234 Carcinoloyical Fauna of India. 



Andamans, and young males from Palk Straits, Mergui (and Hong- 

 kong). 



The young male from Mergai has been named Pseudophilyra hoedtii 

 by Dr. de Man. 



64. Leucosia truncata, n. sp. Plate VI. fig. 6. 



Differs from L. pubescens, ovigeixms females compared, only in the 

 following characters : — 



1. The front is broad and so extremely short that its free edge 

 does not project beyond, indeed barely projects as far as, the epistome. 



2. The thoracic sinus is extremely shallow, but yet is a distinct 

 sinus, with a row of minute granules above the base of the chelipeds. 



3. The dactyli are palmulate. 



4. A distinct line of sharp cut beads bounds the inner edge of the 

 •wrist and of the hand. 



Two adult (ovigerous) females from the Orissa coast. The coloura- 

 tion is exactly similar to that of L. pubescens, but darker. 



The first specimen that I saw I regained, after careful exami- 

 nation, as either a malformation of L. pubescens, or a specimen of L. 

 pubescens that had had its front broken aud imperfectly repaired. 

 But a second ovigerous female of exactly similar form, from another 

 dredging station, now leads to the conclusion that, instead of being 

 malformations, these two specimens must represent either a new species 

 of the L. craniolaris and rhomboidalis type, or possibly may belong to 

 the L. porcellana of Fabricius, which de Man states definitely is a true 

 Leucosia. 



At any rate the species here under consideration is a genuine Leu- 

 cosia, and not a I'seudophilyra or Philyra. 



65. Leucosia rhomboidalis, De Haan. 



Leucosia rhomboidalis, DeHaan, Farm. Japon. Crnst. p. 134, pi. xxxiii. fig. 5 : 

 Bell, Trans. Liun. Soc. Vol. XXI. 1855, p. 284, and Cat. Leucos. Brit. Mus. p. 

 6: F. Muller, Verh. Ges. Basel, VIII. p. 472 : A. Ortmann, Zool. Jahrbiich. Syst. 

 etc., VI. 189:2, p. 586. 



? Leucosia craniolaris, Desmarest, Consid. Gen. Crust., p. 167, pi. xxvii. fig. 2. 



Leucosia maculata, Stirnpson, Proc. Acad. Nat. Sci. Philad. 1858, p. 159. 



Differs from L. craniolaris Herbs t, only in the following particulars, 

 adults of both sexes being compared : — 



1. Its size is very much smaller : the carapace of tlie adult, in our 

 series of 23 specimens, is never more than 16 millim., and is usually 

 about 14 millim. long. 



2. The front, which is as long as broad, has its sides subparallel 

 239 



