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 antennae 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. R. Tate.) 

 Length \ 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 valvulas dorsali sensim coalesceute, cum mar- 

 gine ventrali autem angulum manifestum eflficiente ; 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 hrasiliensis, 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. 



^ " M6moire sur divers Crustac^s nouveaux des Antilles et du Mexique," par 

 M. Henri de Saussure. (Memoires de la Society de Physique et d'Histoire Natu- 

 relle de Geneve, 1856.) 



- " On the freshwater Entomostraca of South America." (Trans. Entoin. 

 Soc. Lonrt. new series, vol. iii. part vi. 185.5.) 



^ " Entoiu. fossil, de.s Terrains tertiaires de la France et de la Belgique." 

 (Mem coiu'onnes Acad. Koyal de Belgique, vol. xxiv. 1852.) 



* " Ostracoda of the Purbeck Formation, with notes on the Wealden species." 

 (Quarterly Journal of the Geological Society, August 1885.) 



