1899.] A. Alcock — Carcinological Fauna of India. 67 



In an average specimen the length of the carapace is 26 millim., 

 and the extreme breadth 48 millira. 



Gharybdis (Ooniohellenus) hopUtes, var. vadorum. 



Differs from the typical deep-sea form in the following particu- 

 lars : — 



CI) the carapace is depressed, therefore the granular convexities 

 of the areola9 stand out in higher relief : 



(2) the last spine of the antero-lateral borders is rather longer : 



(3) the spine at the inner angle of the wrist is much longer: 



(4) Egg-laden females are hardly half the size. 



In the Indian Museum are 9 specimens from the Orissa coast, 7| to 

 20 fms., 6 from the Persian Gulf, and 3 from the Arakan coast. 



Charyhdis {Goniohellenus) hoplites Ya,r. pusilla. 



This is a dwarf variety, egg-laden females having a carapace only 

 about 9 millim. long and about 16 millim. in extreme breadth. 



The carapace is of a thin texture, the chelipeds and legs are slen- 

 derer, and the dorsal bulge of the branchial regions is stronger and 

 sharper. 



In the Indian Museum are 300 specimens from off the Konkan 

 coast 56 to 58 fathoms. 



Gonioneptumis, Ortmann. 

 Gonioneptunus, Ortmann, Zool. Jahrb. Syst. etc., VII. 1893-94, p. 79. 



This " genus," as Ortmann remarks, is a link between Charyhdis 

 ( = Goniosoma) and Neptiinus, It has much the same bearing to Gonio- 

 soma that the " genus " Cronius has to Neptunus, and is one of those 

 forms that would justify any general zoologist in uniting all the Lupine 

 "genera" of systematists into one natural genus. 



It differs from Goniosoma only in the fact that the broad lobular 

 process of the external angle of the basal antenna-joint is not in con- 

 tact with the front, so that the antennal flagellum is not excluded- from 

 the orbital hiatus. 



42. Charyhdis (Gonioneptunus) truncata (De Haan). 



Portunus truncatus, Fabrlcius, Ent. Syst. Suppl. p. 365, and Latreille, Hist. Nat. 

 Crust. VI. p. 16, (fide A. M. Edw.). 



Thalamita truncatUy Milne Edwards, Hist. Nat. Crust. I. 463 (fide A. M. Edw.). 



Portunus (Thalamita) truncatus, De Haan, Fann. Japon. Crust, p. 43, pi. xii. 

 fig. 3, ? only. 



Portunus (Gharyhdis) truncatus, De Haan, Faun. Japon. Crust, p. 65, pi. xviii. 

 fig. 2. 



