12 BRITISH DIATOMACE^. 



1. Epithemia Hyndmanii, W. Sm. F. V. inflated; V. much and 

 regularly arched, extremities rounded, not recurved ; striae moni- 

 liform, 16 in "OOl" ; canaliculi inconspicuous, 9 in -001". Length 

 of F. -0025" to -0076". v.s. 



W. Sm. Ann. 2nd Ser. vol. v. p. 124. 



Fresh water. Lough Mourne Deposit, Cantyre Peat. 

 Plate I. 1. 



2. Epithemia turgida, TV. Sm. F. V. somewhat inflated ; V. slightly 

 arched, extremities suddenly attenuate, obtuse ; striae moniliform, 

 21 in -001"; canaliculi distinct, 12 in -001". Length -0026" to 

 •0062". v.v. 



JEpithemia Vertagus, Kiitz. Bacill. xxx. 5. sic. cl. De Bre'bisson in litt. cum 



specim. 

 Eunotia turgida, Ehr. Inf. tab. xiv. 5. xxi. 20 a. Quek. H. C. xii. 5. In 



Conjugation, Thw. Ann. vol. xx. pi. iv. Prit. Anim. xiv. 1-8. 

 Cymhella turgida, Hass. Alg. pi. c. 7. 



Fresh water. Near Aberdeen, Dr. Dickie. Wareham, Lewes, May 1850, 

 &c., W. Sm. Lough Mourne Deposit, Dolgelly Earth, Cantyre Peat and 

 Peterhead Deposit. 



Plate I. 2. Frustule with endochrome. Frontispiece, vol. i. fig. II. 



3. Epithemia granulata, Kiitz. F. V. linear ; V. slightly arched, 

 linear, otherwise like the last. Length -0033" to -0081". v.s. 



Kiitz. Bacill. v. 20. Eunotia granulata, Ehr. Inf. xxi. 20 /?. 

 Fresh water. Lough Mourne Deposit. 

 Plate I. 3. 



4. Epithemia Zebra, Kiltz. V. equally arched ; F. V. linear ; ex- 

 tremities of V. gradually attenuate; striae punctate, 33 in "OOl"; 

 canaliculi few, 8 in -001". Length -0016" to -0035". v.v. 



Kiitz. Bacill. v. 12. Eunotia Zebra, Ehr. Inf. xxi. 19. Cymbella Zebra, 

 Hass. Alg. c. 8. 



Fresh water. Wareham, Lewes, &c., Aug. 1850, W. Sm. 



Plate I. 4. 



5. Epithemia Argus, W. Sm. F. resembling the last ; foramina 

 conspicuous on the F. V. Length -0013" to -0021". v.v. 



Epithemia alpestris, Kiitz. Sp. Alg. p. 2. ad spec, authent. quae misit cl. De 

 Brebisson, Jan. 1853. Prit. Anim. xxiv. 11. 



Fresh water. Near Aberdeen, Dr. Dickie. 



Plate I. 5. 



