COLLECTED IN CETLON, 301 



extremities of the left valve. The end view of tlie shell is tri- 

 angular. Surface smooth, marked with large, closely-set punctures. 

 Colour green. Postabdominal rami extremely slender. Length 

 J^ of an inch (1'6 millim.). 



This and Gypris cylindrica are the two most abundant species 

 in Mr. Haly's gatherings. 



Between this species and the published drawings and descrip- 

 tions of Bosquet's genus Cypridea there are some not unimportant 

 discrepancies, particularly the straight hinge-margin and ovate 

 end-view of Cypridea. Moreover it would seem that the peculiar 

 notch and produced beak of Cypridea are quite apparent when 

 the two valves are in contact, which is scarcely the case in 

 G. suhglohosa. Indeed this character was not at all noticed by 

 Dr. Baird. On the whole, though G. suhglobosa must be recognized 

 as forming a most interesting link between Gypris and Gypridea, 

 we are perhaps scarcely warranted in referring it definitely to the 

 latter genus. In the soft parts of the aniaial I cannot, after 

 careful examination, discover anything to distinguish it from 

 Gypris. 



De Saussure's subgenus Ghlamydotheca'^ is founded upon a 

 species presenting exactly the peculiar shell-formation of G. suh- 

 glohosa ', and as a matter of convenience it seems desirable to 

 adopt the name either in a generic or subgeneric sense. Sir 

 John Lubbock also has described a species, Gypris hrasiliensis, 

 belonging to the same groupt. 



The fossil specimens described by Mr. Sowerby, some of which 

 Professor T. Hupert Jones has kindly allowed me to examine, 

 are, I think, undoubtedly identical with Dr. Baird's Nagpur spe- 

 cimens and with those collected by Mr. Haly at Colombo. They 

 are wonderfully well-preserved, and show the same sculpture as 

 the recent form, the most important diiference being that, when 

 viewed from above, the anterior extremity is (in some cases at 

 least) produced to a longer and more attenuated point. 



Grenus Ctpeinottjs, nov. gen. 

 Like Gypris except that the valves are very unequal, that of 



* Cypris {Chlamydotheca) azteca, Memoire sur divers Crustacea nouveaux 

 des Antilles et du Mexique, par M. Henri de Saussure (Memoires de la Societe 

 de Physique et d'Histoire Naturelle de Geneve, 1858). 



T " On the Freshwater Entomostraca of South America " (Trans. Entom. 

 Soc. Lond. iii. 1855). 



LINN. JOUKN. — ZOOLOGY, VOL. XIX. 24 



