Norman, on Diafomaceae. 
159 
P. Nubecula, Sm. — Rare. Timber Pond, Grimsby. Timber 
Ponds, Victoria Dock. 
P. delicatulum, Sm. — Not nnfrequent in salt and brackish 
water. Victoria Dock Timber Ponds. Ditch leading 
from Stoneferry to Sutton. 
P. strigosum, Sm. — Not nnfrequent in salt water. Humber 
Banks, near Paull. Dredgings, Flambro^ Head. Grimsby. 
Humber Banks, Marfleet. 
P. quadratum, Sm. — A small variety in abundance under the 
Railway arch. Dairy coats. 
P. angulatum, Sm. — Very frequent and abundant. Humber 
Banks. Garrison Moat. Dairycoats. Pure in many 
instances. Outlet Hornsea Meer. Stoneferry. Grimsby, 
very large. 
P. jEstuarii, Sm. ? — Plentiful in a gathering under the Rail- 
way arch, Dairycoates. North Humber Bank, Dr. 
Munroe. 
P. Normani, 'R3L\h=lanceolatum, Nor. — Abundant in Ascidian 
gatherings. 
P. lanceolatum, Donk. — Very rare. Sand at Hornsea. 
P. acutum, Nor. M. S. — Frequent in Ascidian gather- 
ings. 
P. Balticum, Sm. — Very rare. Humber Banks in two in- 
stances, but only in odd frustules. 
P. scalprum,BYeb.=Balticum Var.y Sm. — Prequent in salt 
and brackish water. Pure on a stone Jetty near Hessle. 
Grimsby. River Hull. Humber Banks. Garrison 
Moat. Ditch near River Hull, above Stoneferry. 
P. Strigilis, Sm. — Not nnfrequent in salt and brackish water. 
Pure, Humber Bank, near Marfleet Clough. Ditch near 
River Hull, beyond Stoneferry. Ditch running from 
Stoneferry to Sutton. 
P. acuminatum, Sm. — Not nnfrequent in salt water. Near 
Grimsby. Stallingbro'. Never abundant. 
P. distortum, Sm. — Not common. Salt or brackish water, 
near Grimsby. 
P. Fasciola, Sm. —Very frequent in brackish water. Humber 
Banks, very frequent and sometimes pure. Garrison 
Moat, pure. Grimsby, much larger than on the north 
side of the Humber. Ditch running from Stoneferry to 
Sutton, pm'e. 
P. macrum, Sm. — Very local. Copious in a brackish ditch 
running from Stoneferry to Sutton. 
P. prolongatum, Sm. — Pool at Grimsby, rare. Not nnfrequent 
in Ascidian gatherings. Victoria Dock Timber Pond, 
Mr. Robt. Harrison. 
P. transversale, Sm. — Rare. In Ascidians. 
