REPORT ON THE CRUSTACEA MACRURA. 899 



slender styliform rostrum ; the frontal margin does not appear to lie armed with a 

 supraorbital or other tooth, and the fronto-lateral angle does not project beyond a right 

 angle. 



The pleon has the anterior five somites subequal in length, the third is slightly the 

 longest, and overlaps the fourth on the dorsal surface, hut it is not projected to a tooth ; 

 the sixth somite is as long as the preceding two, and the telson is about half the length 

 of the sixth somite. 



The ophthalmopoda are longer than the carapace, and at the base between them is 

 a large orbicular lobe that is furnished at the posterior portion with a distinct ocellus ; 

 they are Particulate, the first joint is a long and slender cylindrical stalk, supporting 

 at its extremity an equally long and pear-shaped segment, at the extremity of which 

 is the rounded facetted ophthalmus. 



The first pair of antennae is more than half the length of the animal, and terminates 

 in two unequal flagella ; the outer is the more robust, and is furnished with numerous 

 sensory cdia, the inner being slender and longer ; the peduncle is longer than the 

 ophthalmopod, and slightly curves towards the distal extremity, the first joint is very 

 long, the second is short, and the third still shorter, all being cylindrical. 



The second pair of antennae supports a scaphocerite that is nearly as long as the 

 ophthalmopod ; it is distally rounded, and the inner margin is fringed with hairs. 



The mandibles do not carry a synaphipod, but are furnished with a serrate psalistoma 

 and a strong molar prominence ; this organ lies closely impacted between the anterior and 

 posterior labia. 



The supplementary oral appendages are small, and have not been closely examined 

 as the specimen is unique. 



The first pair of gnathopoda is short, pediform, and tolerably robust, but I could not 

 be certain that it carries a basecphysis. 



The second pair is long, slender, and six-jointed, and terminates in a short sharp- 

 pointed dactylos, and the basis carries a long ecphysis. 



The pereiopoda are formed on the same type as the second pair of gnathopoda. They 

 are all six-jointed and cylindrical ; the basis is comparatively long, and the ischium and 

 meros appea*- to be united ; the carpos is shorter, but proportionately longer than usual, 

 the propodos is short, and the dactylos is short, pointed, and terminates in a small 

 bristle. They are all furnished with a basecphysis, w T hich is slender and subequal in 

 length with the respective pereiopod, excepting the penultimate pair, in which it is not 

 more than one-third its length. The fifth or ultimate pair of pereiopoda in this species, 

 as in all the specimens of the other species, is broken off at the basisal joint, which from 

 its large size (although in this species it is not so large as in some others) indicates that 

 this appendage is of some peculiar significance in relation to the animal. 



The pleopoda are not yet present, but traces of their development appear at the 



