762 



SYSTEMATIC HISTOET OF THE INFUSOEIA. 



E. Lindiffii (Rab.). — Minute ; front 

 view orbicular ; costse 6 to 7. Rab Diat. 

 p. 19, pi. 1. f. 20. Bogota. 



E. Sancti Antomi = Eimotia Sancti 

 Antonii, EM. pi. 34. 5. f. 7, &c. Ame- 

 rica. Front view rectangular, with 

 conspicuous marginal capitate striae; 

 valves obtusely lanceolate, straight, with 

 strong transverse costae. Probably a 

 Denticula. 



E. Beatorum= Eunotia Beatorum, EM. 

 pi. 34. 5. f. 8. America. Front ^dew 

 rectangTilar, with marginal gland-like 

 puncta. According to Ehrenberg, this 

 species is allied to E. Sancti Antonii. 



E. Lumda = Eunotia Lunula., EM. 

 pi. 33. 7. f. 9, & pi. 33. 14. f. 8. Ehren- 

 berg's figures dilfer considerably. The 

 first is slightly arcuate, elongated, with 

 obtuse, slightly recurved ends; the se- 

 cond is smaller, lunate, rapidly tapering 

 to the obtuse ends. Both have radiant 

 costae ^vithout intermediate dotted lines. 



E. mesoJepta = Eunotia mesolepta, EM. 

 pi. 9. 1. f. 26.^ Fossil. France. Valves 

 elongated, slightly cm'ved, with attenu- 

 ated middle, and conic ends ; costse alter- 

 nating with dotted striae. 



E. mesogongyla = Eimotia mesogorigyJa, 



EM. pl._ 9. 1. f. 27. Fossil. France. 

 Valves linear, elongated, slightly curved, 

 with gibbous middle, and rounded ends ; 

 costse alternating with dotted striae. 



E. ? Fahti (E., K.).— Valves semioval, 

 slightly arcuate, with obtuse, very slightly 

 recurved apices, and 9 moniliform striae 

 in 1-1200". = Eunotia Faba, EM. Seve- 

 ral figures. Ehrenberg's figure seems to 

 us rather to represent a Emiotia than an 

 Epithemia. 



E. ? cingiilata (E.,K.). — Small,smooth, 

 with convex dorsimi and tumid connect- 

 ing zone. KB. p. 36. = Eunotia ? cm- 

 gulata, EA. p. 126, t. 2. 6. f. 34. North 

 America. Aldn to E. gihherula, E. 



E. Cocconema = Eunotia Cocconema, 

 EM. pi. 34. 7. f. 1. Canton. Valve 

 stout, semilunate, with regularly convex 

 dorsum, straight venter and rounded 

 ends, strong costae, fine intermediate 

 striae, and a longitudinal blank line. 



E. Cistula = Eunotia CistuJa, EM. 

 pi. 8. 1. f. 5, &c. Asia. Front view ob- 

 long or elliptic, with costate margins ; 

 valves stout, lunate, with obtuse ends, 

 strong, radiating costae, and a blank 

 longitudinal line. 



Genus EUNOTIA (E.). — Fnistules free, in fi^ont view qnadi'angular, in 

 lateral view Innate, or arcuate, and striated. In form, Eunotia is allied to 

 Epithemia ; bnt the lateral snrfaces of the frnstnles are merely striated, and 

 want the conspicnons costae of that genus. The superior margin is usually 

 imdulated, — an appearance caused by transverse depressions. The fi^ustules 

 are not adnate, and in the front view do not appear beaked. 



"We believe that the species in this genus, as in several others, have been 

 founded upon insufiicient characters, and that those forms which diifer only 

 in the undulations should, as Professor Bailey suggests, be regarded as 

 varieties. As this work, however, is intended to include aU generally 

 admitted species, we are content to indicate our opinion, the correctness of 

 which must be determined by futui'e observations. Kiitzing and Meneghini 

 describe the transverse section as trapezoidal, and regard it as an important 

 generic character ; but we agree with. Professor Smith in doubting the occur- 

 rence of such a form. Several species of Eunotia have been found by Bailey 

 and Brebisson united into short bands ; and unless the generic characters of 

 Eunotia and Himantidium can be strengthened, it will become necessary to 

 reunite these genera. The dorsal elevations in Eunotia and Himantidium 

 appear, in the front view, transverse darker bands. 



rica. Akin to E. nodosa, but with in- 

 flated and straight apices. E. 



E. veyitralis (E.). —Valves elongated, 



* Dorsal margin of valves 7iot dentate. 



Eunotia nodosa (E.). — Valves slightly 

 arcuate, with inflated centre and reflexed 

 obtuse apices. ERBA. 1840, p. 15, & M. 

 pi. 15 B. 3. f. 25. Asia and America. 

 Lough Mourne deposit. 



Fj. Formica (E.). — Valves linear, with 

 inflated centre and ends. EA. p. 126, 

 & M. pi. 3. 4. f. 18. Australia and Ame- 



lineai", curved, with tumid, rounded 

 apices, and gibbous venter. EA. p. 126, 

 & M, several fio-ures. Europe, Asia, 

 Africa, and America. 



E. Luna (E,). — Valves linear, Innately 

 cui-ved, with simply convex dorsum, 

 2-ibbous venter, and obtuse apices. 



