82 



above. Of Scyll. Martensii the antennular segment is broader, 3- or 4-times as broad as long; 

 the median notch is broader, less deep, the anterior margin is in young individuals a little 

 prominent on each side of it, nearly straight in the adult, but there is no carinate tooth. 



The areolated, posterior part of the i st abdominal tergum is distinctly smaller 

 than the smooth, anterior part; the posterior area appears as long in the middle as 

 laterally, whereas in Scyll. Martensii it is much longer in the middle. It is divided on each 

 side by a dozen furrows into as many areolets, that are little longer than broad; these furrows 

 run parallel with one another and with the middle line of the abdomen, whereas in 

 Scyll. Martensii they show an oblique direction with regard to the middle line (compare fig. 12 

 with fig. 13^ on Plate III). The 2 nd — 5 th abdominal terga are obtusely carinate in the middle 

 line, the carinae, however, are not at all salie nt; the carinae of the 2 nd and 3" 1 terga are 

 notched posteriorly, the quite narrow furrow reaches in the former almost to the middle, but in 

 the other it is much shorter. In Scyll. Martensii the carinae are much more prominent, especially 

 that of the 3 rd somite. On each of these four somites the obtuse carina in the micldorsal line 

 appears as the trunk of a regular and symmetrical, arborescent figure, which in 

 Scyll. Martensii is rather indistinct or absent. As regards the sculpture and areolation of the 

 2 nd — 5 th abdominal terga and pleura, in tvvo transverse series on the terga and in a marginal 

 series on the pleura, Scyll. óicusj>idaius almost fully agrees with Scyll. Martensii, it should, 

 however, be remarked that the furrows of the posterior series of the 2 nd tergum run nearly 

 parallel with the middorsal line of the abdomen, ,whereas their direction is very oblique in 

 Scyll. Martensii. The shape of the 2 nd — 5 th pleura is also the same in both species, but the 

 lower extremity appears rather sharp in Scyll. bicuspidatus, except the 5 th . The abdominal 

 terga of Scyll. Martensii are slightly broader in proportion to their length than in this new 

 species. The sculpture of the ó th somite and of the anterior, calcified part of the telson does 

 not much differ from Scyll. Afartensii, but the calcified part of the telson ends posteriorly in 

 four acute spines, of which those at the end of the lateral margins are a little shorter 

 than the two internal ones; the basal joint of the uropods and their outer border terminate 

 also in acute spines. All these spines are wanting in Scyll. Martensii. 



The internal antennae agree with those of Scyll. Martensii, but the two last joints of the 

 peduncle and the joints of the slender fiagellum are comparatively broader than in Pfeffer's species. 



The tooth on the middle of the basal joint of the outer antennae is very sharp, in 

 Scyll. Martensii it is less sharp. The 4 th joint, little longer than broad, 3% mm. long, 3 1 /» mm. 

 broad, is armed on its outer border with two sharp teeth, about as in Scyll. Haanii\ the 

 distance between their tvvo tips is a little shorter than the distance between the apex of the 

 anterior tooth from the distal extremity of the squame and than the distance between the apex 

 of the posterior tooth from the proximal end of the outer margin. Scyll. Martensii carries 

 four teeth on the outer border. The inner border of this joint is armed with five acute 

 teeth, the first of which is considerably larger than the following that 

 slightly decrease in si ze distally; there is also an acute tooth at the postero-internal 

 angle of this joint. This last mentioned tooth is obtuse and rudimentary in Scyll. Martensii and 

 the teeth on the inner margin show also different characters, because they bear each a secondary 



