38 DIATOMACEX. 
Famitry XVIII.—NAVICULEA—con. 
No. ‘ Name. Locatity. OccURRENCE. 
NavicuLa—con. 
6 oblonga, Kutz....... Canal, Chester .........- Sept. ’71..... r 
| 17 ovalis, Dn. .... +00. Cwm Bychan deposit....| ...++.- scss¥i eC 
14 palpebralis, Breb. ..| Connah’s Quay.......... May ’72...... ¢e 
5 pereprina, Dn. ./21+ |) Mostyn oi cy vce aets.'e stele Saby) Wile. cou 
|= 2 producta, 7. sp. ....| Flookersbrook ......... a |S May ofl... ee 
| 14 pusilla, Sm........- Connah’s Quay.......... May ’72....ve 
| 5 pygmea, Kedtz...,...] Mostyn ......scceeseeee July ’71....ve 
) 64 radians, Sm. ...0+s Rhydymwyn ......+..0.- May Y 72 os. r 
17 radiosa, Sm. ....«- Cwm Bychan deposit ....| ..-sseeeeee ve 
30 rectangulata, Greg..| Colwyn ....+...eeee00:- July ’74....v4r 
17 rhomboides, Ehr. ..| Cwm Bychan deposit...) ...++.seesee. r 
20 rostrata, Ehr....... MONEY Gera tele ts sees es July ’72....vr 
3 rhynchocephala,Kutz) Queen’s Park ..........- May ’71....ve 
15 semiplena, Greg....| Connah’s Quay .........| May ’72....v1r 
46 spherophora, Kutz..| Railway Station........ SNOW TL cas Wie 
44 staureiformis, Sm...) Canal, Chester......... A NGViItT. ose r 
5 suborbicularis, Greg.| Mostyn .........e+eeeees aly = TL eee 
11 subsalina, Dr ,..... Helsby Marsh .........- March ’72..ve 
7 varians, Greg.......| Queen’s Ferry .......... Weest7l sswses r 
48 venata, Kutz. ...... COP ace resort ose canes March ’72....¢ 
1 witidis, AMs.(< cove 5% Heron Bridge ..... Rts April ’71...v¢ 
(i Weatil, 2. sp. ...06. Queen’s Ferry.........:- Dec. ’71....We 
In this large genus Navicula I have attempted no arrange- 
ment, but have placed the species in alphabetical order. I have 
included the genus Pinnularia, as in their general form and 
growth they resemble the Navicule; and it is only in their 
markings that a difference is perceptible. 
I have obtained considerable help in the identification of 
species from the three parts published of Dr. Donxins’ 
“Natural History of British Diatomacex,” and which treated 
of the genus Navicula. 
Stavuroneis, Eh. 
7 ACUias NASD peas at 2 Queen’s Ferry .......... Dec. ’71....V ¥ 
2 anceps, Ehr. ...... Flookersbrook........... May ’71....ve 
1l crucicula, 7. sp.....| Helsby Marsh........... March ’72..vc¢ 
7 | — gracilis, Hhr. ...... Queen’s Ferry ........6 Deci’71.. ..v'e 
1 phenicenteron, Ef.) Heron Bridge ........... April ’71....¢ 
24 punctata, Kwtz...... Combermere.......5.s00¢ March ’73..vr 
18 pulchella, 7. sp..... IRArK Cab ey se jatoa as eect eet DUNES Ean nV E 
| 14 salina, 2. 8p. ....+. Connah’s Quay ........-- May ’72......F 
PrievRosiema, Sm. : 
42 acuminatum, Sm...| Bangor......... Seleiacte jen|| CUP 0 eos 
