
MARINE DIATOMACE OF THE U.M.B.C. DISTRICT. 121 
Biddulphia (Gray) aurita, Breb. Connah’s Quay, common. 
. baileyi, W. Sm. Surface of Dee, very common. 
. granulata, Roper. Surface of Dee, rare. 
. obtusa, Kutz. Connah’s Quay, rare. 
. radiatus, Greg. Parkgate, rare. 
. rhombus, W. Sm. Parkgate, common. 
. suborbicularis, Grun. Surface of Dee, rare. 
. turgida, W. Sm. Parkgate, rare. 
The form B. aurita is not so common on this coast as 
about the Thames and south coast, where it is found 
abundantly associated with Actinoptychus splendens and 
Eupodiscus argus. 
les) lee) Tes} les) lee} tee} leo 
Canwpylodiscus (Khr.) bicostatus, W.Sm. Mostyn, rare. 
C. cribrosus, W. Sm. Mostyn, rare. 
Cestodiscus (Grev.) gohnsomanum, Greg. Mostyn, rare. 
Chetoceros (Ehr.) armatum, West. Surface of Dee, rare. 
C. boreale, Bail. Connah’s Quay, rare. 
C. paradoxum, Cleve. Surface of Dee. 
C. wighamu, Brightw. Surface of Dee, rare. 
Cocconeis (Khr.) scutellum, EKhr. Hilbre Island, common. 
C. britannca, Negeli. Isle of Man, common. 
C. eccentrica, Dn. New Brighton sands, Comber. 
Coscinodiscus (Ehr.) asteromphalus, Grun. Surface of 
Dee, common. 
C. concinnus, W. Sm. Parkgate, common. 
C. eccentricus, Ehr. Parkgate, common. 
C. fimbriatus, Ehr. Surface of Dee, rare. 
C. obscurus, Schmidt. Surface of Dee, rare. 
C. radiatus, Hhr. Connah’s Quay,-rare. 
Cymbella (Ag.) scotica, W. Sm. Mostyn, rare. 
Dickeia (Berk.) ulvoides, Berk. Colwyn Bay, rare.- 
