88 Proceedings 



of the Royal Irish Academy. 











L. Neagh. — Number of organism.^ in the total catch (VertimI Haul) of 



1 



Feb. 23. 



Mar. 5. 



Mar. 17. 



Mar. 30. 



April 13. 



April 27. 



May 11. 



May 2o 



Asterionella gracillima, 



42,00C 



82,500 



119,500 



173,500 



299,000 



451,000 



715,500 



2,062,0G 



Fragilaria crotonensis, 



2.38,000 



609,500 



819,000 



501,300 



575,500 



415,500 



271,500 



123,000 



1 Synedra revaliensis, . . 



-- 



- 



- 



- 



- 



- 



- 



- 



Synedrn sp., . , 



- 



- 



- 



- 



- • 



— 



1,500 



~ 1 



Amphipleura, 



500 



- 



- 



- 



- 



- 



1,500 



- 



Epithemia 



- 



1,500 



6,000 



4,500 



- 



2,100 



- 



- 



Cymatopleura elliptica, 



40,500 



119,500 



162,000 



63,000 



44,000 



84,800 



30,000 



25,500 



Cymatopleura solea, , . 



- 



- 



- 



- 



3,000 



600 



1,500 



1,500 



Tabellaria fenestrata, 

 far. aeterionelloides. 



82,000 



327,000 



375,000 



428,000 



530,000 



624,500 



391,500 



541,500 



Surirella, 



13,500 



18,000 



24,000 



12,000 



35,000 



29,900 



10,500 



24,000 



Melosira sp., . . 



(only bottom-surf, catch.) 



Stephanodiscus astrea , 



18,600,000 



9,060,000 



(Not CO 



unted) 



4,400,000 



(Not 

 counted) 



800,000 



(Not 

 counted) 



64,500 







19,000 



44,000 



25,000 



41,000 



103,500 



42,000 



Coseinodiscus lacustris, 



258,000 



1,271,000 



1,540,000 



909,000 



631,500 



1,481,000 



478,500 



260,200. 



Pleurosigma sp 



3,000 



9,000 



15,000 



2,500 



7,000 



9.000 



1,500 



3,000 



Closterium, 



- 



9,000 



21,300 



12,000 



5,000 



10,600 



13,500 



3,000 



Cosmarium, 



- 



- 



- 



- 



2,-500 



5,225 



1,500 



3,000 



Stauiastrum sp., 





13,500 



19,500 



12,000 



5,000 



9,600 



1,500 



4,500 



Pediastrum boryanum, 



30,000 



31,500 



36,000 



8,500 



13,000 



37,200 



20,500 



15,000i 



, , duplex, . . 



12,000 



32,500 



27,000 



10,500 



18,000 



31,100 



24,200 



6,000; 



Kirchniriella obesa . . 

 (bottom-surf, only.) 



Sphaerocystis schroteri, 

 (bottom-Eurf. only.) 



- 



1,000 

 1,000 



(Not CO 



unted) 



39,000 



(Not 

 counted) 



121,000 



(Not 

 counted; 



Dictyosphaerium pulchellum, 



13,000 



3,000 



- 



- 



3,000 



- 



- 



- 



Scenedesmus, . . 



- 



- 



3,000 



3,000 



8,000 



11,600 



11,000 



3,000 



Eudorina, 



- 



— 



- 



- 



- 



— 



— 



- 



Tribonema, 



(bottom-Burf. catch only.) 



400,000 



950,000 



(Not CO 



unted) 



300,000 



(Not 

 counted) 



100,000 



(Not : 

 counted] 





















