THE DIATOMS OF CANADA , 119 



3. Diatoms from Drinking Water of the City of Montreal. — Continued. 

 Eunotia monodon E. v 106 (10:9:12:9:10). 



" pectinalis Rab. v 85 and E. formica E. vl04 (10 :8 :9 :8 :10) S8. 

 Frustulia rhomhoides, var. ampMpleuroides Gruii. One species, v 112 (8:20:8) Soo. 

 Fragillaria virescens Ralf. (v38 "yse) s O, v29 (^0/15) 3 17, v53 (?). 

 Gomphonema arcticum Griin v64 (6:23:11) s 9, v75 ( ) s 10; or 

 Gomphoneis herculanea (E) CI. Also another sp. z24 (3:6) and z 64 (8:24:10). 

 Hantzschia ejongata Griin. v200 ( ) One sp. 

 Amphioxys (see Nitschia). 



Melosira arenaria Moore. v50 (^%) s 13. Rare. 

 " crenulaia Ktz. vll (^%). Common. 

 " distans Ktz. or granulata vlO ( ) and M. vanans. 

 Meridian circulars Ag. v56, v70 ( ). 



Navicula appendiculata Ktz.? v 75 (7:12:7) or i\^. parva E. 

 '•' hacilliformis Griin. One specimen. 

 " cryptocephala Ktz. ? v 90 (5 :22 :5) s 8. 

 " major Gruu. v 224 (32 :31 :35 :31 :32) s 6+. 

 . " nohilis E. v 225 (36:35:37:35:36) s 6. 

 " rostellata ILtz. V 75 ( :15: ). 



" stauroptera Griin. var. parva E. ? or N. appendiculata. 

 viridis Ktz. vl70 (25) s 7. 

 Nitzschia amphioxys W. Sm.=^Ha7itzschia amphioxys (E.) Briin. One sp 70/a long. 

 hungarica Grun. v300 (10) s 6 and 00 

 " sigma Sm. var? common, 105/^, 224/x. 



Sigmoides (E). W. Sm. common, v280 (II) s4+, v340 (13) s7-5. 

 spectahilis (E) Ralfs, rare v320 ( :18:) sl2 and 4. 

 " vermicularis (Ktz.), Griin. Common, v240 (3:7:3) sl2 and °°, v224 (12) 17. 



Pleurosigma acuminatum (Ktz.) Griin, vl50 (37) ?, vl72 ( ), v 200 (20) ? 



" attenuatum, W. Sm. more common, vl50 (30) s9. 



Stauroneis acuta, W. Sm.one specimen v336 (61)^^=v336 (61) sll. 

 Schizonema (Navicula) rat7iosissimuvi C. Ag. v50 (10)^". 



Stephanodiscus Niagarce E. most common and distinctive species on the slide. Diam. 

 varying from 30;u„ ^Op., 60fi, 65fi, 70/x, 74/^, SOfi to 90;u, smaller forms look like 

 foreign sp. (Europe, Asia), like varieties of St. astraea (E) Griin, but they must 

 be all one species, 60 to 70 fx. being the more common size. 

 Surirella liseriata Breb. vll2 (36) sl-5. Not common. 

 " elegans E. vl90 (50) sl-6. 

 " Guatemalensis'. E. Microg. or cardinaUs Kitton. One sp. vl36 (65:50) sS. 



Might be S. elegans, with a hinge-like defect. 

 " gracilis Grun. var? vl36 (18) s3 vl36 (18)^ 

 " recedens A. S. One specimen v64 (30)". 

 rohusta E. v270 (55) •« v208 (56)^ -^ 

 splendida v220 (65)\ v74 (20)- -^ 

 Synedra acus (Ktz), common, v82 (4:6:4)^^. 



" capitata E. one good sp. v325 (10:7:10)^ 

 " \delicatissima var. angustissima Griin. 400 (3:5:3)^+. 

 " |v 500 (3:4:3)^, common in uncleaned material. 

 " ulna E. var ? common. v225 (3 :2 :5 :2 :3 :). 

 Tahellaria fenestrata Ktz. common. 70 and 94 ^. 

 " floculosa Ktz. rarer 10;u. 



4. Diatoms from streams, Tichborne, Ontario, November, 1918. 

 Collected hy H. C. Wheeler, Montreal. 

 Amphiprora ornata Bail. 100 microns long. 

 Amphora ovalis Ktz. v30 (8) sl4. 

 Cocconeis pediculus E. v20 (11). 



