24 



inner long and strong, the other thinner and distinctly or very considerably shorter; on the 

 inner margin first and second subjoints have each on the end a very long and strong spine, 

 fourth subjoint a considerably smaller spine ; on the inner margin of all subjoints together is 

 found in the leg exhibited (fig. 2r, a.) in all 37 spines — the terminal not included — extremely 

 different in size and several among them very small ; on the lower side near the outer margin 

 is found a long, thin spine near the end of first and second subjoints, and sometimes a cor- 

 responding but quite small spine is observed on fourth subjoint. The thoracic legs are slender; 

 first pair (figs. 2d and 2e), as already stated, small, with a conspicuous, oblong, curved, acute 

 tooth or robust spiniform process on the dorsal side of third joint, and the terminal joint not 

 subdivided. Second pair have on the dorsal side of third joint a curved acute process which 

 Is longer than in first pair; third pair, when stretched forwards, reach about the end of the 

 antennular peduncle. Fourth pair (fig. 2/) is a Httle shorter than the first, with the two distal 

 joints somewhat narrow; fifth pair is unusually short, and their two distal joints narrow with 

 rather few natatory cilise. The exopod of the uropods tapers from somewhat from the base to 

 the narrowly rounded end ; its outer margin is ciliated in the whole length and feebly concave 

 from somewhat from the base to the end. 



The branchiae above the thoracic legs are long; above third pair a branchia and a 

 lamella ; above fourth pair two branchiae, the first slightly shorter than that above third pair, 

 the second somewhat shorter and considerably narrower than the first, but of the same regular, 

 oblong shape and very well developed. 



The petasma (figs. 20^ — 2z and fig. 2k) differs extremely from that in any species of 

 group I. Pars externa is small, its lamina {/am.) is very oblong, more than half as long again 

 as broad and broadest in front, with the posterior two-thirds of the outer margin concave and 

 the anterior third convex ; processus uncifer {/>u.) is reduced, conspicuously less than half as long 

 as lamina externa, and its terminal part rounded without any incision. Pars media is extremely 

 broad; processus basalis is a large, triangular plate a little broader than long with the end 

 narrowly rounded. Processus ventralis {J>v.) is quite minute, oblong-triangular, with the distal 

 part very narrow. Lobus armatus {/a.) is short, extremely broad and divided by a short but 

 very broad terminal incision into two diverging branches; several small hooks are observed at 

 the inner margin of the inner branch, and numerous small hooks on the anterior side and at 

 the end of the outer branch. Lobus connectens {/c.) is moderately short and very thick with 

 the end broadly rounded ; it has many conspicuous hooks on the posterior side and along the 

 inner margin. Lobus terminalis (/A) is moderately short, very slender, subcylindrical, with a 

 single very large hook on the obtuse end. Lobus inermis (//.) is larger than any of the other 

 lobes, directed forwards and much inwards, very thick to the broad, very obtuse end, and without 

 hooks. At the base of lobus inermis is found a very slender lobe terminating in a very large 

 hook; as no corresponding ramification is found in the preceding forms it is named lobus acces- 

 sorius {lac). Pars astringens (a.) is small, but the coupling hooks along its inner margin are 

 well developed. 



Length of a large male 19 mm., of a male from the Chinese Sea 20 mm., of a 

 female 16 mm. 



