51 



OxypLEUEODON, Miers. 



Oxypleurodon, Miers, Challenger Brachynra, p. 38. 



The only difference that I can recognize between Oxypleurodon and Spheno- 

 carcinus is that in Oxupleurodon the rostral spines are divergent instead of being 

 approximated. Such a slight difference cannot be of generic value. 



Sphenocarciniis (Oxypleurodon) stimiysoni, Miers. 



Oxypleurodon stimpsoni, Miers, Challenger Braohyura, p. 38, pi. vi. fig. 1 : Anderson, J. A. S. B., Vol. LXV. 

 pt. 2, 1896, p. 106. 



A small male apparently of this species was dredged off Colombo in 180- 

 217 fms. 



Dr. Anderson records the colour of the living animal as orange. 



ScTEAMATHiA, A. Milne Edwards. 



Scyramathia, A. Milne Edwards, Compt. Rend. XCI. 1881, p. 356 : G. 0. Sars, Norwegian North-Atlantic 

 Expedn., Crnst. Ia. p. 5 : S. I. Smith, Albatross Crnstaoea (1884) 188fi, p. 21 : Miers, Challenger Brachynra, p. 25 : 

 A. Milne Edwards and Boavier, Hirondelle Brachyures et Anomnres (Monaco, 1894) p. 12: Faxon, Albatross 

 Stalk-eyed Crust., Mem. Mas. Comp. Zool. Harvard, Vol. XVIII. 1895, p. 10: Alcock, J. A. S. B. Vol. LXIV. pt. 2, 

 1895, p. 201. 



Carapace piriform or elongate-triangular, armed either with tubercles, or with 

 long spines much like those of AnamatMa in their uniform size and definite 

 arrangement : the hepatic and lateral epibranchial spines are always prominent 

 and very conspicuous. The rostrum consists of two spines, which are usually 

 long and slender. The eyes are small, and are retractile against a sharp post- 

 ocular process which commonly is but little cUpped : there is also a supra-ocular 

 save which terminates either in a forwardly directed tooth or in an upturned 

 spine. Basal antenna-joint not very broad, sharply truncated : the mobile 

 portion of the antennae freely exposed on either side of the rostrum. 



Merus of the external maxillipeds as broad as the ischium, slightly expanded 

 at the antero-external angle, and bearing the palp at the antero-internal angle. 



CheUpeds in the adult male (but not in the female and young male) enlarged, 

 with the palms broadened and compressed. 



First pair of ambulatory legs markedly the longest. 



The abdomen in both sexes consists of seven distinct segments. 



The chief difference between Scyramathia and AnamatMa is that in the 

 former the supra-orbital eave is broader and is prolonged forwards as a tooth or 

 spine. In the adult male of Scyramathia also, though not in the female and 

 young male, the hands are compressed and somewhat enlarged, whereas in 

 AnamatMa rissoana (of which there is a male specimen in the Indian Museum) 

 the hands are slender and almost cylindrical. 



