218 



E. Jergensen. 



Amphora Ehrb. 

 Amphora Cl. s. s.. Synops. Navic. Diat. II. p. 100. 



Valves with transverse rows of coarse puneta, forming longi- 

 tudinal lines, or strong transverse costse, crossed by longitudinal 

 ones. Connecting zone simple. 



A. proteiis Greg. 

 Gheg. Diat. of Clyde p. 518, pi. XIII. f. 81. A. Schm. Atlas, pi. 27, f. 3. 



Very variable. 



Frequent: Stamsund -f, Svolvser r. Raftsund r. Stene +, 

 Gaukvsero + c. 



Distribution : Coasts of the North Sea. Arctic regions. The 

 Mediterranean. Black Sea. The Atlantic. Indian and Pacific 

 Oceans. 



■var. contigiia Cl. 



Cl. 1. c. p. 103. A. Schm. Atlas, pi. 28, f. 4. 



Perhaps a separate species. 



Not unfrequent : Stamsund r. Svolvser r. the Ostnesfiord r. 

 Distribution (of veer, contigua Cn.): North Sea. The Adriatic. 

 Labuan. New Caledonia. 



A. robusta Greg. 

 Greg. Diat. of Clyde p. 519, pi. XIII, f. 79. 



Not unfrequent: Stamsund r. the Ostnesfiord +. 

 Distribution: Coasts of the North Sea. Spitsbergen. The 

 Mediterranean. Macassar Strait. Pacific Ocean. 



A. oralis Ivutz. 

 KCtz. Synops.. figs. 5 — 6. Van Heurck Synops. p. 59. pi. I. f. 1. 



Very rare: Stamsund, r. 



Distribution: Fresh or slightly brackish water. Frequent in 

 Northern and Western Europe. Arctic regions. 



b. Diplamphora Cl. 1. c. p. 107. 



Connecting zone complex, with more or less numerous longi- 

 tudinal divisions and transverse striae or cost*. Valves with trans- 

 verse eostse, or rows of puneta. on the dorsal side with one or two 

 longitudinal lines. 



A. crassa Greg. 



Greg. Micr. Journ. V. p. 72. pi. I, f. 35: Diatoms of Clyde p. 524, pi. XIV. 



f. !i4. A. Schm. Atlas pi. 39, f. 30. 



Rare : Stamsund r. Svolvser r, Stene r. 



Distribution: Coasts of the North Sea. Arctic regions. The 

 Mediterranean. Indian Ocean. China. 



Tar. solsTigieusis Petit. 

 Petit Diat. Cap Horn, p. 120, pi. X, f. 15, p.p. A. Schm. Atlas pi. 48, f. 17. 



Beautiful form. 



Very rare: Stamsund. r. Ill x 18 n; costse i 1 /* on 10 p., 

 lineate. Strong longitudinal line. The costa? answer to the fig. 18 

 in A. Schm. Atlas, the margin of the ventral side to fig. 17 (these 

 figures thus correspond to different focussing). 



A. Grxffii Grin. 

 Grun. in A. Schm. Atlas pi. 25, fig. 40. 



Very rare: Stamsund, r. 63 x 14 ;>.; stria? 17 on 10 <>-. crossed 

 on the dorsal side by a blank line. Ends little protracted. Axial 

 area a little constricted in the middle. 



Not unfrequent: Stamsund r -f • Stene -\-, Gaukvsero r. 



Distribution: Naples. Indian Ocean. Pacific Ocean. 



A. GreTilleaua Greg. 

 Greg. Micr. Journ. V, p. 73, pi. I. f. 36. Diat. of Clyde p. 522, pi. 13, f. 89. 

 A. Schm. Atlas pi. 25. f. 41. A. fasciata Greg. 1. c. pi. 13. f. 90 (cfr. Cl. 1. c). 



Rare: Stamsund r. Stene r. 



Distribution: Coasts of the North Sea and Western Europe. 

 Spitsbergen. The Mediterranean. Pacific Ocean. Central America. 



Breb. Diat. Cherb. f. 8. 



A. sulcata Breb. 

 Greg. Diat. of Clyde p. 523. pi. XIII, figs. 92, 92 b 

 Cl. 1. c. p. 112. 



Very rare: Stamsund r, the Ostnesfiord r. 15 stria? on 10 |i. 

 74 |jl long. Corresponds exactly to the figures and description 

 in Gregory 1. c. Also tolerably well answering to Cleve's species. 



Distribution: West coast of Europe. Balearic Islands. 



A. Miilleri A. Schm. 



A. Schm. Atlas pi. 2ii. E. 31. .1. monilifera Greg.? Diat. of Clyde, p. 511. 



pi. XII, f. 69. 



Very rare: Stamsund. r. Valve 73 x 11 n, with 7 1 ■■ stria- 

 on 10 ;>.. obtuse. The ventral side as illustrated by A. Schm., 

 rather narrow, towards the ends broader, then again narrowing. 

 The raphe is not so distinctly bent as in the figure. On the 

 broader part of the ventral side, inside the marginal stria?, there 

 is a band of short stria 3 , as in .4. proteus, separated from the 

 marginal stria' by a blank line. Dorsal stria?, as in the figure 

 mentioned, crossed by a broad blank, longitudinal line. Another 

 sharp line is seen close to the dorsal margin. 



Distribution: West coast of Norway (Hvidingso). 



A. alata Perag. 

 Perag. Diat. de Villefr. p. 41. pi. II. f. 11. Van Heurck Trait e d. Diat. 



pi. 24. f. 677. 



Very rare: Stamsund, r. 



Distribution: West coast of Norway. Morocco. The Medi- 

 terranean. Macassar Straits. America. 



A. binodis Greg. 

 Greg. Diat. of Clyde p. 510. pi. XII. f. 67. Cl. 1. c. p. 124. 



Very rare: Stamsund. r. 34 \<- long. Completely answering 

 to the illustration in Greg. 1. c 



Distribution: Scotland. Balearic Islands. 



c. Halamphora Cl. 1. c. p. 117. 



Connecting zone complex. Raphe close to the ventral margin. 

 Transverse, punctate striae, not crossed by any longitudinal line. 

 Ends of the valve usually rostrate or capitate. 



