'380 A HISTORY OF RECENT CRUSTACEA 



are short, robust, and subpreheusile, of the following pairs 

 ambulatory, very long, with the seventh joint bifid. The 

 anterior pleopods are arranged as in Janira. The uropods 

 are minute, seemingly single-jointed. Two British species 

 have been described, Munna Krb'yeri, Goodsir, and Munna 

 Whiteana, Bate and Westwood, but Sars decides that the 

 former is Inale, the latter female, of one and the same 

 species, so that the name Whiteana must be cancelled. 

 The type is Munna Boeckii, Kroyer. The species are very 

 small, and the differences such as are not always very easy 

 to seize when exhibited on so minute a scale. There are 

 three other Norwegian species, Munna Fabricii, Kroyer, 

 Munna limicola, Sars, and Munna palmata, Lilljeborg, the 

 last distinguished by its enormously developed first pair of 

 feet. Of the 'Munna Fabricii, Sars remarks that Kroyer 

 himself mixed up several species in his description and 

 figures under this name. Beddard describes two species 

 from Kerguelen, Munna pallida and Munna maculata. 

 Chilton describes Munna neozelanica from New Zealand, 

 a species in which the first gnathopods of the adult male 

 have a very remarkable form, with the second joint small, 

 the third 'very thick and strong, hollowed anteriorly to 

 receive the distal end of the limb when bent back ; carpus 

 expanding distally, mallet-shaped ; propodos small and 

 rounded.' 



Paraimmna, Sars, 1866, has exceedingly prominent 

 eyes, the mandibular ' palp ' short and thick, three-jointed, 

 the last three segments of the peraaon narrow and armed 

 with acute lateral processes. The uropods are very short, 

 simple, biarticulate. The genus is intermediate between 

 Munna and Pleurogonium. The type, Paramunna bilobata, 

 has the head divided in front into two truncate lobes. It 

 is a sixteenth of an inch long. 



Pleurogonium, Sars, 1871, is a change of name from 

 Pleuracantha, Sars, 1864, said to be preoccupied. It has 

 some or all of the segments of the perreoii laterally spini- 

 ferous, the anterior four being also acuminate. The pleon 

 forms a single piece constricted at the base with the apex 

 obtusely pointed. There are no eyes. The mandibles 



