Chilton. — Some Australian and New Zealand Gammaridae. 369 



species, tlie store specimen and some of the dredged specimens being 

 M. mastersii, the second gnatliopod of the shore specimen being figured 

 by Mr. Thomson in pi. 17, fig. 46 ; the other dredged specimens belong 

 to M. inaeqiiipes (A. Costa). 



The second gnathopoda of the female in M. mastersii are of moderate 

 size, and probably not markedly different from those of the male, but the 

 specimens at my disposal are not sufficient for the satisfactory working- 

 out of the sexual differences. 



Ceradocus rubromaculatus (Stimpson) 



Ceradocus rubromaculatus Stebbing, 1910a, p. 598 (with synonymy) ; 

 Chevreux, 1908, p. 479. Moera spinosa Chilton, 1883, p. 81, 

 pi. 2, fig. 3a. 



This appears to be a common species on the coasts of Australia, and 

 it is occasionally found in New Zealand. 



I have specimens from Auckland (H Suter and W. K. B. Oliver) ; 

 Eangitoto Reef, Auckland (W. R. B. Oliver) ; Dunedin (G. M. Thomson) ; 

 Chatham Islands (H. B. Kirk) ; and Akaroa (C. Chilton). 



The species can be distinguished from others likely to be confused with 

 it by the serrations on the segments of the pleon. The first gnathopod 

 has the inner surface of the carpus covered with short tufts and comb-like 

 rows of setae arranged on the same general plan as in Maera inaequipes, 

 but there is no excavation on the anterior margin. The second gnathopoda 

 have the propod large in both sexes, but larger in the male, in which the 

 palm bears 2 or more flat-topped teeth ; but there appears to be consider- 

 able variation in the armature of the palm. In the specimens I have ex- 

 amined the palm is quite oblique, but M. Chevreux has described a form 

 from the Gambler Archipelago in which the gnathopoda of the two sides 

 are unequal, the larger having the palm transverse with 2 narrow exca- 

 vations, the smaller being not unlike that of the female. I had pointed 

 out the same inequality in the gnathopoda of the male in the specimens 

 from Auckland recorded in 1883 under the name Moera spinosa. In 

 M. Chevreux' s specimens the basal joint of the last pair of peraeopoda is 

 rather narrow, and is produced downwards into an acute narrow tooth. 

 The same tendency is noticeable in Australian and New Zealand forms, 

 but in them the joint is wider and the downward prolongation not so 

 narrow. 



References. 



Chevreux, E. 1900. " Amphipoda " in Resultats des Campagnes Scien- 

 tifiques par Albert 1^"" de Monaco, fasc. 16. 



- 1908. Mem. Soc. Zool. de France, vol. 20, pp. 470-527. 



Chilton, C. 1884. Proc. Linn. Soc. N.S.W., vol. 9, pp. 1035-44, pi. 46 

 and 47. 



1883. Trans. N.Z. Inst., vol. 15, pp. 69-86, pi. 1-3. 



1911. Trans. N.Z. Inst., vol. 43, pp. 546-73. 



1912. Trans. N.Z. Inst., vol. 44, pp. 128-35. 



Delia Valle, A. 1893. " Gammarini " in Fauna und Flora des Golfes von 



Neapel, Monographic 20. 

 Haswell, W. A. 1879. Proc. Linn. Soc. N.S.W., vol. 4, pp. 319-50, 



pi. 18-24. 



1885. Proc. Linn. Soc. N.S.W., vol. 10, pp. 95-114, pi. 10-18. 



