PHYLLOBRANCIIIATE CRUSTACEA-^^IACEUEA. 41.3 



Genus 2. IIippolytk, Lcacli, 1815. 



The generic character, as limited by Speuce Bate, is i^ivcn at length in tlie 'Challenger' 

 Macrura, p. 587. 



1. HippoLYTE BiFiDiPvOSTias, Miers. (Plate 28. ligs. 1,'] IG.) 



1870. Virhhis bijidirostnn, Miers, Ann. & Mag. Nat. Hist. ser. 4, xvii. p. 2:.'l ; Cut. N.Z. Crust, p. 81, 

 pi. 11. tig. 1. 



Carapace with a jorominent acute spine over the eje-socket, a second subocular spiiiuh; 

 on the front margin just between the bases of the two ])airs of antennjK, and a tliinl just 

 close to the margin behind the base of the second antenna; infero-anterior angle 

 sul)acute. llostrum subequal with or slightly longer than the carapace ; upper margin 

 with two teetli placed just above the eyes, and a minute notch at the apex ; lower 

 margin with five to seven teeth. 



The 2)leon is sharply bent (in all spirit-specimens) at the extremity of the third 

 segment, the dorsal margin of which is slightly produced and hood-like. Tlie fourth and 

 fifth segments have their inferior margins produced considerably back into rounded and 

 subacute lobes respectively. 



The telson is long, narrow, and slender, ending at its sliglitly rounded apex in a row 

 of small spinules. 



The ophthalmopods (fig. V.\) are rather elongated, and scarcely dilated towards the 

 extremity ; the eyes only occupy abt)ut a third of tlieir length. 



The first antennte (fig. It) have the first joint of the peduncle flattened, and broadened 

 on the inside into a narrow wing which ends in a spine ; the Imsal scale is acute and 

 nearly as long as the first joint of the peduncle. The outer flagellum is short and 

 imperfectly segmented, as seems to be usual in species of this genus. 



Tiie second antenna- have the peduncle very shoi-t, and the scaphocerite oval and 

 reaching beyond the extremity of the rostrum ; the flagellum is very slender and often 

 as Ion 2: as the entire animal. 



The third maxillipeds (fig. 15) are long and stout ; the tliird joint is subequal in length 

 to the iburth and fifth together ; the latter terminates in a number of minute spines. 



The first pereiopoda (fig. 1(5) are very short and stout ; the carpos is produced on its 

 upper margin into a blunt spine; the propodos is subquadrate in form. 



The second pereiopoda are nearly twice as long as the first pnir ; tlie iscliium, meros, 

 and carpos are about subequal in lengtli, the latter being three-jointed and having tlic 

 middle joint the shortest ; the propodos is short and straight, witli a stout straight 

 dactylos. 



The succeeding pairs of pereiopoda are long and well developed ; th(> nropoda have a 

 few long spinules on their lower margins, while the long straight dactyla are pectinately 

 spined. 



The pleopoda are well developed, and the inner branches of tlie females bear a well- 

 developed process (st\lamblys of Spence Bate). 



(U» 



