IOO 



long, the rostrum included, 67 mm. It fully agrees with the cited description and figures. In 

 Fig. 5 of Plate VIII of the "Illustrations" one observes 4 spines between the frontal margin 

 and the hepatic groove, on Plate IV only 3; the 4 lh spine wanting on Plate IV is that which 

 in the other figure occurs just belovv a line that unites the spine at the upper end of the 

 hepatic sulcus with the foremost spine just behind the frontal margin. The male from the Bali 

 Sea carries on the left side 3 spines exactly as on Plate IV, but on the right a 4 111 spine occurs 

 immediately behind the foremost one, a spine of the same size : this 4 th spine seems to be the 

 same which in Fig. 5 of Plate VIII is seen somewhat posterior to the foremost spine, in the 

 same horizontal line, just in front of the hepatic groove. Behind the cervical groove the animal 

 presents, at each side of the median carina, three ridges, like in Nephr. Tkomsoni, Nephr. 

 Challengeri and Nephr. Sibogae: it is, of course, an individual abnormality, that the 2 nd ridge, 

 both on the right and on the left side, does not end anteriorly in a spinule. 



The legs of the i bt pair are equal, 109 mm. long, and comparatively somewhat shorter 

 with regard to the whole length than in the adult male figured on Plate IV, a difference probably 

 owinfj to the difference of age. 



Nephr. andamanicus now may easily be distinguished from Nephr. Tkomsoni Sp. Bate, 

 Nephr. Challengeri Balss and the new Nephr. Sibogae by the more prominent and 

 more conspicuously de n tic u late d ridges on the chelae of the anterior legs 

 and by the more strongly sculptured abdomen. In Nephr. Tlwmsoni indeed 

 (H. Balss, Ostasiatische Decapoden II, München 1914, PI. I, Fig. 1) the terga of the 2 nd — 5 th 

 abdominal somites are marked only with a single, though deep, transverse groove, which is 

 broadly interrupted in the middle, while in the two other species the abdomen appears smooth 

 and shining to the naked eye : in Nephr. Challengeri the somites of the pleon are described 

 by Spence Bate as "smooth and free from the transverse depressed line that is conspicuous" in 

 Nephr. Tkomsoni, in Nephr. Sibogae, finally, one observes (PI. IV, fig. 18) only a transverse row of 

 shallow impressed puncta, also broadly interrupted in the middle. There are, however, still other 

 differences. In Nephr. Tkomsoni four spinules are observed on the posterior margin of the hepatic 

 groove between the hepatic spine and the spine at the upper end of this groove (C. Spence 

 Bate, Report Challenger Macrura, PI. XXVI, fig. 1), in Nephr. andamanicus, Nephr. Sibogae 

 and probably also in Nephr. Challengeri these 4 or 5 spinules are wanting at all. The fïattened 

 ridge along the posterior margin of the carapace appears in NepJir. andamanicus less broad in 

 the middle than in the three other species. The scaphocerite of the outer antennae has about 

 the same form in three species, being regularly rounded on the inner margin and hardly longer 

 than broad, but in Nephr. Challengeri it appears distinctly longer. In the male of Nephr. 

 andamanicus from the Bali Sea the antennal scale is g 1 /^ mm. long and 7^ mm. broad; in a 

 male of the same size of Nephr. Sibogae from the Kei-islands the scaphocerite is g l /„ mm. 

 long and 8 mm. broad. The rostrum of Nephr. andamanicus appears a little broader 

 between the eyes than in Nephr. Sibogae and the two sub-dorsal ridges on the gastric region 

 are also a little farther distant from one another than in the new species that was taken 

 near the Kei-islands. The cervical groove is situated a little more forward, so that that 

 part of the carapace which is lying behind the groove, appears a little longer in proportion 



