4 Mr. E. J. Miers on the 



The species are, I believe, restricted to the shallower waters 

 of the Indo-Pacific or Oriental region. 



The species enumerated in the present revision may be 

 distinguished by the following diagnostic characters : — 



A. Rostrum armed with eight spines (three lateral spines on each side 

 of the two distal and terminal spines). 



Carapace (in the adult) with nume- 

 rous dorsal spines. Chelipedes with 

 the palms elongated, not dilated .... 1. Micippa cristata (Linn.). 



B. Rostrum armed with four spines (one lateral spine on each side of the 

 two distal and terminal spines). Carapace without dorsal spines. 



Carapace convex. Basal antennal 

 joint with distal spines, the next joint 

 elongated and but little dilated dis- 

 tally. Chelipedes (in the adult male) 

 with the palms but little enlarged .... 2. Micippa mascarenica , Kossmann. 



Carapace somewhat depressed. Ba- 

 sal antennal joint without distal 

 spines, the next (mobile) joint com- 

 pressed and distally dilated. Cheli- 

 pedes rather short, with the palms 

 enlarged ; fingers meeting only at tips, 

 with a wide intermarginal hiatus .... 3. Micippa philyra (Herbst). 



C. Rostrum terminating in two lobes, which have the antero-internal 



angles acute or toothed and the antero-external angles rounded or 

 armed with a small tubercle or tooth. 



Rostrum thin, deflexed. Carapace 

 usually armed with dorsal spines. 

 Chelipedes (in the adult males) with 

 the palms short, enlarged ; fingers with 

 a wide intermarginal hiatus at base . . 4. Micippa spinosa, Stimpson. 



Rostrum thickened, indexed. Cara- 

 pace without dorsal spines. Chelipedes 

 with the palms not enlarged, fingers 

 with scarcely any intermarginal hiatus 5. Micippa curtispina, Haswell. 



D. Rostrum deeply notched or bifid, terminating in two narrow 

 acute lobes or spines. 



Carapace with or without dorsal 

 spines. Chelipedes with the palms 

 slender, not dilated ; fingers with 

 scarcely any intermarginal hiatus .... 6. Micippa thalia (Herbst). 



Micippa cristata. 



Cancer spinosns, Rumph, d'Amboinische Rariteitliamer, p. 15, pi viii 



%. 1 (1741). 

 Cancer cristatus, Linn. Mus. Lud. Ulrica?, p. 443 (1764): Syst Nat 



p. 1046 (1766). 



