286 THE DIATOMS OF GUERNSEY. 



C. eeeentrieus. Moulin Huet. Petit Bot. Salerie. 



C. minOP (Ehr.J Not uncommon in scrapings and gatherings from low 

 water mark. 



C nitidus. Cobo. Perelle. Petit Bot. 



C. minor (Ruiz.) 



Actinoeyclus quinarius (Ehr.J 



A. Ralfsii. Common in most deep water gatherings. 



A. fulvus. Bordeaux, a single specimen. 



A. erassus. 



A. SUbtiliS. Petit Bot. 



A. tessellatus. 



Asterolampra flabellata. Mr. Rylands says that "This species has 

 occurred two or three times in different gatherings." 



Aetinoptyehus undulatus. Common. 



A. senarius. 



AuliSGUS SCUlptus. Petit Bot, one small specimen. 

 Biddulphia pulehella. Rather common. 



B. regina. "Occurs in three of the gatherings; ought to be sought for 



growing " (Rylands). 



B. aurita. 

 B. granulata. 



B. tUPgida. I have only seen a single specimen of this, from Cobo ; but 

 Mr. Rylands gives "Pond and beach at the Vale ; plentiful in the slides." 

 B. rhombus. 



B. Bai 1 eyi. Scattered specimens have occurred in nearly all my coast gather- 



ings. Dr. Wallich says "Taken with the skimming - net ; evidently a 

 floating species." 

 Isthmia enePViS. Occurs more or less commonly all round the coast. 



Tpieepatium apmatum. 



T. altepnans. 



T. Bpightwellii. 



T. stPiolatum. 



T. favus. 



AmphitetPas antediluviana. Generally distributed, especially common 



on the south coast ; the var. B. occasionally. 

 Chsetoeeros Wighami. " Taken by the skimming -net ; found in myriads 



at or near the surface ; day quite calm ' ' (Wallich) . 



RhlZOSOlenia Styliformis. Taken with the last species by Dr. Wallich. 



" A second species occurs in one of the sea surface skimmings — a very fine 

 form, but not in a condition to be identified " (Rylands). 



COGCOneiS diaphana. Rather common ; chiefly the var. B. of Smith. 



C. pedieulus. Pool by Fort Doyle. 



C. plaeentula. Occasional in roadside gatherings. 

 C. diPUpta. Not uncommon. 



C. tpansvepsalis. 



C. SCUtelium. Common. 



C. distans. Perelle Bay, one fine specimen. Also a single one in the peaty 



deposit from Cobo. 

 C. lampPOStieta. Petit Bot. Perelle Bay. 

 C. splendida. Cobo, two specimens. Perelle, one. 



