68 A. Alcock — Carcinological Fauna of India. [No. 1, 



cristatus A. M. Edw., Hypocoelus rugosus Henderson, Cycloxantlius lineatus 

 A. M. Edw., Halimede thurstoni Henderson, Cymo tuberculatus Ortmann, 

 Pilumnus labyrinthicus Miers, Actumnus verrucosus Henderson, Actumnus 

 midus A. M. Edw., Heteropanope eucratoides Stimpson, Eurycarcinus 

 maculatus A. M. Edw. 



The new species described in this paper have almost all been 

 obtained by the " Investigator " and will be figured in the Illustrations 

 of the Zoology of the Investigator for the year 1899, the original drawings 

 for which are now in course of preparation. 



Tribe CYCLOMETOPA. 



Cyclomdtopes Milne Edwards, Hist. Nat. Crust. I. 264, 363 (part.) 

 Cancroidea, Dana, U. S. Expl. Exp. Crust, pt. I. p. 142 (part.) 

 Cyclomttopes, A. Milne Edwards, Ann. Sci. Nat., Zool., (4) XIV. 1860, p. 183. 

 Cyclometopa or Cancroidea, Miers, Challenger Brachyura, p. 106 (part.) 

 Cancroidea Portuninea and Cancroidea Cyclometopa (part.) Ortmann, Zool. 

 Jahrb., Syst.*VIl. 1893-94, pp. 65 and 411. 



Carapace, almost without exception, broader than long, the antero- 

 lateral borders generally arched, sometimes very strongly so, the postero- 

 lateral borders generally convergent, sometimes very strongly so : the 

 front broadish or broad, horizontal or obliquely deflexed, not rostrate. 



Buccal cavern square-cut, commonly broader than long : the palp 

 of the external maxillipeds articulating at or near the antero-internal 

 angle of the merus. 



Epistome transverse, short fore and aft. 



The antennules generally fold nearly transversely. 



The abdomen of the male occupies all the space between the last 

 pair of legs. 



Branch!® nine pairs ; their efferent channels opening on either side 

 of the palate. 



The genital ducts of the male open at the bases of the last pair of 

 legs. 



The Cyclometopes of Milne Edwards includes the genus (Ethra 

 which, following Miers, has been relegated to the Oxyrhyncha in this 

 series of papers, and excludes the Telphusidse, which by all subsequent 

 writers have been regarded as true Cyclometopes. 



The Cancroidea of Dana includes the genus Acanthocyclus. My 

 only knowledge of this genus is derived from drawings and descriptions, 

 which do not as yet satisfy me that Acanthocyclus is more nearly related 

 to the Cyclometopes than to other groups. 



The Cyclometopa of Miers includes not only Acanthocyclus, but, 



