166 A. Alcock — Carcmohgical Fauna of India. [No. 2, 



of over 60° : hands stout, generally longer than broad, and compressed, 

 hardly ever broader at the base than at the distal end — when short 

 broad and swollen (as often occurs in the Oi-eophoroid alliance) then the 

 immobile finger is markedly more massive than the dactyl us. 



2. Subfamily Iliinse. Merus of external maxillipeds half or less 

 than half the length of the ischium measured along the inner border : 

 fingers slender, almost of the same diameter from base to near tip, 

 either very much longer than the hand, or if shorter than the hand 

 then of filiform slenderness ; either opening and closing in a vertical 

 plane, or if in a nearly horizontal plane then the tip of the dactylus is 

 movable through an arc of about 120° : hands either short swollen and 

 subglobular, or tapering-cylindrical with a swollen base, always much 

 broader at the base than at the point of origin of the fingers. 



The following is a list of the genera of Leucosoid Crabs, so far as 

 known to me, arranged in accordance with the classification here 

 proposed. Indian genera are printed in Roman type, and all genera 

 known to me by autopsy are marked with an asterisk : — 



Family Leucosiidae. 



Sub-family I. Leucosiinse. 

 Alliance I. Oreophoroida. 



* Actseomorpha. 



? Carcinaspis, Stimpson, Proc. Acad. Nat. Sci. Philad. 1858, p. 161. 

 Crypfocnemus, Stimpson, Proc. Acad. Nat. Sci. Philad. 1858, p. 161. 



* Heteronucia, n. gen. 



* Merocryptus, A. Milne-Edwards, Journ. Mus. Godeff. I. iv. p. 84 

 (260). 1873. [Transition towards Nursia']. 



* Oreophorus. 



Spelxophorus, A. Milne-Edwards, Ann. Soc. Ent. Franc. (4) V. 

 1865, p. 148. 



* Tlos. 



TJhlias, Stimpson, Ann. Lye. Nat. Hist., New York, X. 1874, p. 117. 



Alliance II. Nursioida. 



* Ebalia. 



Lithadia, Bell, Trans. Linn. Soc. XXI. 1855, p. 805. 



* Nursia. 



Phlyxia, Bell, Trans. Linn. Soc. XXI. 1855, p. 303. 



\_JkUidilia, Kinahan, Journ. Roy. Dub. Soc. I. 1858, p. 128 : re- 

 garded by Miers, ' Challenger ' Brachyara, as synonomous with {Phlyxia 

 and) Ebalia.'] 



