190 G. 0. SARS, 



well-marked peduncle inside the coxal plates, at some distance from the in- 

 sertion of the basal joint of the corresponding leg. Close to them, and some- 

 what more inside issue the incubatory lamelhie, forming together the mar- 

 supial pouch. They are likewise rather large and fringed with long setae. 



The 3 pairs of pleopoda exhibit quite a normal appearance. 



The uropoda are very imequal in size (see PL I, fig. 5), the 1st pair 

 being much the largest and, as the succeeding pair (comp. PI. II, tig. 8), 

 having the rami subequal and somewhat falciform in shape, both gradually 

 tapering distally, with a single small apical denticle and another about in 

 the middle of tlie upper edge. The last pair (PI. I, fig. 7) are extremely 

 small, not at all reaching beyond the others, and are also rather different 

 in structure. They consist each of a short and thick basal part, to the end 

 of which ai-e attached 2 very unequal rami. The outer one is a little longer 

 than the basal part and of a narrow linear form, with 3 fascicles of small 

 bristles along one of the edges and a similar one at the tip. The inner ramus 

 is very minute and scale-like, with a single small spine at the tip. 



The telson (fig. 6) is extremely small, and not easy to examine in the 

 uninjured animal, it being completely overlapped by the hooked dorsal pro- 

 jection of the 1st segment of the urosome. When isolated by dissection, it 

 shows itself to be of a broadly triangular form, Avith the length not nearly 

 attaining half the breadth, and the tip cleft by a short and narrow incision. 

 On the dorsal side of each of the narrowly rounded terminal lobes occurs a 

 very small spinule; otherwise the telson is quite unarmed. 



The adult male (see PI. II) attains a still larger size than the female, 

 the length of the body, when fully extended, amounting to no less than 

 25 mm. In general appeauance it does not differ much from the female, 

 except by the body being considerably less tumid. In a dorsal view of the 

 animal (PL II, fig. 1) the sex may therefore at once be determined. Of the 

 several appendages it is chiefly the gnathopoda, which distinguish them- 

 selves by a much stronger build than in the female (see figs. 2 and 3). 

 Especially appears the propodos in botli paii's much larger and considerably 

 expanded, forming below a broadly rounded lobe defining the palm interiorly 

 and armed with a number of strong anteriorly curving spines. The palm is 

 deeply concave, and the strongly curved dactylus impinges, when closed, 

 with the tip somewhat inside the inferior expansion of the propodos. The 

 pereiopoda are on the whole of the same structure as in the female, though 

 being perhaps a little more elongated and having the basal joint of last 

 pair somewhat less expanded. Finally, the outer ramus of the last pair of 

 uropoda (fig. 9) appears a little longer and is provided on the inner edge 

 with several slender bristles not found in the female. Of course no incuba- 



$H3.-MaT. cTp. ItiO. j2 



