576 . L. A. BORRADAILE. 



II. A vestige of the 6th abdominal limb present [except in Hyjioconclui, where also no epi- 

 podites]. Carapace usually not longer than broad, with well-marked side edge. 



A. An epipodite on the first leg (cheliped) only or on none. Fourth and fifth legs small, 



subdorsal, and usually prehensile. Dromiidae. 



B. Epipodites on all the first three pairs of legs. Fifth leg only small and subdorsal. 



Dynomeiiidae. 



Key to the farniUes of the Homolidea. 



I. Gills 13 or 14 on each side. Epipodites on first one or three pairs of legs. First joint 

 of eyestalk not much longer than second. Homolidae. 



II. Gills 8 on each side. Epipodites not found on any legs. First joint of eyestalk much 

 longer than second. Latreillidae. 



Of the seven species in the present collection three are new, and all the remainder 

 are already recorded from the Indian region. Many of the specimens bear sponges, but, as 

 the species of these have not been determined, no further allusion will be made to them. 



Family Dromiidae. 



Generic names in this family are used here in the sense in which they have lately 

 been defined by the writer {Aim. Mag. Nat. Hist. (7) xi. p. 298). 



Genus Dromia Fabr., 1798. 



1. Dromia riimphi Fabr., 1798 (PI. XXXIII, fig. 1). Alcock, v. p. 137. 



In young specimens, such as the one figured on PI. XXXIII, there is a distinct tooth 

 at the inner orbital angle, and the teeth on the wrist are also much sharper. The species 

 was dredged in Haddumati Atoll in 40 fathoms. 



Genus Dromidiopsis Borradaile, 1900. 



2. Dromidiopsis australiensis (Hasw.), 1882. 



Dromia (Droviidia) australiensis, Alcock, Cat. Ind. Decap. Crust. Ind. Mus. i. i. p. 76 (1901). 



Var. bidens n. Specimens of the variety described by de Man [Zool. Jahrh. Syst. ix. 

 p. 372], with only two of the three teeth behind the orbital angle in the type, were taken 

 in the Maldives. I propose to name this variety hidens. A specimen from Fiji in the 

 Cambridge Museum belongs to the same variety, but there is another Rotuman specimen, 

 and one from Fiji, which have only one of the three side teeth remaining. This I propose 

 to call var. unidens. 



Taken on the reef at Hulule, Male Atoll, and dredged in 2.5 fathoms in South 

 Nilandu Atoll. 



3. Dromidiopsis tridentatus n. sp. (PI. XXXIII, fig. 2). 



Diagnosis : " A Dromidiopsis whose carapace is slightly longer than broad ; the body and 

 limbs smooth, covered with a fine down; the front triangular with the tip just visible from 

 above, deeply grooved and with low swellings of the sides to form a pair of indistinct 

 teeth ; no trace of a tooth at the upper, inner orbital angle, the outer orbital angle strong, 



