e/ 
DIATOMACEZ, 
Famity XVIII.—NAVICULEA—con. 
59 
No, Name. Locatiry. OccuRRENCE. 
PLEUROSIGMA—con. 
angulatum, Sm...... Monty ialeresis'siejso a iuicreta kc July ’71....¥¢ 
6 attenuatum, Sm. ..| Canal, Chester .......... Sept. ’71...ve 
16 balticum, Sm...... Connah’s Quay.......... May ’72....v¢ 
54 delicatulum, Sm, ..| Helsby Marsh........... March ’75....c 
15 distortum, Sm. ....| Connah’s Quay.......... May 72" sec c 
65 elongatum, Sm ....| Mostyn ..........ss00: SiG egy ee ¢e 
5 fasciola, Sm. ...... Fa einen embine ate catehbies sae SELON RM 
42 TOTINGEUMS, Me % 0.05] BANGOL .cccces sae serene Aug. ’74 ...vr 
14 hippocampus, Sm ..| Connah’s Quay ......... May ’72....vc¢ 
2 lacustre, Sm. ...... Flookersbrook .......... May’71....ve 
6 littorale, Sm ...... WVEGHEY TU 20) cattiaie’ orm aie hate iabeie UMULY) aL ee r 
41 marinum, Sm...... EGY Sieroitin sisiete aiote\s alate a: ate' July ’73...,vr 
43 prolongatum, Sm. ..| Mostyn..............005 duly iping a. e 
14 obscurum, Sm. ....| Connah’s Quay.......... ia aay 6 Se ay 
7 scalprum, Sm...... Queen’s Ferry .......... Dec. ’71 vr 
9 Spencerii, Sm...... TRG ESE ANE frayn at caresses rele March ’72..vc 
42 iLO SI oicha'ois)a} DOAN ROR scs/e ais slew s.scie ala Boe. 04s a r 
31 strigosum, Sm. RTOS EY TM eters sare ere ele ake seat ste July ’74....v1 
30 tenuissimum, 7. sp...| Colwyn ........ceseeees July °74 ..... ty 
ToxonipiA, Dn. 
34 Gregoriana, Dn. Connah's Quay.......... May 718.05... re 
36 | insignis, Dn. .. Estuary of Dee.......... July ’75....vr 
These last two forms I have never found abundant about 
Chester; only a few valves of Gregoriana on the tidal mud; 
and insignis I have only taken in the tow-net on the Estuary of 
the Dee. 
30 
Ampuiprora, Ehr. | 
alata, Kutz ...... Be SNL OSEY II ain". dihieisie/slasieis eine July ’71....ve¢ 
ittoralis . arcasut be EMINGL voperarnieisvare crea careers atts July °73....vr 
puludosa, 9257.05 See |LOBEY I tory civ ce vo qe bie oie Sul ye Pree. ¢c 
WItred, 3.80. wascak Hoylake....... nbgraae were July ’77,..V 1 
plicata, m. sp. ...... Li Geen oeneaae A eR July ’73....v1r 
pusilla,in. ap. soe pisPIBADGOP « psicicecss nas wiceies | Ang. ’74.,..vr 
SUB-FAMILY.—SCHIZONEMA. 
Mastocroia, Thw. | 
Smithii, Thw....... IL OSE VM rainale's'ciave’ncstole eierd, are LTB aia (i eA r 
lanceolata, Thw..... Puddington Marsh ...... June ’75..... r | 
Dicker, Berk § Ralfs : 
ulvoides, Berk. ..... UW YT cera s:s:sicle'sieareighe:« July ’74 
