90 DR. G. S. BRADY ON FRESHWATER [Feb. 2, 
slender of the two. The right valve is the smaller of the two, and 
has the dorsal margin less arched. The inner aspect of the valves 
shows a large shelf-like flange fore and aft. The terminal claws of 
the second pair of antennz are slender and finely pectinated on the 
inner margin. Postabdominal rami slender, with one long terminal 
claw, one short seta at the base of the claw, and one a little removed 
on the margin of the ramus. Margins of claws and ramus minutely 
pectinated. Shell thin, horny, of a smoky hue. (“Colour in life 
light-brown, with darker zebra-like markings.’ Prof. 2. Tate.) 
Length J of an inch. ; 
Collected by Prof. R. Tate in fresh water, at Kangaroo Island, 
Australia. 
Though quite abnormal in shape of shell, the soft parts of the 
animal agree in every important respect with those of the genus 
Cypris. 
Genus CHLAMYDOTHECA, de Saussure’. 
‘Testa undique pilosa, antice posticeque rotundata, appendice 
anteriore cum margine valvulz dorsali sensim coalescente, cum mar- 
gine ventrali autem angulum manifestum efficiente; appendice 
posteriore minima. Altitudo maxima pone medium et propius 
ventralem quam dorsalem marginem sita, exinde pars postica crassior 
quam antica. Margo ventralis vix sinuata, dorsalis valde armata. 
Impressio muscularis paulo ante medium sita.” 
The anatomical structure agrees exactly with Cypris. The author 
(de Saussure) refers to a paper by Sir John Lubbock, in which a 
similar species, Cypris brasiliensis, is described *. 
The genus Cypridea, Bosquet’, if not identical with, is at least 
very nearly allied to, the forms now under discussion. No undoubted 
recent specimens of Cypridea have, however, as yet been seen, and 
Prof. Rupert Jones, in a recent paper “ On the Ostracoda of the 
Purbeck Formation,’ * says that the “hinder margin is definitely 
straight along the middle third or more of the dorsal edge, with the 
hinge-angles more or less defined, and is oblique to the main axis 
of the valve. The left valve is the largest, and receives the dorsal 
edge and a straight ridge of the other valve in grooves on its dorsal 
and ventral contact-margins.”” These characters are not to be found 
in Chlamydotheca. Moreover, from the figures given by Prof. 
Rupert Jones, it seems that both valves of Cypridea are provided 
with the notch and hatchet-like anterior process, whereas in Chlamy- 
dotheca only the left valve is so formed. 
1 “ Mémoire sur divers Crustacés nonveaux des Antilles et du Mexique,” par 
M. Henri de Saussure. (Mémoires de la Société de Physique et d'Histoire Natu- 
relle de Genéve, 1856.) 
2 “On the freshwater Entomostraca of South America.” (Trans. Entom. 
Soe. Lond. new series, vol. iii. part vi. 1855.) 
3 “Hntom. fossil. des Terrains tertiaires de la France et de la Belgique.” 
(Mém. couronnés Acad. Royal de Belgique, vol. xxiv. 1852.) 
4 “ Ostracoda of the Purbeck Formation, with notes on the Wealden species.” 
(Quarterly Journal of the Geological Society, August 1885.) 
