486 CLEYE, DIATOMS. 



17. Isthmieae. 



Isthmia enervis Ehb. (W. Sin. Syn-. II, pag. 52, PI. XLVII) 

 Finm. 



I nervosa Kutz. (W. Sm. Syn. II, pag. 52, PI. XLVII) Bee- 

 ren Id, Iceland, Finm., Spitsb. 



f8. Eucampies. 



Eucampia Payeri Grun. Mpt. — F. J. L. 



19. Rhizosolenieae. 



BhisosoUnia styliformis Btw (Van Heurck Syn. PL LXXVIII, 

 fig. 1 — 5) Greenl. (Davis Strait), Northern Atlantic Ocean, 

 Finm., Kara. 



B. setigera Btw. (Van Heurck Syn. PI. LXXVIII, fig. 6—8) 

 Northern Atlantic Ocean, Cape Wankarema. 



~B. alata Btw. (M. J. VI, pag. 95, PI. V, fig. 8) Greenl. 

 (Tindingen), Northern Atlantic. 



B. ShrubsoUi CI. (Van Heurck Syn. PI. LXXIX fig. 11-13) 

 Northern Atlantic. 



B. hebeta Bail (Brightw. M. J. VI, PI. V, fig. 4) Cape Wan- 

 karema. F. J. L., Behring Sea. 



The only figure given of this species is very imperfect, for 

 which reason I have given another. PI. 38, fig. 69. — Length 

 of frustle 0,5 Breadth 0,o3 mm. Striae punctate, 25 in 0,oi on 

 the connecting membrane, crossing each other in three direc- 

 tions. 



Pyxilla? haltica Grun. (A. Schm. N. Sea. Diat. PI. Ill, fig. 25. 

 Van Heurck Syn. PI. LXXXIH, fig. 1—2) Cape Wankarema. 



Pyxilla? variabilis Grun. (Van Heurck Syn. LXXXIH, fig. 

 3—4) » Arctic Ocean». 



20. Chsetocereae. 



Chcetoceros decipims CI. (D. of the A. Sea pag. 11, PI. I, fig. 5) 

 Greenl. (Davis Strait, Tindingen) Northern Atlantic. 



var. concreta Grun. (A. Diat. pag. 120) together with the 

 genuine form. 



