250 



Records of the Indian Museum. 



[Vol.. XIII, 



apparently synonymous) and E, longirosiris, Filhol/ both from 

 New Zealand. The position of E. quoyi, Milne-Edwards/ E. mexi- 

 cana, Milne-Edwards^ and E. whitei, Miers,* is doubtful. E. pilosa, 

 A, Milne-Edwards, as already pointed out, is probably a species 

 of Halicarcinus, while E. filholi, de Man, appears to belong to 

 Rhynchoplax. E. minuta, A. Milne- Edwards," whatever it may be, 

 is certainly not an Elamena. 



Elmnenopsis was established by A. Milne-Edwards in 1873 for 

 E. lineatus,'^ a species found in New Caledonia I have seen no 

 specimens of the genus and have not been able to satisfy m^^self 

 regarding its position in the family. It is said to form a link be- 

 tween the Hymenosomatidae and Pinnotheridae. From the des- 

 cription it appears to be related to Rhynchoplax, but the walking 

 legs are much shorter and stouter than in any species of that genus 

 that I have seen. 



The principal characters of the other five genera may be 

 summarised in the following way : — 



I. There is no epistome. [The external maxillipedes are 

 slender and do not nearly dose the buccal cavern. In 

 the abdomen of the male the sutures of all the seg- 

 ments are distinct] 



II. The epistome is well defined and frequently v^-ry long. 

 A. The regions of the carapace are defined by sharp- 

 cut grooves. The ischium of the external maxilli- 

 pedes is not longer, frequently much shorter than 

 the merus. 



1. A rostrum is present and is frequently trilo- 

 bate or tridentate. The dactylus of the ex- 

 ternal maxillipedes is short (normal). 



a. The external maxillipedes are broad and 

 completely, or almost completely, close 

 the buccal cavern. In the abdomen of 

 the male the sutures of all the segments 

 are distinct 



b. The external maxillipedes are slender and 

 do not nearly close the buccal cavern. 

 The 3rd, 4th and 5th segments of the 

 male abdomen are fused and the sutures 

 obliterated 



2. The rostrum is altogether absent. The dac- 

 tylus of the external maxillipedes is abnor- 

 mally long, reaching the hinder limit of the 

 buccal cavern. [The external maxillipedes 

 are very slender and do not nearly close the 

 buccal cavern. In the abdomen of the male 

 the sutures of all the segments are distinct]... 



Hymenosoma, 

 Desmarest. 



Halicarcinus, 

 White i=Hym- 

 eiiiciis. Dana). 



Rhyiicliopla.x, 

 Stimpson. 



Hymenicoides, 



yen. nov. 



i Filhol, loc. cit. supra, p. 403, pi. xlvi, fig. 7 (1885). 



2 Milne- Ed wards, Anu. Sci. nat., ZooL, Paris (i,), XX, p. 223, pi. xi, fig. 



<i853). 



•^ Milne-Edwards, ibid,, p. 224. 



* Miers, Cat. Crust. N. Zealand, p. 52, pi. i, Hg. 4 ( [S76;. 



6 A. Milne-Edwards, Nouv. Arch. Mus. Paris, IX, p. 324, pi. xviii, fig-. 



'^ A. Milne-Edwards, ibid., p. 324, pi. xviii, fig. 4. 



