424 



BULLETIN OF THE BUREAU OF FISHERIES 



D. Off Gloucester, March 1, 1920 — Continued. 



*Cha>toceras atlanticum. 

 *Ch. constrictum. 

 *Ch. criophilum. 



Ch. debile. 



Ch. diadema. 

 *Ch. didymum. 

 *Coscinodiscus concinnus. 

 *C. curvulatus. 

 ♦Lauderia glacialis. 

 *Nitschia seriata. 



E. Off Gloucester, April 9, 1920, station 20090 : s ° 



Diatoms very abundant. 

 *Cli£etoceras debile dominant. 

 *Thalassiosira nordenskioldi dominant. 

 *Cha?toceras contortum abundant. 

 *Ch. decipiens abundant. 

 *Ch. furcellatum abundant. 



*Biddulphia aurita. 

 *Cha?toceras atlanticum S. 

 *Ch. criophilum. 

 *Ch. densum. 

 *Ch. diadema. 

 *Ch. scolopendra. 

 *Ch. willei. 



♦Coscinodiscus asteromphalus. 

 *Fragilaria cylindrus. 

 *Navicula sp. (?) S. 

 *Rhizosolenia semispina. 

 R. setigera. 



B. Off Gloucester, April 9, 1920 — Continued. 

 *R. styliformis. 

 *Thalassiosira gravida. 

 *Thalassiothrix nitschioides. 



F. August 24, 1922, station 10635: 



Diatoms moderately abundant. 



Skeletonema costatum dominant. 



Rhizosolenia alata. 



(Skeletonema costatum and Rhizo- 

 solenia alata together constituted 

 nearly 100 per cent of the diatoms.) 



Chretoeeras decipiens S. 

 Chsetoeeras sp. (?) S. 



G. August 24, 1922, station 10640: 



Diatoms moderately abundant; many 



Ceratium. 

 Rhizosolenia alata nearly 100 per cent 



of the diatoms. 



Skeletonema costatum. 

 H. October 1, 1915, station 10323 (near Cape 

 Cod): 



Diatoms in medium abundance. 

 ♦Skeletonema costatum nearly 100 per 

 cent of the diatoms. 



*ChaHoceras decipiens S. 

 *Coscinodiscus sp. (?) S. 

 ♦Rhizosolenia shrubsolei S. 



2. — Neighborhood of the Isles of Shoals 



A. March 4 and 5, 1920, stations 20060 and 

 20061 combined: 



Diatoms very abundant. 

 *Cha;toceras contortum dominant. 

 *Ch. diadema dominant. 

 *Thallassiosira gravida dominant. 

 *Th. nordenskioldi dominant. 



♦Biddulphia aurita. 



*Cha;toceras atlanticum. 



*Ch. criophilum. 



*Ch. debile. 



*Ch. decipiens. 



*Ch. didymum. 



*Ch. laciniosum. 



*Ch. sociale. 



*Ch. teres. 



*Coscinodiscus asteromphalus. 



-Continued. 



March 4 and 5, 1920- 

 *C. concinnus. 

 *C. curvulatus. 

 *C. excentricus. 

 *C. radiatus. 

 *C. subtilis. 

 ♦Detonula cystifera. 

 *Ditylium brightwellii. 

 *Lauderia glacialis. 

 *Melosira borreri S. 

 *Nitschia seriata. 

 *Pleurosigma stuxbergii. 

 * Rhizosolenia semispina. 

 *R. setigera. 



*Stephanodiscus astrea S. 

 ♦Skeletonema costatum. 

 *Thalassiosira baltica. 

 *Thalassiothrix nitschioides S. 



s° The list of diatoms for a haul in the inner part of the bay on Apr. 6, 1920 (station 20089) is the same except that it includes 

 •Ckaetoceras laciniosum,' Ch. sociale, and * Ch. teres, likewise Rhizosolenia setigera and 'Thalassiosira subtilis, but lacks Ch. furcellatum, 

 Coscinodiscus, Fragilaria, and Rhizosolenia styliformis. 



