288 Proceedings of the Royal Physical Society. 



Cytherura acuticostata," and in support of this view they 

 state that though they do not have very young examples of 

 that species to compare it with, a very fine series of the 

 young of the C. cornuta shows that "the beak occupies a 

 much larger proportion of shell, and is thus more promin- 

 ently conspicuous " in the young of the Cytherurm, and " that 

 the lateral projections are also more acute than in the adult." 1 

 These remarks are supported by an indifferent outline side- 

 view of young forms of C. cornuta and C. nigrescens, but 

 I think for the purpose of comparison a dorsal view should 

 also have been given. I am, however, not extremely anxious 

 whether the " species " stands or not, and therefore will not 

 discuss its merits here. There are one or two points, however, 

 that may be referred to — (1st) If a careful comparison of 

 the original figures of C. bodotria be made with those of 

 C. acuticostata given on plate xxxii. (figs. 12-15) of Dr Brady's 

 excellent " Monograph of recent British Ostracoda," published 

 in the Transactions of the Linnean Society, 1868, it will be 

 seen that C. bodotria is proportionally more elongated and 

 more depressed, and that, when seen from above, the lateral 

 angles are remarkably prominent and not like the species 

 it is said to be the young of; but (2nd), and leaving these 

 differences meanwhile out of account, and taking for granted 

 that Cytherura bodotria is the young of Cytherura acuticostata, 

 then from what happens with other species one might expect 

 these young to be smaller than the adult, but they are 

 not so. The length of the specimen of C. bodotria represented 

 by our drawings in Part III. of the Eighth Annual Report of 

 the Fishery Board for Scotland was '5 mm., and the size of 

 C. acuticostata as given in the Monograph already referred to 

 at page 446, and which I suppose represents the adult size, 

 is the ^Vth of an inch, so that this supposed young form is 

 as big as the one full grown. 



But I had even a better and larger specimen of C. bodotria 

 than the one figured, though it was similar in form and 

 sculpture, and it would have been figured instead, but it was 



1 I have two smaller (younger) specimens of C. bodotria, and these have 

 the lateral projections less developed than in the one figured, though other- 

 wise similar to it. 



