240 Surg.-Capt. A. Alcock on 



of the propodite are smooth, except for a subterminal tubercle 

 on the U])per edge. 



Colour in life bright pink. 



A female from Station 108, 1043 fathoms, measures 

 50 raillim. from rostrum to tip of telson in the median line. 



70. Pentacheles phosphorus '^ J sp. n. 



Carapace above nearly smooth, pubescent, especially at the 

 lateral margins and below ; its greatest breadth, which is just 

 in front of the cervical groove, is more than two thirds of its 

 greatest length ; the median carina ends in a double rostral 

 spine, between which and the cervical groove is a line of four 

 spines, of which the penultimate is double, and behind the 

 cervical groove are three pairs of spines, the last pair standing 

 rather wide apart from each other on a distinct bifurcation of 

 the carina ; the frontal margin is smooth, except for a single 

 spine at the inner angle of each orbital notch ; the posterior 

 margin is broad ; the lateral margins are setose and spinate, 

 the spines numbering 6 (very rarely 7) + 3 (rarely 4) in front 

 of the cervical groove and 6 or 7 behind it ; the gastric 

 region is bounded on each side by a sinuous row of six large 

 spines, and the cardiac region by an oblique, low, denticulate 

 ridge j the branchial regions ai'C traversed dorsally by a 

 perfectly straight seven-toothed sublateral ridge, and veutrally 

 by the two usual serrated crests. 



The abdominal terga are smooth, all, including the anterior 

 part of the telson, are strongly carinated, the carinaj of the 

 iirst four culminating in procumbent spines, that of the fifth 

 being, like that of the telson, simple, and that of the sixth 

 being double, with the edges crenulated ; the terga from the 

 second to the fifth inclusive are obliquely and very deeply 

 cleft on each side of the median carina. The abdominal 

 pleurae have the surface smooth and the setose margin denti- 

 culate ; each is strengthened by a very salient midrib. 



The orbital notches are broad and deep, smooth-edged, and 

 broadly rounded behind; the ophthalmic peduncles have a 

 small tubercle at the frontal level. 



The basal joint of the antennules has a single spine at the 

 antero-extcrnal angle ; its scale is not very much larger than 

 the antennal scale, both ending in very sharp spines. 



All five pairs of thoracic limbs are chelate. The great 

 chelipeds are longer than the body ; the meropodite has in 



* This sjjecies is figured in " Illustrations of the Zoology of the Royal 

 ludiau Muriue Steamer * Investigator,' Crustacea,'" pt, ii. (plate viii.), to'be 

 issued early this year. 



