126 A. Alcock — Carcinological Fauna of India. [No. 3, 



the 6th pair of abdominal appendages — is intercalated between the 

 6th and 7th somites. 



The gill-plumes vary in number from 20 to 14 on either side, and 

 are either trichobranchias or phyllobranchiae. 



Many of the species are pi-otected by a commensal Sponge or 

 Ascidian, or by an empty valve of a Lamellibianch shell, carried over 

 the back. 



Tribe II. HoMOLTDRA. 



BomcUenss (part), Milne Edwards, Hist. Nat. Crnst. TT. 180. 



Homo/ida', Henderson, Challenger Anomura, p. 18: Ortrrann in Bronn's Thier 

 Reich, V. ii., Arthropoda, p. 1155. 



Carapace longer than broad : linea anomurica, usually present.* 

 The eyes are not retractile into orbits, nor the anteniiules into pits. 

 Basal antennulary joint subglobular. 



The eye-stalks each consist of two movable joints, a slender con- 

 spicuous basal joint which is sometimes of great length, and a stout 

 terminal joint that carries the eye. The antennal flagella are, except 

 in the Latreillidfe, much longer than the carapace. 



The interantennulary septum is a distinct vertical process, and is 

 not formed merely by the close apposition of the apex of the epistome 

 to the front. 



The front forms a slender triangular prominent rostrum which 

 may be bifid at tip, and often has a spine on either side of its base. 



The division between the epistome and palate is distinct, but the 

 vault of tlie palate is shallow. 



External niaxillipeds pediform or sub-operculiforra. 



The chelipeds aiid legs are long and slender : the fingers are not 

 channelled en cuillere. Only the last pair of legs is dorsal and reduced 

 in size. 



Sternum of the female broad, without any special longitudinal 

 grooves. 



The abdomen of the male, and usually but not always of the female 

 also, consists of seven separate segments. There are no lateral platelets 

 intercalated between the 6th and 7th segments. 



The gills are phyllobranchiae, and the gill-plumes vary in number 

 irom 14 to 8 on either side. 



* The linea anomurica is a curious suture-line running fore and aft on either side 

 from the posterior border of the campace to the inner side of the antennal spine. 

 For its honiologue among the nearer relatives of the Homolidea we have to go to 

 certain species of Pcneus. 



