t84 



J. G. DE Man : Sesnnna thelxinoe. 



[Vol. II, 



pair of legs 



r 



J 



L 



137 



1275 



6-8 



14-4 



7 



2-5 



1-8 



27 

 4-6 



1-52 



io'4 



57 



5-5 



io"4 



3"2 



7 

 1-8 



6-5 



2 

 1275 



I2'4 



e.g., are the meropoLiites of the penultimate pair three times as 

 long as broad. The carpal joints, which, like the following joints, 

 are smooth, are furnished on their outer surface with two longitu- 

 dinal ridges, less distinct on those of the last pair. The propodites 

 are little more than three times as long as broad, and the dactyli 

 are but little shorter than the penultimate joints ; in the male, 

 not in the female, the posterior margin of the dact3di is tomen- 

 tose, as also the distal third part of that of the propodites. The 

 ambulatory legs are fringed with stiff bristles which are black on 

 their proximal and white on their distal half. 



The carapace and ambulator}' legs are red-brown, the chelipedes 

 yellow. 



Measurements in millimetres. 

 Distance between the outer orbital angles 

 Length of carapace, measured in the 



middle line, abdomen excluded 

 Breadth of the upper margin of the front 

 Distance between the ist epibranchial teeth 

 Greatest width of the carapace . . 

 Breadth of posterior margin of carapace . . 

 Length of the terminal joint of abdomen. . 



,, ,, penultimate joint 

 Breadth of the anterior margin of this joint 



,, „ posterior ,, ,, „ 

 lycngth of antepenultimate joint 

 Horizontal length of chela 



,, lingers 

 Height of the palm 

 Length of meropodite "~^ 

 Breadth ,, | 



Length of propodite [ of penultimate 



in the middle 

 Breadth of ,, ,, 

 Length of dactylus 



6 

 5 



75 

 5 



IT 



6 

 12 



13 

 6 



775 



JL 



3-8 



9 



3 



6 

 1-9 



575 



5 

 4 



75 



5 

 6 



6 



17 

 575 



Sesarma thelxinoe differs at first sight from S. ocypoda, Nob., 

 its variety gracillima, de M., and 5. sylvicola, de M., by the smooth- 

 ness of the gastric region and of the upper surface of the inner post- 

 frontal lobes, as also by the smoothness of the outer surface of the 

 chelse. There are, however, still more differences, for which I 

 refer to my work in Abhandl. Senckenh. Naturf. Gesellsehaft, xxv, 

 1902, pp. 522-527, pi. xix, figs. 9-1 1. 



Of S. aranea, Nob., a young male specimen, from the Island 

 of Nias, kindly presented to me by Dr. Nobili, is lying before me. 

 The distance between the outer orbital angles is 6*3 mm., the 

 length of carapace 6 mm., and the lateral margins slightly diverge 

 posteriorly, so that, as regards the general shape of the carapace, 

 both species agree with one another. The first epibranchial tooth 

 is, however, shorter than the extraorbital tooth and less prominent 

 laterally ; the upper surface of the inner post-frontal lobes and 



