146 " THETIS " SCIENTIFIC RESULTS. 



armature of the carapace and limbs is if anything more pronounced 

 in the young than in the adult ; the spines appear proportionately 

 longer, but this appearance is due to their bases being narrower 

 and not so much swollen and elevated as in the adult. This 

 species appears to be quite distinct from any hitherto described. 



P A R A M I T H R A X, Milne Edwards. 



PARAMITHRAX TUBERCULATUS, sp. nov. 



(Plate xxxiv., figs. 1, 2.) 



Stations 10, 35, 37, 41, 42. 



Rostral spines short, acute, slightl}'' divergent, about twice as 

 long as broad at the base. 



Carapace subpyriform, about one-fifth longer than broad ; 

 regions prominent and sharply defined ; inner limit of branchial 

 with four equidistant pits, and a large depression on each side of 

 the intestinal region. Upper surface with numerous tubercles 

 and a few spines ; there is a median series of three spines, two 

 on the gastric and one on the cardiac ; the latter region is 

 centrally surmounted by an elevated, transverse, confluent pair, 

 and a small pair is present on the posterior border. 



A series of submedian tubercles is disposed as follows : — Two 

 widely separated pairs on the interorbital space, a pair about their 

 height apart on the anterior, and four equidistant in a transverse 

 line on the posterior gastric region, and a pair on the intestinal, 

 situated immediately in front of a median subspiniform tubercle. 

 Upper orbital border, hepatic, anterior cardiac and branchial 

 regions with numerous small tubercles ; a few of a larger kind 

 are scattered on the gastric and branchial regions. 



The tubercles are clothed with minute granules, and are sur- 

 mounted with hooked hairs. 



Inner orbital fissure twice as long as wide, bounded on the 

 inner side by a short triangular tooth, and on the outer by a 

 granulose spine ; outer fissure deep, narrow, and almost closed 

 above ; external orbital angle acute but not spinose. 



Hepatic region prominent, with two short lateral spines and a 

 few granules on the swollen inferior surface. Margin of branchial 

 region bearing four spines, rather more than twice their length 

 apart ; first and second compressed, granulose superiorly ; third 

 and fourth smooth, conical, the last one arising from a broad 

 elevated base. 



