AMPniPODA — STEBBING. 603 



ally of P. fiindersi, though differing in a few points, but the 

 mouth organs are not described, thus leaving it3 generic position 

 doubtful. 



PAR ADEX AMINE FLINDERSI (Stebbing). 



(Plate Hi.) 



Stations 35m, 57. 



Dexamine Jlindersi, Stebbing, Chall. Rep., Zool., xxix., 1888, 



p. 146, pi. clxxxvii. c. 

 Guerneajiindersi, Stebbing, Das Tierreich, xxi., 1906, p. 522. 



More than twenty years ago a fragmentary specimen obtained 

 by the "Challenger" Expedition from Flinders Passage, East 

 Australia, was doubtfully referred to the genus Dexamine. 

 Though the description and figures we're necessarily incomplete, 

 the species was thought worthy of a name, because, while making 

 a close approach to the genus mentioned, it did not in all respects 

 coincide with it. In 1906 it was transferred to the genus 

 Gtiernea, but still with hesitation, as in the long interval no 

 fresh material had come to hand. At length the "Thetis" 

 collection has remedied this defect. But even now all the new 

 specimens appear to be of the female sex, while, judging by the 

 second antennae, the original fragment is a male. 



In describing the female of Paradexaviine fissicauda from the 

 Antarctic He Wandel, Monsieur Chevreux gives the following 

 particulars : — sixth and seventh segments of the peraeon carrying 

 a medio-dorsal carina, ending in a little tooth, first three segments 

 of pleon with a similar carina ending in a strong tooth, flanked on 

 either side by another tooth, fourth segment with the median 

 carina forming a tooth larger than the preceding, the coalesced 

 fifth and sixth segments carrying two groups of dorsal spines ; 

 head almost as long as the first three segments of the peraeon 

 taken together, armed with a little sharp rostrum, lateral lobes 

 not very salient ] first four pairs of side-plates almost of the 

 same height as the segments which carry them ; postero-lateral 

 angles of the second and third pleon segments produced sharply 

 backward. All these particulars apply equally to the present 

 species, which is only one-fifth as long as P. Jissicaicda, and 

 differs from it in being much compressed, with the integument 

 not specially thick or rigid. The side-plates are all more or less 

 denticulate, and so are the postero-lateral margins of the first 

 three pleon segments. 



Eyes with very numerous components, pale in spirit. 



First antennie with first joint thicker and longer than the 

 second, which has an apical tooth not always very obvious, and h- 



