Nuviculacsa.] iNFrsoniAL animalcules. 327 



CampT/lodiftnifi, and placed in Surirella, several species possessing this 

 character, apparently for no other reasons than that the stria3 or 

 costae are confined to the margins of the valves, and are parallel, not 

 radiate. When we consider that the striae are often exceedingly 

 difficult of detection, and that their direction, merely, cannot be 

 regarded as necessarily implying an important difference in internal 

 structure, the circumstances alluded to do not seem a sufficient ground 

 of exclusion, and it -would perhaps be as well to allow Campyhdiscus 

 to include all those species with equidistant valves, to which its 

 very significant name can with propriety be applied." (Ami. Nat. 

 Hist. V. 7, 1851.) 



Campylodisctjs radiosus. — Small ; its centre smooth, and sending off 

 about seventy closely set and broad rays. Fossil. Vera Cruz, Mexico. 



C. (?) striatus. — Centre smooth as in preceding, with two series 

 of thirteen parallel transverse striae on each side of a clear interval. 

 Fossil. Vera Cruz, Mexico. 



C. Clypeus. = Cocconeis clypeus. — Sub-orbicular ; with the rays 

 interrupted (broken) by a smooth band ; punctato-rcticulate at centre 

 of disc. Diameter l-576th. to l-216th. Fossil in Franzensbad 

 Bohemia. Original drawings of this elegant fossil are given in 

 P. 12. f. 516, 518. 1 ' 



C. noricKs. — Sub-orbicular, with continuose (unbroken) rays, seven 

 in l-1152nd. ; smooth at the centre. Diameter l-432nd. Alive at 

 Saizberg. Fossil at San Fiore. 



C. Remora. — Sub-orbicular ; rays interrupted ; centre of disc- 

 smooth. Diameter 1 -480th. Alive at Wismar, on the Baltic. 



C. EcJieneis. — Sub- orbicular, porous ; having continuous rows of 

 pores extending from the smooth, solid, central area. Diameter 1-2 8 8th. 

 "Wismar, Baltic. Alive. 



C. vulcanicus.—'Lax^e, sub -orbicular; centre smooth; margin wide,, 

 with about foi^ty-two rays. Diameter 1 -480th. Peru. 



C. hihernicus. — Testules large, sub-orbicular, with continuous 

 (unbroken), loosely disposed rays, four in 1-1 152nd. Rays rough; 

 centre smooth. Ireland. 



The following species have been recently described by the Eev. 

 "W. Smith. 



C. co-status. — Valves orbicular ; costte distinct, radiate, about forty- 



