PSEUDO-EUNOTIA. 305 



Desmogonium Guyanense Ehr. (Eul. Spec. Type, No. 151), which 

 is found in Asia, Africa, and America, in filaments like the Eunoiia of the 

 section Himantidium. The valves are inflated at the apices. We have only 

 noticed terminal nodules on one valve of the specimens in our possession. 



Upon the whole, we believe that these two forms ought to be included in 

 the genus Eunotia, notwithstanding the slight differentiating characters which 

 separate them from it. 



D. Rabenhortstianum Grun. (D. Ins. Banka, p. 6, pi. i, 



f. i*; H.L. Sm. Sp., Type No. 129, and Cleve and Mdller, No. 187), 

 plate 30, fig. 831. 



This diatom is found also in long filaments, it has very conspicuous 

 terminal nodules, valves slightly or not inflated at the apices, and margins with 

 large beads like the Arfinella. It appears to me to be intermediate between 

 Eunotia and Actinella. 



It is found in the Island of Banka and in China, in fresh water. 



GENUS 37. PSEUDO-EUNOTIA GRUN. 

 (1865 and 1882). 



Characteristics of Eunotia, from which it is dif- 

 ferentiated by the absence of terminal nodules. 

 Frustules solitary, free. 



Ps. Hemicyclus (Ehr.) Grun. (H.V.H. At!., 



Fl S- 68 - pi. 35, f. 23* ; in Types Nos. 262, 275. 



Pseudo-Eutiotia 

 Hemicyclus. 



Valve narrow, strongly arcuate, with apices inflated obtuse ; transverse 

 striae obtuse, finely divided transversely, 10-n in 1 c.d.m. 



Fossil. Scotland (Gregory), Sweden (Ehr.). 



GENUS 38. CERATONEIS EHR., 1840. 



Valve arcuate, with apices more or less rostrate- capitate 

 nodules distinct. Ventral margin generally inflated at the 

 central portion, showing a very distinct pseudo-nodule. 

 Pseudo-raphe straight. Frustule free, solitary, with girdle 

 face linear, narrow. 



Fig. 69. A sin S le s P ecies - 



Ceratoneis 



W 



A reus. 



