exotic Sessile-eyed Crustaceans. 185 



antej)enultimate — tlie former being more slender than the latter, 



but in length subequal botli to it and to the second joint of 

 the u{»[)er antenna?. The tlagelhim of the upper antennse ia 

 longer and stouter tlian that of tlie lower. 



In the first and second gnathopods the wrists and hands 

 are hairy ; the wrist in each case is about eqnal in length to 

 the hand. The hand in the first gnathopods is subovate in 

 shape, with no distinct palm, and the linger projecting rather 

 prominently. In the second gnatiiopods the hand is rather 

 larger, witii a fairly defined palm, upon which the finger folds 

 down without overlapping it. In the five following pairs of 

 legs (the pereiopoda) the fingers are all directed backwards, 

 a character which Mr. Spence Bate notes as generally pre- 

 vailing in the genus Dexamine. It is these five pairs of 

 ))ereiopoda which are the most peculiar and distinctive parts 

 of the animal. They are all alike, with the exception of the 

 coxal joints ; and as far as could be made out, they are all 

 equal. The thighs are well developed both in breadth and 

 length. Tlie metacarpal joints are also long, about equalling 

 the wrist and hand conjointly. Long spines are attached to 

 the postero-distal extremity of the wrist. The hands are 

 j)rehensile, a much-curved finger being opposed to the outer 

 point of an excavated palm. In the actual state of the spe- 

 cimens it was not, however, possible to decide whether the 

 palm terminated in two points with a central spine, or in one 

 point with a spine on either side. There seemed to be an 

 additional spine within the palm close to the base of the 

 finger. The telson is long, lanceolate, and deeply cleft. The 

 coxal joints are figured as they appeared ; but those of the 

 first three ])airs of pereiopoda were not well preserved, and 

 in a normal state are probably less irregular in shape than 

 those which I have drawn. 



The specimens have a very noticeable metallic lustre. 



Unless a new genus should be thought wanting, on account 

 of the prehensile feet of the pereiopoda, Dexamine antarctica 

 will be an appropriate name for this minute novelty. 



II. The next species to be desci-ibed, also minute and also 

 new, comes from Algoa Bay, South Africa. It travelled to 

 England with the same collection of sponges and Gorgonias 

 which supplied the Arcturidae described in the 'Annals' for 

 August 1873. There can be little doubt that it ought to be 

 referred to the genus Seha^ founded by Costa for a Neapolitan 

 species, which Mr. Spence Bate has described and figured in 

 his British-Museum Catalogue, stating that " the descriptions 

 of both the genus and species, as well as the figure, are taken 



