BY WILLIAM A. HASWELL, M.A,, B.SC. 105 



XIII. Megamcera Mastersii. 



Megamcera Mastersii, Haswell, Proc. Linn. Soc, N.S.W., Vol. 

 IV., p. 265, pi. XL, fig. 1. 



Megamo&ra Thomsoni, Miers, Zoology of H.M.S " Alert," 

 Crustacea, p. 318, pi. XXXIV., fig. 1b. 



These two forms are so closely related to one another that I 

 think they are scarcely to be regarded as distinct species. My 

 specimen of M. Mastersii agrees exactly with Miers's description 

 and figure, except that the spinules on the pleon are absent, and 

 the telson has on each division only a single notch placed near the 

 extremity, with a short setule. 



XIV. McERA SPINOSA, McERA RUBRO-MACULATA, and MCERA 



Ramsayi. 



(Plate XV., figs. 5-12.) 



The diff"erences on account of which the first and last of these 

 forms were separated from the second were mainly in the form of 

 the posterior gnathopoda. I find, however, on examining a series 

 of specimens, a perfect series of gradations in this respect from the 

 form figured by Stimpson to typical forms of M. spinosa and M. 

 Ramsayi. Some of these varieties are figured in outline in the 

 plate. 



Mr. Chilton's M vera f estiva belongs also to this very variable 

 species. (Proc Linn. Soc, N.S.W., Vol. IX., p. 1037, pi. XLVL, 

 fig. 2.) 



XV. Xenocheira fasciata. 



(Plate XVL, figs, 1-3.) 



Xenocheira fasciata, Haswell, Proc. Linn. Soc, N.S.W.. Vol. 

 IV., p. 272, pi. XI., fig. 6. 



I give here an enlarged figure of the posterior gnathopoda, the 

 remarkable form of which distinguishes the genus. 



