208 



The branchiae are commonly 14 on either side, and are commonly phyllo- 

 branchiae. 



DeHaan divided the Anomala into 5 families, Boas divides them into 3 

 sections, two of which are represented in the depths of the sea, while the third 

 includes only burrowing littoral forms. 



Key to the family-groups of Anomala of the Indian Benthos. 



I. The rostrum is either ill-developed and does not conceal the ophthalmic 

 somite, or if the rostrum is well developed and completely conceals the 

 ophthalmic somite then the telson is small and the caudal swimmerets 

 are not represented. Antennal peduncle five-jointed. Incisor edge of 

 mandible entire ... ... ... ... ... PAGURIDKA. 



II. Rostrum well developed: telson and caudal swimmerets large foliace- 

 ous and symmetrical. Antennal peduncle either four-jointed, or if 

 five-jointed then the postero-lateral angles of the carapace are held 

 down by the outer angles of the first abdominal somite below and the 

 prominent antero-external angle of the 2nd abdominal somite above 

 and the incisor edge of the mandible is serrated ... ... GALATHEIDEA. 



PAGURIDEA, Henderson. 



Paguroidx, Boas, Via. Selsk. Skr. 6 Raekke, Nat. o Math. Afd. I. 2, 1880, p. 189. 



Paguridea, Henderson, Challenger Anomura, p. 40: Ortmann, in Bronn's Thier Reich, Malaoostraca, p. 1143. 



Carapace either elongate and subcylindrical or broad depressed and crab- 

 like, the front not fused with the epistome. 



The abdomen is usually asymmetrical soft and coiled in a spiral, or bent ; or 

 is sometimes abruptly flexed against the thoracic sternum as in crabs ; very 

 rarely is it quite symmetrical, well calcined, and straightly extended. The 

 caudal swimmerets may either be present or altogether wanting : when present, 

 they are usually asymmetrical. 



Antennal peduncle five-jointed, the 2nd joint almost always carries a spini- 

 form scale ^antennal acicle). 



The flagella of the maxillipeds, when present, are flexed inwards, and the 

 external maxillipeds are pediform. 



The thoracic legs never carry epipodites. The 1st pair are massive and 

 chelate : the 5th pair are always, and the 4th pair often very much less developed 

 than those in front of them. 



It is very seldom that all the abdominal somites carry well developed paired 

 appendages : as a general rule the appendages of the 2nd 5th somites of the 

 female and of the 3rd-5th somites of the male, when present, exist on one side 

 only. 



