104 



On the Microscopic Forms of the 



berg's garwiQ AulisGus, three of wliicli are also found at Charles- 

 ton, though Bailey failed to detect tlieni. Bailey's list is as 

 follows : 



Actiniscus sirius?, Ehr. 

 Actinocyclus bioctonarius, Ehr. 

 Actinoptychns senarius, Ehr. 

 Biddulphia piilchella, Gray. 

 Cocconeis scutellum, Ehr. 

 Coscinodiscus excentricus, Ehr. 

 Dictyocha fibula, Ehr. 

 Eupodiscus Rogersii, Ehr. 



" radiatus, B. 



Gallionella sulcata, Ehr. 



Navicula sigma, Ehr. 

 Pinnularia interrupta, K. 



" didyma, Ehr. 



" lyra, Ehr. 



Raphoneis rhombus, Ehr. 

 Stauroptera aspera, Ehr. 

 Surirella circumstuta, B. 

 Terpsinoe musica, Ehr. 

 Triceratium fovus, Ehr. 



" alternans, B. 



Certain of these have been renamed by later observers, or 

 have been found to be synonymous with already described 

 species, and should be designated thus : 



Actinocyclus bioctonarius, Ehr. 

 Actinoptychns senarius, Ehr. 

 Eupodiscus Rogersii, Ehr. 

 Pinnularia didyma, Ehr. 



" _ lyra, Ehr. 

 Raphoneis rhombus, Ehr. 

 Stauroptera aspera, Ehr. 

 Surirella circumstuta, B. 

 Gallionella sulcata, Ehr. 



= Coscinodiscus actinoptychns, Ed. 



z=z Actinophoenia splendcns. Shad. 



= Eupodiscus argns, Ehr. 



= Navicula didyma, K. 



lyra, K. 



= Doryphora amphiceros, K. 



= Stanroneis pulchella, W. S. 



= Tryblionella scutellum, W. S. 



= Orthosina marina, AV. S. 



Actiniscus siriiis^^hr.^ and Dictyocha fihula^ Ehr , are neither 

 of them Diatoms, but most probably portions of the skeleton 

 of a Ilolotliurian. 



About "two years since I received from a friend residing at 

 Charleston some of the, so-called, black "pluff mud," taken 

 from between water marks, and which I found to be extremely 

 rich in Diatomaceous forms. The following species were 

 observed : — 



