408 



structure of the uropoda and telson would seem to distinguish this form 

 rather prominently. Moreover there are to be found, in the structure of the 

 oral parts, some points of difference apparently of generic value. The genus 

 comprises as yet but a single species, to be described in the sequel. 



4. Pardaliscella Boeckii (Malm). 



(PL 143, fig, 2j. 



Pardalisca Boeckii, Mtilm, Om twa for Vetenskapen nya Araphipod-species fron Boliiisliin. 

 0fver8. af Vet. Akad. Forh. 1870, p. 547, PI. 5, fig. 2. 



Body extremely slender and quite smooth, with the mesosorae very 

 fully developed, being twice the length of the metasome. Cephalon not attaining 

 the length of the first 2 segments of mesosome combined, rostral pi'ojection 

 nearly obsolete, lateral corners somewhat projecting and evenly rounded at 

 the tip. First pair of coxal plates having the anterior corner acutely produced, 

 the 3 succeeding pairs obliquely rounded at the tip, and nearly equal-sized, 

 5tli pair with the anterior lobe fully as deep as the preceding pair. Last 

 pair of epimeral plates of metasome evenly rounded at the lateral corners. 

 Eyes inconspicuous in alcoholic specimens. Superior antennae (in female) 

 scarcely exceeding in length Vs of the body, 1st joint of the peduncle rather 

 large, and exceeding in length the other 2 combined, flagellum but little longer 

 than the peduncle, and composed of about 12 articulations, the 1st of which 

 is much the largest, accessory appendage rather small, 3-articulate. Inferior 

 antennae scarcely longer than the superior, the 2 last joints of the peduncle 

 not much prolonged, and nearly equal-sized, flagellum about the length of 

 those joints combined. Gnathopoda rather strongly built, with the propodos 

 fully as long as the carpus, and oblong oval in shape, or nearly obpyriform, 

 dactylus acuminate, with a single small denticle at about the middle of the 

 concave edge. The 2 anterior pairs of pereiopoda of a similar structure to those 

 in Favdalisca, though much less densely setous; the 3 posterior i)airs rapidly 

 increasing in length, and having the basal joint rather narrow, though con- 

 siderably more expanded in the last pair than in the preceding ones, propodal 

 joint in all very narrow, linear, dactylus extremely slender, being on the 

 antepenultimate pair fully as long as the ju'opodal joint; in the last pair but 

 little shorter. The 2 anterior pairs of uro])oda with the rami lanceolate in 

 form, and each only armed with a single spinule at about the middle of either 

 edge; last pair projecting considerably beyond the others, inner ramus lanceo- 

 late, outer sublinear, both quite naked. Telson not quite twice as long as it 

 is broad at the base, outer half rapidly tapering, cleft very narrow and 

 extending somewhat beyond the middle, terminal lobes acute at the tip. 



