51 



The " andricum " is of the same general character as that of 8. bisulcatus : 

 the most noticeable difference is, that one of the booklets into which the middle 

 lobe splits up has a foliaceous base. 



(The external maxillipeds and 5th pair of legs are missing in the only- 

 specimen). 



The branchial formula is as follows : — 



Total l+2ep. ? + 4 r. =8 + 4 r. + 2 ep. 



Colour in life, lurid red. 



The carapace is 30 millim. long, the abdomen 60 millim. in the mid-dorsal 

 line. 



Arabian Sea, 1091 fathoms. 



Eegd. No. ™. 



Though very similar to it, this species is not identical with 8. mollis S. I. 

 Smith, as I have ascertained by comparison with one of the duplicates from the 

 U. S. National Museum. 



« 



It differs from 8. mollis, as Faxon has pointed out, in that the posterior 

 pleurobranch of somite XII is a functional gill-plume instead of a rudimentary 

 filament. 



26. Sergestes rubvogattatus, Wood-Mason. 



Sergestes rubroguttatus, Wood-Mason, Ann. Mag. Nat. Hist., Nov. 1891, pp. 354, 355, fig. 10 : Hansen, P. Z. S. 

 1896, pp. 949, 955. 



Illustrations of the Zoology of the Investigator, Crustacea, Plate XLI. Fig. 5. 



Eostrum strongly ascendant, subacute, arising from a well defined areola 

 of its own, only just overhanging the anterior border of the carapace. 



Gastro-hepatic groove very distinct in all its course. The cervical groove 

 not visible on the dorsum of the carapace. A very strong longitudinal ridge 

 runs from the antennal margin halfway along the carapace, where it meets two 

 equally strong ridges, one of which curves upwards and defines the branchial 



