277 



towards the distal end. Dactylus almost half as long as the propodus, resembling that of the 

 4''^ peraeopods. 



Exopodite of 2'"' pleopod (Fig. 65/^) 1,8 mm. long, 4,7-times as long as broad proximally; 

 the endopodite, i mm. long and 5-times as long as broad, is implanted at a somewhat lower level 

 and reaches therefore not yet to the middle of the outer branch. Xo trace of stylamblys. 

 Both the exo- and the endopodite are fringed with long feathered setae. 



The other specimen differs by the following : 



1) By its smaller size, the entire length being 14 mm., the carapace 3,8 mm. long, 

 the abdomen 10,2 mm.; the 6''^ somite is 1,8 mm. long, 0,5 mm. thick in the middle, the 

 telson 2,65 mm. long. These numbers show that, in proportion to the length of the carapace, 

 the abdomen, the 6''i somite and the telson are a little shorter, the 6^^ somite, moreover, 

 a little thicker. 



2) The rostrum, 0,48 mm. long, measures one-seventh the length of the rest of the 

 carapace, it is 4-times as long as broad in the middle and the anterior margin is slightly concave. 



3) From the gastric spine a carina runs backward to a little behind the 

 middle of the carapace; though this carina is obtuse and not prominent at all, it is, 

 however, quite distinct. 



4) The I*' or uppermost lateral spine is wanting. 



5) The eyestalks show the same ochraceous colour as the body, though a large reniform 

 spot, that occupies almost the whole upper side of the eye, is of a black colour and there is 

 a small tubercle in the notch of the reniform spot. 



6) The joints of the upper antennular flagellum are of a more slender shape. 



7) The scaphocerite (Fig. 65/) 1,45 mm. long and 0,64 mm. broad, measures a little more 

 than one-third the length of the carapace and is 2,3-times as long as broad; the antero-internal 

 angle of the lamella is more pronounced, though obtuse, and exceeds slightly the terminal 

 spine. Antennal peduncle as long as the scale. 



8) The peraeopods of the i^' pair (Fig. 657), that reach only by one-fifth the propodus 

 beyond the antennal scale, are of a stouter shape. Propodus of subchela 1,6 mm. long and 

 0,48 mm. wide in the middle, not yet half as long as the carapace and 3,33-times as long as 

 broad in the middle; "thumb" measuring '/c ^^^ length of the propodus. 



9) The exopodite of the 2"'' pleopod is 1,2 mm. long and 4,6-times as long as wide 

 proximally, showing the same form as in the type; the endopodite is half as long and 4-times 

 as long as broad, but, being implanted at a lower level, reaches only along the proximal fourth 

 of the exopodite. No trace of stylamblys. 



The principal differences are the absence of the i s' o r upper lateral spine 

 of the carapace and the stouter shape of the i^' pair of peraeopods, while the others 

 are no doubt partly owing to the difference of age. In neither of the two specimens the upper 

 antennal flagellum shows the characters proper to the male : e.xcept the first, the joints of this 

 flagellum appear, indeed, in the male of other species much broader than long, but in both 

 specimens from Stat. 253 they are longer than broad. 



When therefore the two specimens belong to the same sex, the smaller one should be 



