PHILOMEDES. 



43 



VIII. PHILOMEDES, Lilljehorg. 



?Cypris, NicoJet, 1849. 

 Cypkidina, Baird, 1850. 

 Philomedes, Lilljehorg, 1853, 

 Cypridina, Bana, 1855. 

 Philomedes, Norman, 1861. 



— G. O. Sars, 1865. 



— G. S. Bradij, 18G7, 1868, 1871. 



Carapace subcylindrical S , or ovate 9 ; frequently spined or apiculate posteriorly ; 

 notch deep and large. One known form {Ph. Folinii, Brady) has a coarsely ridged and 

 deeply pitted carapace. See page 8. 



1. Philomedes Bairdiana. Sp. nov. Plate IT, figs. 30, 31 a, b, c. 



Carapace-valves suboblong, compressed; excised by a broad antero-inferior sinus; 

 and impressed by a medio-dorsal furrow. Edge-view of carapace narrow-oblong, with 

 elliptical ends ; end-view obovate. 



This resembles some published figures of PJiilomedes interpuncta $ ; but the 

 specimens, not being free of the matrix, are apparently without the usual posterior spine 

 or process ; the notch, also, is too broadly rounded, though the gape is smaller ; and the 

 nuchal furrow is rather too strong for Ph. interpuncta. 



Length -l^; height \\ thickness -j^j inch. Proportions 10 : 5 : 3^. 



We dedicate this interesting Cypridinad to the memory of our deceased friend Dr. W. 

 Baird, by whom the knowledge of Entomostraca was so greatly advanced. 



Ph. Bairdiana occurs as grey shells (two) in the grey Carboniferous Limestone of 

 Little Island, Cork, Collected by Mr. Joseph Wright, F.G.S. 



IX. RHOMBINA. Gen. nov. 



Belonging possibly to the Cypridinada, but differing in shape from any of the fore= 

 going genera, there are some rare specimens of carapace-valves obhquely oblong or rhom- 

 boidal in profile, and rather compressed, which have a shght sinus and a mere trace of 



