[bailey-mackay] diatoms FROM VANCOUVER ISLAND, B. C. 161 



indicating that there are six rows of pearls to 10 microns at the centre 

 varying to four at the outer rim. 



Where there is a distinction between the upper and lower valves 

 it can be indicated by prefixing "u" or "1" before the "v"; and so 

 forth- 



ALPHABETICAL LIST OF THE VANCOUVER DIATOMACEAE. 



A chnanthes brevipes Ag. Iv50(9)s8, v67(17), v75. 



« " var. minor Perag. v26(ll)s8, z30(4)sl0. 



" exilis Ktz. Kendal. 



« longipes Ag. z52(7)s6, uvl04(23:20:23)s8:5. 



" " var. v67(31)s3:8, Valve oval, 25 lateral ribs on 



each side about 3 apart, four rows of dots between 

 the central ribs, and two between the others, 

 8 to 10 dots in 10 microns. From Departure 

 Bay. 

 " Lorenziana Grun. v40(17)s8. One specimen, on algae. 



" minutissima Ehr. v23(3 + )sl2, v30(3.5)sl2. 



« parvula Ktz. vl8(5)sl5, v30(10)sl6. 



« siihsessilis Ktz. v45(9)sll. v60(10:8:10)s9. 



Achnanthidium lanceolatum Bréb. z22(3)sl2, z35(5) sll. 

 Actinocyclus suhtilis Ehr. v35. 

 Actinoptychus socius A. S. n.v. v24, ten-rayed. 

 " undulatus Ehr. v22, v75, Common. 



" " var. y3)2), ten-rayed. 



" " var. Three of the alternate segments marked 



by a circular dot. 

 Amphiprora alata Ktz. 



" lepidoptera Greg. 120(20). 



" " var. proboscidea C1.75s20, 105(16). 



" maxima Greg. var. gracilis Grun. 192(36)sl8. 



" sulcata O'Meara, 110(25 :10:25)s8. 



Amphitetras antediluviana Ehr. n.sp. ? Has large areolation. Resem- 

 " bles (but is not identical with) 



quadrangular forms of Triceratium 

 faviis. 

 Amphora angusta Greg. var. ? 25 ( ?)s9, 40(5)s8, 41(7)s8-f . 

 " " var. oblongella Grun. v45(8)sl5, v68(10)sl5. 



" arenicola Grun. z45(22)slO, z53(20)sl2. 



" n.sp. v73(6)sl5, Like A. graefii CI., except that the striae 



stop short of a radiant area opposite the central 

 nodule, and the ends have a downward turn below the 

 line passing through the central nodule. 



