380 Rev. A. M. Norman on Podophthalmia and Entomostraca. 



Subclass ENTOMOSTRACA. 



Fam. CjrpridinidsB. 



Genus Cypridina, Milnc-Edvvards. 



Cypridina teres, n. sp. PI. XIV. fig. 10. 



Ovata, infra medium vix latior, Isevis, alba ; oris incisura stricta, 

 descendens, recurvata. Animal incognitum. Long. -Jj- unc. 



Shell ovate, not produced, very slightly widening just below 

 the middle, quite smooth, pure white, moderately and regularly 

 convex. Oral slit narrow and somewhat semicircular in form. 

 Length y'j inch. 



The nearest ally to this species is perhaps Cypridina Marice 

 (Baird) ; but the form of the latter is more produced, narrower 

 in proportion to its length, of more equal breadth throughout, 

 and much more tumid. 



Cypridina teres w^as kindly added to my collection by the Rev. 

 R. N. Dennis, who found it among shell-sand which had been 

 dredged at Oban. 



Genus Piiilomedes, Lilljeborg. 



The genus Philomedes is distinguished from Cypridina by the 

 antennae, which are furnished with a remarkable, long seta. 



Philomedes longicornis, Lilljeborg. PI. XIV. fig. 11. 



Philomedes longicornis, Lilljeborg, Cladocera, Ostracoda, ock Copepoda i 

 Skane, t. 26. figs. 4, 5 (1853). 



Shell subquadrangular-ovate, slightly convex. Anterior mar- 

 gin generally retuse, but sometimes rounded ; dorsal and ventral 

 margins moderately arched ; posterior margin obliquely truncate, 

 the ventral angle being the lower, A short sj)ine is frequently, but 

 not always, present at the dorsal angle of the posterior extremity. 

 Oral aperture wide, gaping, triangular. The surface of the shell 

 seems to be always more or less excavated with large irregularly 

 disposed circular or subcircular pits, which in aged examples are 

 often confluent and form large scars. Length ~ inch. 



I met with this species, now first added to the British fauna, 

 in some numbers among dredged stuff sent to me by W. Webster, 

 Esq., from Plymouth Sound, on account of its containing Chern- 

 nitzia fenestrata and Odoslomia acuta in great abundance. I am 

 indebted to Dr. Baird for pointing out to me the identity of the 

 Plymouth Entomostracan with Lilljeborg's species. 



In concluding these descriptions, I must return my best 

 thanks to my friend Mr. Hodge for the valuable assistance he 

 has given me in illustrating the paper. 



