PLANKTON OF THE GULF OF MAINE 
427 
F. September 15, 1915 — Continued. 
*Coscinodiscus concinnus dominant. 
Chsetoceras constrictum. 
Ch. decipiens. 
*Ch. diadema. 
*Coscinodiscus oculus-iridis. 
*C. asteromphalus. 
*Ditylium brightwellii. 
*Melosira crenulata. 
*Nitschia closterium. 
*Paralia sulcata. 
*Pleurosigma normanii. 
*Rhizosolenia setigera. 
*R. shrubsolei. 
*Skeletonema costatum. 
*Thalassiosira nordenskioldi. 
*Thalassiothrix longissima. 
G. October 9, 1915, station 10328: 
Diatoms moderately abundant. 
*Chsetoceras decipiens numerous. 
*Rhizosolenia setigera numerous. 
5. — Bay 
A. Petit Passage, Nova Scotia, June 10, 1915: 
Diatoms very abundant. 
*Chaetoceras contortum dominant. 
*Ch. decipiens dominant. 
*Ch. scolopendra dominant. 
*Rhizosolenia semispina dominant. 
*Actinoptychus undulatus S. 
Chsetoceras constrictum. 
*Ch. criophilum. 
*Ch. debile. 
*Ch. diadema. 
6. — Banks off W 
A. Near Seal Island, Nova Scotia, March 23, 
1920, station 20084: 
Diatoms scarce. 
*Actinoptychus undulatus dominant. 
*Biddulphia aurita dominant. 
*Coscinodiscus concinnus dominant. 
*C. asteromphalus dominant. 
Chsetoceras decipiens. 
*Paralia sulcata. 
*Pleurosigma stuxbergii. 
*Rhabdonema arcuatum. 
*Rhaphoneis surirella. 
*Rhizosolenia setigera. 
*R. semispina. 
Skeletonema costatum. 
*Thalassiosira gravida. 
*Thalassiothrix nitschioides. 
G. October 9, 1915 — Continued. 
*Thalassiosira decipiens numerous. 
*Thalassiothrix longissima numerous. 
*Actinoptychus undulatus. 
*Ch 2 etoceras breve. 
*Ch. didymum. 
*Ch. constrictum. 
Ch. danicum. 
Ch. debile. 
*Ch. difficile (with endocysts). 
*Ch. laciniosum. 
*Coscinodiscus concinnus. 
*C. excentricus. 
*C. asteromphalus. 
*C. oculus-iridis. 
Coscinosira poly chorda. 
*Ditylium brightwellii. 
*Paralia sulcata. 
*Rhabdonema arcuatum. 
*Rhizosolenia shrubsolei. 
*Thalassiosira hyalina. 
)F Fundy 
A. Nova Scotia, etc. — Continued. 
*Ch. laciniosum. 
*Ch. teres (with endocysts). 
*Corethron valdiviae. 
*Coscinodiscus concinnus. 
*Nitschia seriata. 
*Paralia sulcata S. 
*Rhabdonema arcuatum S. 
*Rhizosolenia alata. 
*Thalassiosira gravida. 
*Thalassiosira nordenskioldi. 
stern Nova Scotia 
B. South of Seal Island, Nova Scotia, April 15, 
1920, station 20104: 
Very abundant diatom plankton. 
*Chsetoceras contortum dominant. 
*Ch. debile dominant. 
*Ch. diadema dominant. 
*Actinoptychus undulatus S. 
*Biddulphia aurita. 
*Chsetoceras criophilum. 
*Ch. decipiens. 
*Ch. laciniosum (with endocysts). 
*Ch. seiracanthum. 
*Paralia sulcata. 
*Rhizosolenia semispina. 
*Thalassiosira gravida. 
Th. nordenskioldi. 
*Th. decipiens. 
*Thalassiothrix nitschioides. 
