282 



The Diatom-Flora of Martin Beck., Yorks. 



832 Navicula alpina Ralfs (rare). 



833 t ^ ■ borealis Ehr. 

 835 t N. divergens Ralfs. 



837 N. Brebissonii Kutz. 



* N . stauroptera Grun. 

 *N. stauroptera var. parva. 



838 t A'. Tabellaria Kutz. 



839 N. gibba Kutz. 



840 N . bicapitata Lagerstedt. 



* N . subcapitata Greg. 



841 N. appendiculata Kutz. 



842 N. mesolepta Ehr. 



* N. mesolepta var. termes. 



843 A''. Legiimen Ehr. 



844 N . obloriga Kutz. 



849 N . radiosa Kutz. 



850 N. cryptocephala Kutz. 

 852 N . rhyncocephala Kutz. 

 854 A'^, humilis Donk. 



876 t N. pusilla Wm. Sm. 



882 Ai^. serians Kutz. 



887 N. Amphisboena Borg. 



889 t N. ventricosa Donk. 



890 N. Iridis Ehr. [V.H. 

 N. Iridis v. AmpJiigomphus 

 N. Iridis v. Amphirhynchus 



Dc Toni. 

 N . Iridis v. affinis V. H. 

 A^. Iridis v. proditcta V. H. 



* N. Americana 'Ehr . (very 



891 t -^^ Bacillum Ehr. [rare) 

 893 N . Pupula Kutz. 



897 Van Heurckia rhomboides 



Breb. 

 var. crassinervis V. H. 



898 F. H. vulgaris Thw. 



* Gomphonema constrictum 



var. ciirta Ehr. 

 910 G. acitminatuni Ehr. 

 G. acuminatum 



var. coronatuin. Ehr. 



914 ^ G. gracile Ehr. 



915 G. intricatum Kutz. 



G. intricatum v. vibrio V.H. 

 923 Adnanthidium flexellum 



Breb. 

 925 Achnanthes microcephala 



Kutz. 

 932 Cocconeis Placentula Ehr. 

 940 Eunotia A reus Ehr. 



941 



942 



945 



949 

 953 



956 

 958 



959 



* Eunotia A reus var. plicata 

 Br. and Herib. 



E. Arcus var. minor V. H. 



E. Arcus var. bidens. 



E. major Rabenh. 

 *E. major var. bidens Rabenh. 



E. gracilis Rabenh. 

 *E. pectinalis forma ciirta 



Rabenh. 

 *E. pechinalis forma elongata 

 Rabenh. 



E. Faba Grun. 

 *E. praerupta var. curta Ehr. 



E. robusta v. tetraodon V.H. 



E. lunaris Grun. 

 '[E. lunaris var. bilunaris. 

 *E. lunaris var. subarcuata. 



Synedra pulchella Kutz. 

 *S. pulchella forma major. 



S. Ulna. 

 *S. Ulna var. lanceolata. 

 t5. Ulna var. aequalis. 



S. Ulna var. subaequalis. 



S. Acus Grun. 

 964 \S. amphicephala Kutz. 



966 Fragilaria virescens Ralfs. 



967 *F. capucina var. 



acuminata Desmaz. 



968 *F. construens var. venter 



Grun. 



F. muiabilis (Wm. Sm.) 

 Grun. 



* F. undata Wm. Sm. 

 Diatoma elongatum Ag. 

 Tabellaria flocculosa Kutz. 

 Surirella biseriata Breb. 

 5. linearis Wm. Sm. 



987 t5. robusta Ehr. [V.H. 



5. robusta var. splendida 

 989 S. ovalis var. ovata V. H. 

 993 H antzschia amphioxys Grun. 

 1008 ^Nitzschia dissipata 



var. media Grun. 

 *A^. commiitata Grun. 

 loio A'^. vermicularis Grun. 

 1016 A'^. linearis Wm. Sm. 

 1019 A^. Palea Kutz. 

 1029 *Melosira distans Kutz. 

 1037 f Cvclotella Meneghiniana 



Kutz. 



970 



973 

 979 

 984 



15 



In the above list the numbers refer to West's records in 

 the Alga-Flora. A ' * ' indicates new Yorkshire records, and 

 a ' f ' new records for the South-west division. 



The most noteworthy finds are the following : — 



Navicula americana (Fig. 3). Van Heurck mentions this 



as very rare ; he gives two British records — -Ireland (O'Meara) 



and Loch Kinnord (Davidson). In Schmidt's Atlas 312/15 



his illustration of it is endorsed ' England.' There are several 



