148 



THETIS SCIKNTIFIC RESULTS. 



P. tuherculatus 



P. sternicostulatus 



acute 



truncate 



smooth 



closely granular 



one 



six 



glabrous 



densely setose 



rounded 



keeled 



few 



many 



short 



long 



four 



three 



as long as deep ; the basal lobes on the inner edges of the fingers 

 are wanting, and the post-abdomen has a marginal fringe of setae. 



Length of carapace 4U mm., breadth 31 mm. 



The differences between this species and Pay-amithrax sterni- 

 costulatus, M. Edwards, to which it is closely allied, may be 

 enumerated as follows : — 



External orbital angle ... 



Inferior surface of body and sides of 



branchial region 

 Number of depressions in sternal plate 



between insertion of the chelipedes 



and buccal orifice ... 

 Post-abdomen and maxillipedes 

 External ridge on carpus of chelipedes 

 Hooked setce on body and limbs 

 Spines of rostrum and on posterior 



border of carapace .. 

 Number of spines on branchial margin 



Colour. — In spirit, ground cream, more or less tinted with light 

 red, becoming deep red in the median line of the carapace. 



Sixteen examples were obtained. The range extends from 

 Broken Head to Wata Mooli, the depth varies between 20 

 and 78 fathoms. 



N A X I A, Milne Edioards. 



NAXIA (NAXIOIDES) ROBILLARDI, Mieo^s. 



Naxia (Naxioides) robillardi, Miers, Proc. Zool. Soc, 1882, p. 339, 

 pi. XX., figs. 1 and la, \h, \c. Pocock, Ann. Mag. Nat. 

 Hist., (6), v., 1890, p. 79. 



Stations 20, 21, 22, 24. 



Nine specimens — five males and four females — were obtained 

 off Morna Point and in the Newcastle Bight at depths varying 

 from 21 to 48 fathoms. The examples are smaller than the types, 

 from which they do not otherwise differ. In the largest male 

 the carapace is 55 mm. long and 40 mm. broad ; the rostral spines 

 measure about 40 mm. The first ambulatory limbs ai'e 150 mm. 

 in length. 



Hitherto only recorded from Mauritius. 



