286 A. Alcock— Carcinological Fauna of India. [No. 3, 



The male openings are in the bases of the last pair of legs but the ducts 

 run forward in a sternal groove. 



Most of these families can be further split into subfamilies, as is 

 shown in the following scheme : — 



Family GONOPLACID^E, Dana. 



Gonoplaciens, Milne Edwards (pfc.), Hist. Nat. Crust. II. 56. 



Gonoplacds Canceroides pins Carcinoplacime, Milne Edwards, Ann. Sci. Nat. 

 Zool. (3) XVIII. 1852, pp. 162, 164. 



Gonoplacidx, Dana, U. S. Expl. Exp. Crust, pt. I. pp. 308, 310. 



Carcinoplacinde plus Gonoplacinse plus Hexapodinas, Miers, Challenger Brachyura, 

 pp, 222, 237, 275. 



Carcinoplacini, Ortmann, Zool. Jahrb., Sysfc., VII. 1893-94, p. 683. 



Carcinoplacidde plus Gonoplacidx plus Hexapodinse, Ortmann in Bronn's Thier 

 Reich, torn. cit. pp. 1175, 1176, 1177. 



This family may be divided into the 5 following subfamilies : — 

 Subfamily I. Pseudorhombilin^e (Carcinoplacinse Miers, Garcino- 

 placidse Ortmann). Carapace Xanthoid, the regions seldom well 

 defined : front usually of good breadth and square cut, often little 

 deflexed : eyes and orbits of normal size and form, the eyes well 

 pigmented and the eyestalks normally movable except in certain deep- 

 sea genera : the antennules fold transversely : antennal flagella of fair 

 length. Epistome well defined : buccal cavern square-cut and usually 

 completely closed by the external maxillipeds, Avhieh have a subquadrate 

 merus. The base of the male abdomen covers the whole space between 

 the last pair of legs. Male openings not sternal. 



Subfamily II. Gonoplacinj] (Gonoplacinse Miers, Oonoplacidse 

 Ortmann). The anterior border of the subquadrate carapace is entirely 

 occupied by the square-cut front and orbits, the front being either 

 narrow or of fair breadth, and the orbits being long narrow trenches for 

 the elongate eyestalks. In other respects similar to the Pseudorhom- 

 bilinse. 



Subfamily III. Prionoplacin^: (not represented in India). Differs 

 from Pseudorlwmbilinse only in the form of the male abdomen, which is 

 not broad enough at base to cover all the space between the last pair 

 of legs. 



