CRUSTACEA OF THE MERGUI ARCHIPELAGO. 207 
Tribe ANOMURA. 
Family Dromipi1p2. 
Genus Dromiptia, Stimps. 
117. Dromipra UNIDENTATA, Riipp., var. (Pl. XIV. figs. 4,5.) 
Dromia unidentata, Riippell, Beschreibungen und <Abbildungen von 
24 Arten kurzschwinzigen Krabben, 1830, p. 16, Taf. iv. fig. 2. 
Dromidia unidentata, Kossmann, Zoolog. Ergebnisse einer Reise in die 
Kustengebiete des Rothen Meeres, II. Halfte, 1. Lief. 1880, p. 67. 
Two specimens, an adult female and a young male, which 
ought probably to be referred to this species, were collected in 
King Island Bay. 
As I was at first unable to identify them with any known 
species, I sent the female specimen to Dr. F. Richters, of the 
Museum of Frankfort on the Main, for comparison with Rippell’s 
types of D. wnidentata. Dr. Richters kindly compared it with 
them, and informed me that, in his opinion, the female was a 
local variety of D. wnidentata, Riipp., differing from the four 
types of Riippell’s species in the following details :— 
First, the two lateral teeth of the front are more acute and 
more straightly directed forward in the Mergui specimen than in 
those of Riippell, in which they are more obtuse and more 
divergent ; secondly, that portion of the lateral margin of the 
cephalothorax lying between the external orbital angle and the 
cervical suture is more regularly arcuate in Rippell’s typical 
specimens (“ bildet einen volkommeneren Bogen,” as Dr. Richters 
writes) than in the Mergui female, in which the lateral margin 
is more prominent and therefore more angular. 
In Riippell’s typical specimens the inner edge of the mobile 
finger of the hands is indistinctly dentate, whereas in the 
Mergui individual it is armed with five or six teeth. Dr. 
Richters also informs me that the words “superior integer” in 
Riippell’s diagnosis are not quite exact, the inner edge of the 
mobile finger being feebly dentate in all the four specimens in 
the Frankfort Collection. 
With regard to the first difference pointed out by Dr. Richters, 
I would observe that in the young male specimen from Mergui 
