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Ophthalmic scales small, widely separated ; eyestalks long, eyes large. 



The upper is much the longer of the two antennular flagella, and is more 

 than half the length of the peduncle. The 2nd joint of the antennal pedun- 

 cle has its antero-external angle produced to form a serrated spine inside which 

 is a similar but larger spine (acicle). 



The mandibles have a smooth subcircular molar facet lying at right 

 angles with a strong sharp incisor process, and have a three-jointed incurved 

 endopodite (palp). 



The 1st and and maxillae have the coxopodite, basipodite, and endopodite 

 well developed : in the 2nd maxillae the coxopodite and basipodite are deeply 

 cleft and the scaphognathite is posteriorly truncated : in the ist maxillae 

 the endopodite (palp) has no flagellum. 



All 3 pairs of maxillipeds have well developed flagellate exopodites, but 

 none of them except the ist pair have epipodites, nor are there any epipodites 

 on any of the thoracic legs. The 2nd and 3rd (external) maxillipeds are 

 pediform and 7-jointed, the external maxillipeds, which are in contact with 

 one another at base, ending in a nearly perfect chela in which the dactylus 

 is a little longer and slenderer than the fixed finger. 



The thoracic legs of the 1st pair are equal, massive, and symmetrical, 

 having the wrist and hand twisted inwards so that the outer surface of the 

 hand becomes superior : the anterior edge of the carpus is produced as a crest 

 that overhangs the hand, and the hands, which have the palm dorsally flatten- 

 ed, can be juxtaposed along the whole of their perfectly straight inner edge 

 and can be flexed vertically almost at right angles with the carpus, so as to 

 form an operculum to the cavity in which the animal hides itself: the fingers 

 are short, with sharp strongly-calcified tips, 



The legs of the 2nd and 3rd pairs are long, slender and compressed, and 

 end in elongate curved dactyli : those of the 4th and 5th pairs are short and 

 subchelate, their dactyli being very short and claw-like and a good deal con- 

 cealed in setae. 



The abdominal appendages of the ist somite are uniramous in both 

 sexes, and in the male have an almost foliaceous tip : those of the 2nd-5th 

 somites are slender and biramous in the female, but are uniramous in the male 

 in which sex also those of the 2nd somite are particularly long and strong 

 and end in a spathulate joint. 



The gills are 14 on either side, disposed as follows : — a pair of arthro- 

 branchs to each segment from the IXth (external maxillipeds) to the Xlllth, 

 and a pleurobranch on each segment from the Xlth to the XlVth. The gill- 

 elements are filaments arranged in double rows on either side of a shaft 

 (quadriserial). 



