190 Messrs. J. Wood-Mason and A. Alcock on 



and also shorter, barely reaching the apex of the basal joint 

 of the antennulaiy peduncle ; the cervical suture appears to 

 be more distinct in its dorsal part ; and the hooked spine of 

 the third abdominal tergum springs right from the anterior 

 end instead of from the middle of the crest. 



One female specimen from Station 97, 1310 fathoms. 



Colours in the fresh state bright orange. 



Length from tip of antennal scale to tip of caudal swim- 

 meret in a straight line 118 millim. ; length of exopodite of 

 first abdominal appendage 42 millim. ; length of carapace 

 from middle of posterior margin to tip of rostrum 32*5 millim. ; 

 length of third thoracic leg 46 millim. 



Family Sergestidse. 



Sergestes, Milne-Edwards. 



8. Sergestes bisulcatus, sp. n., Wood-Mason. 



Closely allied to 8. robustus and S. mollis, S. I. Smith, but 

 readily distinguishable from both in the cervical being no less 

 distinct across the back of the carapace than the gastro- 

 hepatic groove. It differs from S. mollis, and apparently 

 agrees with 8. robustus, in the relative proportions of the joints 

 of the antennulary peduncles and in the form and proportions 

 of the eyes, which are comparatively short and very distinctly 

 widened from base of peduncle to apex of depressed hemi- 

 spherical cornea ; and it agrees with 8. mollis and differs from 

 S. robustus in the size of the rostrum. 



Colour in the fresh state deep crimson-lake. 



A female from Station 100, 840 fathoms, and a male from 

 Station 105, 740 fathoms. 



Length of male from tip of rostrum to apex of telson 60 

 millim., of female 63 millim. 



9. Sergestes ? arcticus, Kroyer. 



Sergestes arcticus, Kroyer, Monoo\ Fremstill af Kraeb. Sergestes, pp. 24, 

 00, tabs. iii. and v. ; Spence Bate, ' Challenger ' Macnira, p. 430. 



Our only specimen wants the spine on the outer margin of 

 the exopodite of the caudal swimmeret said to be present in 

 S. arcticus. 



Colour in the fresh state deep crimson-lake. 



From Station 101, 922 fathoms. 



