and fifth are unarmed. The meropodites are 
minutely denticulate along the distal half of their under margin, 
especially those of the legs of the third and fourth pair; this 
denticulation, however, is so minute that it is only visible by 
means of a strong magnifying-glass. 
Dimensions :— 
BE Or 
millim. millim. 
Distance between the external orbital 
nngles 2.6 iG ee ice ee eee eee 9 = 11 
Distance between the second antero-lateral | 
Heath 05 | (Aaa 94 112 
Length of the cephalothorax .......... 63 73 
Breadth of the front, between the eye- 
OSCIMONG ee ees tes Gee oe ae aa een 2 24 
Length of the hand (fingers included).... 8 Az 
Genus Dorinya, Stimps. 
I propose to unite this with the genus Scopimera, de Haan, 
as the two present distinct natural affinities; they not only 
resemble one another as regards their outer appearance and 
their essential characters, but both are provided with the sin- 
gular “ tympana”’ on the meropodites, rarely also on the sternum, 
which, so far as [ am aware, are not found in any other Crus- 
tacea. De Haan separated the Scopimere from the Dotille 
on account of the merus-joint of the outer maxillipeds being 
longitudinally sulcate in the Dottlle and smooth in the Scopimere. 
This character, however, is now proved to be only of specific 
value by a new species in the collection. The form in question 
agrees closely with the true Dotzlle, and more especially resembles 
Dotilla sulcata ; but the merus-joint of the external maxillipeds 
shows only partially the longitudinal grooves characteristic of 
Forskal’s species. 
Three species of Dotzlla have hitherto been described: the long- 
known D. sulcata, Forsk., from the Red Sea, D. myctiroides, 
M.-Edw., from the coast of Malabar, and D. fenestrata, Hilgend., 
from the eastern coast of Africa, 
LINN. JOURN.—ZOOLOGY, VOL. XXII. 9 
“ep sh) => 
a 
