Carcinological Fauna of India, 13- r > 



No one who has examined any of the deep-sea Dorippoids can, I 

 think, find any difficulty in accepting De Haau's comprehensive views 

 of the relations of the Oxystoma. 



For instance, in the Indian genus Cymonomops* (which differs but 

 little from Cyclodorippe), although the general external forni is as 

 plainly as possible that of Dorippe, yet a detailed examination shows a 

 number of Raninoid characters : — The chelipeds are Itaninoid, so are 

 the external maxillipeds (especially in their long narrow merus and 

 short narrow exognath), so are the antennules : the fact also that the 

 afferent branchial openings are not in front of the bases of the cheli- 

 peds is suggestive. In Cyclodorippe, moreover, the oviducts open, as in 

 the Raninidse, on the bases of the third pair of legs. 



We have, in fact, in some of these deep-sea forms the clearest 

 evidence of the close relation of the Ranina type to the Dorippe type, 

 and quite sufficient justification for accepting De Haau's scheme of the 

 Oxystoma almost without modification. 



The following is a list of the known Indian genera of Oxystomes : — 



Calappidse Calappinse : — Calappa, Mursia, Cryptosovia. 



Calappidse Matutinse ■ — Matuta. 



Leacosiidae Leucosiinse : — Acteeomorpha, Oreophorus, Tlos, Hetei'o- 

 nucia (nuv.), Ebalia, Nursia, Nucia, Parilia, RandaUia, Myra, Leucosia, 

 Onychomorpha, Phihjra, Pseudoplulyra. 



Leucosiidse Iliinse : — Myrodes, Iphiculus, Paripliiadus (nov ), Nurs- 

 ilia, Heterolithadia, Arcania, Ixa. 



Dorippidse Dorippinse : — Dorippe, Ethnsa. 



Dorippidse Tymolinee : — Cymonomops. 



Raninidse : — Notopus, Raninoides, Lyreidus. 



Tribe OXYSTOMA or LEUCOSOIDEA. 



Oxystomes, Milne-Edwards, Hist. Nat. Crust. II. 96 tpartim), and Raniniens 

 Milne-Edwards op. cit. II. 190. 



Oxystomata, De Haan, Faun. Japon. Obust. pp. 111-119. 



Leucosoidea vel Oxystomata, Dana, U. S. Expl. Exp. Crust. I. 389, and Ranini 

 vel Anomura Leucosidica, Dana, op. cit. pp. 400, 403. 



Oxystomata or Leucosiidea, Miers, Challenger Brachynra, p. 337, and Raninidea, 

 Henderson, Challenger Anomura, p. 26. 



Oxystomata, Ortmann, Zool. Jahrbuch., Syst., VI. 1892, pp. 550, 551. 



Epistome reduced or absent. The efferent branchial channels term- 

 inate in the middle of the buccal area, the buccal cavern is therefore 

 produced forwards and is generally of an elongate triangular shape ; 

 and the efferent channels themselves, whether covered by the external 

 maxillipeds or not, are immediately closed in by an elongate lamellar 

 process of the exopodites of the first maxillipeds. 



* Illustrations of the Zoology of the ' Investigator,' Crustacea pi. xiv. fig. 9. 



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