1890.] A. Alcock — Carcinological Fauna of India. 9 



The genera that constitute this Alliance are the following : — 



1. *Charybdis, De Haan (or Goniosoma, A. Milne Edwards) with 

 subgenera *Gonioneptunus Ortraann and *Goniohellenus {nov.). 



2. Cro7iius, Stimpson, Ann. Lye. Nat. Hist. New York, VII. 1860, 

 p. 225 (Gharyhdella, M. J. Rathbun, Proc. Biol. Soc. Washington, 

 XI. 1897, p. 166). 



3. Ltipa, De Haan, Faun. Japon. Crust, p. 11 : A. Milne Edwards, 

 Archiv. du Mus. X. 1861, p. 351 (Lupella, M. J. Rathbun, torn. cit. 

 p. 155). 



4. *Neptunus, De Haan (Portunus, M. J. Rathbun, torn. cit. p. 155, 

 nee auctorum) with sub-genera *Achelous, *AniphitrIte, ^GalUnectes, 

 *Hellenus (including *Xiphonectes) and *Lupocycloporus (nov.). 



5. *Scylla, De Haan. 



6. *Thalamita, Latreille : with sub-genus Thalamitoides A. Milne 

 Edwards, Nouv. Archiv. du Mus. Y. 1869, p. 146. 



7. ^Thalamonyx, A. Milne Edwards. 



[8. Eedrophthalmus, Nauck, Zeits. Wiss. Zool. XXXIV. 1880, 

 p. 67]. 



Alliance 2. Podophthalmoida. As Lupoida, but the eyes are 

 borne on basal stalks of enormous length and the orbits are continued 

 along the whole of the antero-lateral borders of the carapace. 



The genera that constitute this Alliance are : — 



1. *Podophthalmus, Lamarck. 



2. Euphylax, Stimpson, Ann. Lye. Nat. Hist. New York, VII. 

 1862, p. 225. 



Alliance 3. Lupocycloida. The basal antenna-joint, though not 

 long, is rather slender and does not lie transversely or have its antero- 

 external angle produced to any extent. 



The chelipeds are considerably, sometimes very much, longer than 

 any of the legs, of which the first three pairs are slender. 



In the fourth pair of legs the last two joints are much broadened, 

 but the merus and carpus may he slender. 



The carapace is of no very remarkable breadth, the antero-lateral 

 borders are about as long as the postero-lateral, and at least one trans- 

 verse ridge is present on either side. 



Two genera enter into this Alliance, namely, 



1. *Carupa, Dana (in which the merus and carpus of the last 

 pair of legs are not broadened) . 



2. *Lupocyclus, Adams and White (in which the merus and 

 carpus of the last pair of legs may either be broadened or not). 



In the preceding scheme of classification the Indian genera are 

 printed in Roman type and the genera known to me by autopsy are 

 marked with an asterisk. 

 J. II. 2 



