CRUSTACEA. 553 



lather long whitish hairs, the chclipedes rather Blender; finger-tips 

 white. 



By Kossmann (t. c. zweite Halfte, p. 67, L880) D. unidentata and 

 D. rotiimfii are regarded as synonymous. The sjieeimens collected 

 by Kossmann in the Red Sea are distinguished from I), spongiosa 

 var. stimpsonii by the prominent lateral teeth of the rostrum and 

 the existence of a distinct lateral marginal tooth behind the cervical 

 suture. 



2. Dromia vulgaris, M.-Edw. 



Two very small specimens from Providence Island, 19 fms. (No. 

 217), are perhaps referable to this species. They do not present 

 the elongated tubercles on the sternal surface characteristic, as llil- 

 gendorf has shown, of I), rumphii*, to which species a specimen 

 from the Mauritius (J/. Robillard), which I formerly designated as 

 D. vulgaris, is to be referred, as the sternal tubercles are strongly 

 developed. A female, presumably from the Indian Ocean {General 

 Hardwiclce), apparently belongs to D. vulgaris, since in this speci- 

 men the sternal tubercles are absent ; yet it is to be noted that it 

 presents but slight indications of the secondary tubercle or spine 

 behind the base of the second antero-lateral marginal spine -which 

 is generally characteristic of 1). vulgaris. In the specimen from 

 Mauritius also the secondary lateral spine is absent, but in an 

 adult male Malayasian specimen from Dr. Bleeker's collection it is 

 strongly developed. 



HOMALODROMIA, gen. nov. 



Carapace flattened above, somewhat hexagonal in shape, almost as 

 broad as long. Front broad, consisting of two prominent lobes which 

 project over and beyond the bases of the antennae, and are each exca- 

 vated at the distal extremity. Epistoma (or interantennulary septum) 

 triangulate and united with the front. Palate with faintly defined 

 longitudinal ridges (colliculi). The sternal sulci in the female ter- 

 minate in two strong tubercles, which are nearly in contact at their 

 bases, and arc situated between the bases of the chelipedes, which 

 have the apices of the fingers denticulated, corneous, and excavated. 

 Ambulatory legs of the second and third pairs without spines or 

 tubercles, with the merus-joint not dilated, the dactyli slightly curved 

 and armed on the inferior margin with two or three accessory spi- 

 nules. Fourth legs more robust and much shorter than the fifth 

 pair and scarcely prehensile, the penultimate joint being armed at its 

 distal extremity with a very small spinule. Fifth legs slender and 

 elongated (yet less elongated than in Pseudodromia), shorter than 

 the second legs, prehensile, with the penultimate joint shorter 

 than the preceding, and its terminal spine slender, arcuate, and 

 about as long as the slender arcuate dactylus. 



This genus cannot be confounded with any known to me. It 



* Monatsber. Akad. Wiss. Berlin, p. 813 (1878). 





