Cardiological Fauna of India. 291 



flattisli and not very deep, the regions usually Avell defined : front 

 variable, but never very broad : auteunules with a well developed flagel- 

 lum that folds tiausversely, interantenuular septum very narrow ; 

 eyestalks usually elongate: the external niaxillipeds do not alwiiys meet 

 across the buccal cavern, though the gap between them is never very 

 wide, their cxognath is not, or not entirely, concealed and has a flagel- 

 lum : chelipeds usually subequal. No special recess between the bases 

 of any of the legs. 



Family MICTYRID^, Dana. 



Pinnotheriens, Milue Edwards (pt.), Hist. Nat. Ciust. IT. 39. 



Ilyctiroidea, Milne Edwax-ds, Aim. Sci. Nat., Zool., (3) XVIII. 1852, p. 15-i. 



Mictyridw, Dana, U. S. Expl. Exp., Crust, pt. I, pp. 309, 389. 



Pinnotlieridie-Myctirinie, Miers (pt.), Challenger Brachyura, p. 275 ; Ortinaun 

 (pt.) in Bronu's Thier Keicb, torn, cit., p. 1179. 



Ocypodidse-Myctiri7ix, Ortmann (pt.), Zool. Jalirb., Syst. VII. 1893-94, pp. 742, 

 747. 



There can be little question that Milne Edwards was right in 

 reckoning Miclyris as a " satellite " of the Ocypodidce, or that Dana's 

 plan of separating them as a distinct family is fully justified. The 

 affinities Avhich several authors find between Miclyris and the Pinnoteridas 

 are by no means easy to recognize. 



Family HYMENOSOMID^, Ortmann. 



Pinnotheriens, Milne Edwards (pt.), Hist. Nafc. Crast. 11. 39. 

 Eymenosomina;, Milne Edwards, Ann. Sci. Nat., Zool. (3) XX. 1853, p. 221. 

 Pinrwtheridas-Hymenicinw, Dana, U. S. Expl. Exp., Crust, pt. I. pp. 379, 384. 

 Pinnotheridse-Hyinenosomime, Miers, Challenger Brachyura, p. 275. 

 Majoidea-Hymenosomidie, Ortmann, in Bronn's Thier Reich, torn, cit., p. 1168. 



Three types seem to be distinguishable in this family : in one (e.g. 

 Hymenosoma) there is no epistome and the external niaxillipeds almost 

 encroach on the bases of the antennules, which appendages are not 

 concealed by the front; in the second {e.g. Halicarcinus) there is an 

 epistome of considerable length, but the antennules are still uncon- 

 cealed by the front; in the third {e.g. Hymenicus) there is along 

 epistome and the antennules are quite concealed by the front. 



Family PTENOPLAClDJi. k^SS 



This family has no very close connexions with any of the others 

 although it is an undoubted Catomctopc. 



633 



