36 TRANSACTIONS AND PROCEEDINGS OF THE (Sess. nar. 
Genus GYRosIGMA, Hass. 
368. G. attenuatwm (Kiitz), Rabenh. S.—Plankton of Loch Asta. 
369. G. acuminata (Kitz), 0.—Moor pool near Stromness. 
370. G. Spencerti (Queck), O. K. O.—Near Kirkwall. 
Genus MASTOGLOIA, Thwaites. 
371. M. Smithii, Thwaites. O—Finstown. S.—Near Scalloway. 
Family GoMPHONEMACEZ. 
Genus GOMPHONEMA, Ag. 
372. G. acuminatum, Ehrenb. O.—Kirkwall; Stromness; near Fins- 
town; Hoy. S.—Near Lerwick ; Bressay. 
373. G. construtum, Elirenb. S.—Bressay. 
Var. capitatum (Ehrenb.), V. H. S.—Lerwick.. 
374. G. intricatum, Kiitz. O—Hoy. S.—Near Lerwick ; near Scallo- 
way ; Bressay. 
Var. Vibrio (Ehrenb.), V. H. 0.—Plankton of Loch Kirbister. 
375. G. olivaceum (Lyngb.), Kiitz. O.—Hoy. Piankton cf Loch Kir- 
bister. S.—Near Lerwick. 
Family CoccoNEMACE. 
Genus cocconEMA, Ehrenb. 
376. C. Ehrenbergti (Kitz), G. S. West. [Cymbella Ehrenbergu, Kiitz.] 
.—Hoy. §%.—Bressay, in ditches. 
377. C. cuspidatum, (Kiitz), G. S. West, [Cymbella cuspidata, Kiitz.] 
'  O,—Finstown ; Siromness; Hoy. S.—Scalloway. 
Var. naviculiformis (Auersw.) S.—Lerwick. 
378. C, delicatulum (Kutz), nob. [Cymbella delicatula, Kitz]. O.— 
Kirkwall ; Hoy, S.—Scalloway ; Bressay. 
379. C. affine (Kiitz), nob. [Cymbella affinis, Kiitz.] O—Plankton of 
Loch Kirbister. S.—Scalloway ; Bressay. 
380. C0. gastroides (Kiitz), nob. [Cymbella gastroides, Kiitz.] O.—Kairk- 
wall ; Hoy. 
381. C. lanceolatum, Ebrenb. 0.—W. of Kirkwall. Plankton of Loch 
Kirbister. 
382. C. cymbiforme, Ehrenb. 0.—Near Finstown; Stromness. S.— 
Lerwick. 
383. C. Cistula, Ehrenb. O.—Near Finstown ; Stromness; Hoy. S.— 
Lerwick. 
384. C. helveticum (Kiitz), nob. [Cymbella helvetica, Kiitz,] O.—Hoy. 
S.—Near Lerwick ; Bressay. 
385. C. tumidum, Bréb. O.—Finstown. 
386. C. ventricosum (Ag.), nob. [Cymbella ventricosa, Ag.| S.—Near 
Lerwick. 
387. C. obtuswm (Greg. ), nob. It Cymbella obtusa, Greg.] O.—Hoy. 
388. C. cespitosum (Kiitz.),G.S. West. [Encyonema cespitosum, Kiitz.] 
S.—Neugles Water. 
389. C. gracile (Rabenh.), G.S. West. [Encyonema gracile, Rabenh. | 
O.—W. of Kirkwall; Hoy. 
Genus AMPHORA, Ehrenb. 
390. A. ovalis, Kutz. O.—Near Kirkwall ; Finstown; Hoy. Plankton 
of Loch Kirbister. S—Near Lerwick; Neugles Water. 
Plankton of Lochs Asta and Clickhimin. 
