1900.] A. Alcock— Oardmloqical Fauna of India. 383 



The chelipeds and legs have the same general proportions as in 

 M. pectinipes, but are shorter. Chelipeds unarmed and unscnlptured. 

 except for some spinnles along the inner angle of the wrist and some 

 denticles along the proximal part of the upper border of the palm : 

 in the distal half of the inner border of the arm is a short upstanding 

 horny " musical crest " : the borders of the arm and the inner border 

 of the fingers are hairy. The dactylus has a small molariform tooth 

 near the base, and the immobile finger has a much larger one. 



The legs are unarmed, except for a small subterminal denticle on 

 the anterior border of the meropodites of the first 3 pairs: the upper 

 surfaces of their joints are more or less hairy. 



In the Indian Museum is a single specimen from Mergui - its 

 carapace is 23 millim. long and 34 millira. broad. 



Family MICTYRIDjE, Dana. 

 Micttris, Latreille. 



Mictyris, Latreille, Gen. Crust, et Ins. p. 40 (1806), and in Cuvier Regne Animal, 

 TIL p. 21 : Desmarest, Consid. Gen. Crust, p. 115, and Diet. Sci. Nat. XX VIII. 

 1823, p. 235 : De Haan, Faun. Japon. Crust, p. 24 : Milne Edwards, Hist. Nat. 

 Crust. II. 36, and in Cuvier Regne An., Crust, p. 67, and Ann. Sci. Nat , ZooL, 

 (3) XVIII. 1852, p. 154: Miers, Challenger Brachyura, p. 278. 



Carapace elongate globose, oval but truncated posteriorly by the 

 short and perfectly straight posterior border, the cervical and cardio- 

 branchial grooves well developed and making the regions very distinct 

 and convex, the posterior border fringed with bristles, as is also the 

 apposed very prominent edge of the first abdominal tergum. 



The afferent branchial orifice is a singular valvular recess, formed 

 dorsally by a semicircular notch in the margin of the carapace, and 

 ventrally by a curious cup-shaped dilatation of the base of the epipodite 

 of the external maxillipeds. 



Front a narrow deflexed lobe as in Ocypoda. Orbits represented 

 by a small post-ocular spine, the eyes, which are borne on shortish 

 stalks, being quite unconcealed. 



Antennules as in Ocypoda, the basal joint being large and exposed, 

 while the flagellum is rudimentary and concealed beneath the front. 

 Antennae small but well formed, standing in the usual position. 



Epistome short lozensre-shaped- Buccal cavity enormous, somewhat 

 oval in outline. External maxillipeds very large and foliaceous, with 

 a hemispherical bulge causing them to face as much laterally as 

 ventrally : their greater part is formed by the ischium, the inner margin 

 of which is hairy, especially at base : the merus is very much smaller 

 J. ii. 50 



