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



only indicated by a few epibrancliial spinelets. The Unea 

 onomurica is not apparent without dissection. The chelipeds, 

 Avhich agree in all essentials with P. Cuvieri, and the first 

 three ])airs of legs, which are very long and slender and armed 

 with spines along both edges of the meropodites, are hairy, the 

 former equally so throughout, the latter chiefly on the mero- 

 podites. The last pair of legs is weak, unarmed, and almost 

 devoid of sets, and differs from those of all the other species 

 of the group with which we are acquainted in the form of its 

 subchelffi, in which the dactylus is minute and folds back 

 upon the slightly enlarged distal end of the propodite ; its 

 meropodites when laid forwards reach the spines of the 

 antero-lateral margin. 



The eggs are very small, and in the only ovigerous female 

 examined are present in such volume as to cause the complete 

 extension of the abdomen. 



Colours in life pale pink, with the fringes of the chelse 

 black. 



Male. Female, 



millim. millim. 

 Lengtli of carapace from apex to hinder 



margin 16'25 20'o 



Breadth between spines at junction of 

 arched fore- with parallel hinder- 

 sided part 13-25 17 



Length of chelipeds 36 42 



Expanse of legs 115 120 



Four specimens, two males and two females, of which only 

 one pair is in good order, were obtained at Station 105, depth 

 740 fathoms. 



Order ISOPODA. 

 Family Bathynomidae. 



50. Bathynomus giganteus, A. M.-Edw. 



Bathynomus gigantetis, A. Milne-Edwards, Comptes Rendus, 1879, 

 t. Ixxxviii. pp. 21-23; A. Agassiz, Three Cruises of the 'Blake,' 

 1888, vol. ii. p. 49, fig. 252. 



Three females of this remarkable form were taken at 

 Station 105, in 740 fathoms. They measure 160, 195, and 

 200 millim. respectively in length, in a straight line from the 

 front of the head to the extremity of the telson. As the 

 genital apertures are not traceable, and as the largest oostegal 

 plate measures only 8 millim. in length in the largest speci- 



