652 Bkady and Noiiman — Monograph of the Marine and Freshwater Ostracoda 



surrounding tlie outer edge. The caudal laminae are furnished with eleven 

 migues (PL Lv., fig. 11), edges of the larger ungues crenated, of the smaller 

 ciliated. 



The shell in the male yery closely resembles that of the female in form, but 

 the labiate projection of the infero-posteal portion is more pronounced, and 

 the whole form rather more elongated. The eyes are larger than in the female. 

 The antennules have the sensory appendage of fifth joint similar to that of the 

 female, and bear at their extremity two long (not reflexed) setae, and also two 

 two setae which are bulbously swollen at the base, from which rises an acutely 

 pointed spine-like process which gives attachment on the inner side to a saucer- 

 shaped appendage : from these set^ arise also long lateral processes, some of 

 which support saucer-shaped organs, usually three in number. The appendicular 

 branch of the antennae is similar to that of the female. 



There are, apparently, two forms of this species — (a) That here described, 

 which is tlie C. messinensis, and, subsequently, the C. mediterranea of Claus, and the 

 C. mediterranea of Sars, of which the ? is figured by us (PI. liv., figs. 3, 4). This 

 form we have from Naples (A. M. N.), and the Adriatic (Prof. Heller, in Mus. 

 Nor.), Messina (Claus); (i^) a form in which the shell is much less liigli in propor- 

 tion to the length, and regularly ovate (3 mm.), with the hinder extremity 

 regularly rounded, the greatest projection central (and no infero-posteal pouting 

 lips). When examining the shells only we came to the conclusion that tliis was a 

 distinct species, but a close comparison of the animals of the two forms showed 

 them to be exactly alike, and therefore we do not separate them. This form is 

 figured by us (PI. uv., figs. 1, 2). It was procured by us (A. M. N.) when at Naples 

 Zool. Stat, in 1887, and. appeared to be much more abundant there than form (a). 



Now, this latter form {b) closely agrees with Costa's figure of C. [Edwardsii) 

 mediterranea, which shows no infero-posteal labiate projection, and if it should 

 prove distinct from form («), must bear Costa's name. Meanwhile, we would call 

 this form (h) C. mediterranea (Costa), and form (a) C. mediterranea var. messinensis 

 (Claus). [G. W. Miiller has since this was written described form a under the 

 name Cypridina squamosa.~\ 



4. Cypridina angulata, G. 0. Sars. 



1887. Cypridina angulata, . . Sars, G. 0., " Nye Bidrag til Kunds. om Mid- 



delh. Invertebratf auna : iv. Ostracoda medi- 

 terranea," p. 43, 2d1. iii., figs. 1,2; pi. viii., 

 figs. 6, 7. 



" Shell of female, seen from the side, rounded-oval ; dorsal and ventral 

 margins regularly arcuate, equally high at the two extremities ; hinder margin 



