M 6 



posterior. The very deep, uninterrupted, cervical groove is situated, indeed, much more 

 backward and is curved forward in the middle, nearly as in Nephropsis rosea (C. Spence Bate, 

 PI. XXIII, Fig. 2); measured in the mid-dorsal line, its distance from the concave posterior 

 border of the carapace proves to be one-third the length of the latter. According to Alcock 

 the cardiac region shonld be faintly carinated in the middle line, in the young specimen from 

 Stat. 76 a carination is not yet perceptable, but there is a small tubercle in the middle line 

 posteriorly, immediately before the smooth, flattened and somewhat elevated band that traverses 

 the posterior and infero-lateral borders of the carapace. The groove that defines posteriorly and 

 inferiorly the hepatic lobe like also that by which the former communicates with the cervical sulcus, 

 are rather deep. The branchial regions are strongly flattened and almost vertically deflexed 

 downward; they are separated from the cardiac region by a distinct granulated ridge and inferiorly 

 by a prominent, slightly arcuate, granulated, but obtuse carina, that runs not far from and 

 parallel with the lower border of the carapace until the lower end of the cervical groove. The 

 carapace is covered with small, acute granules, mostly tipped with a fine hair, and these granules 

 are somewhat larger and more crowded on the cardiac and branchial regions than anteriorly; 

 near the anterior margin of the carapace the granules are very rare, the surface appearing here 

 almost smooth. Near the upper extremity of the hepatic groove, immediately behind the level 

 of the gastric tubercle, the carapace presents on each side a small sharp spinule; when a line 

 uniting this spinule with the large spine at the base of the rostrum is continued backward to 

 the cervical groove, the described spinule proves to be almost twice as far distant from the 

 cervical groove as from the spine at the base of the rostrum. 



In the Report on the Challenger Macrura the rostrum is described as being armed on 

 each side with two large and seven small teeth, in figure 3 of Plate XXIII these teeth stand 

 indeed on the lateral margins themselves; I suppose, however, that these teeth are those with 

 which the ridges are armed that are continued on to the gastric region and this opinion agrees 

 with Alcock's description. 



The abdomen is very little shorter than the carapace, the rostrum included. The terga 

 of the first five somites are smooth, though rather coarsely pitted ; the 2 nd , the 3 rd and the 

 4 th are provided with a shallow transverse furrovv, which is interrupted in the middle and which 

 runs somewhat nearer to the posterior than to the anterior border. The anterior angle of the 

 i st somite is produced to an obtuse tooth, but the posterior angle bears a sharp spine. The 

 terga are separated from the pleura by prominent, longitudinal crests. The anterior border of 

 the 2 nd pleuron carries a sharp tooth, that of the 3 rd is a little smaller and somewhat farther 

 distant from the lower extremity, the anterior border of the 4" 1 carries a very small granule 

 instead of a spine and a quite minute granule occurs on the anterior border of the 5 th pleuron. 

 A transverse groove bordering the anterior margin of the 2 nd — 5 th somites (which, however, is 

 rather indistinct on the 5 th ) passes downward on to the pleura, just near their anterior border, 

 about to the middle of these plates; the ridge between the anterior border and this furrow is 

 granular on the 2" d pleuron, but smooth on the following. A row of small granules runs down 

 on the pleura from the transverse crest that separates them from the terga, to the lower 

 extremity and this row of granules occurs also on the i st somite. The posterior border of the 



