426 



BULLETIN OF THE BUREAU OF FISHERIES 



C. May 13, 1915, station 10277: 63 

 Diatoms very abundant. 

 Thalassiosira nordenskioldi dominant. 

 Thalassiothrix longissima abundant. 



ChaHoceras contortum. 

 Ch. debile. 

 Ch. decipiens. 

 Ch. didymum. 



C. May 13, 1915— Continued. 

 Ch. laciniosum. 

 Coscinosira polychorda. 

 Ditylium brightwellii. 

 Lauderia glacialis. 

 Rhizosolenia semispina. 

 R. setigera. 

 Thalassiosira gravida. 

 Thalassiothrix nitschioides. 



4. — Near Modnt Desert Island 



A. March 3, 1920, station 20056: 54 

 Diatoms scarce. 

 Lauderia glacialis dominant. 

 Coscinodiscus sp.? 



Chretoceras decipiens. 

 Ch. didymum. 

 Ch. atlanticum. 



B. May 11, 1915, station 10275: 



Diatoms very abundant. 

 *Thalassiosira nordenskioldi nearly 100 

 per cent of the catch. 



*Biddulphia aurita. 

 Choetoceras debile. 

 *Ch. decipiens. 

 *Ch. diadema. 

 *Rhizosolenia setigera. 

 *Thalassiosira gravida. 

 (A scattering of each.) 



C. June 11, 1915, station 10285: 



Diatoms abundant. 

 *Thalassiosira nordenskioldi dominant. 

 ♦Cluetoceras contortum dominant. 

 *Ch. debile dominant. 



Chsetoceras constrictum. 



Ch. decipiens. 

 *Ch. furcellatum. 

 *Ch. laciniosum. 

 *Ch. scolopendra S. 

 *Ch. teres. 



Ch. sp.?. 

 ♦Coscinodiscus concinnus. 



Coscinosira polychorda. 



Lauderia glacialis. 

 *Rhizosolenia semispina. 

 *R. setigera. 

 ♦Thalassiosira gravida. 



" Not examined by Doctor Mann. 

 61 Not examined by Doctor Mann. 

 " On Aug. 21, 1912, Aslerionella japonica was nearly 100 per 



D. July 19, 1915, station 10302: 



Diatoms in medium abundance. 

 ♦Thalassiosira gravida dominant. 

 ♦Chsetoceras scolopendra abundant. 

 ♦Rhizosolenia setigera abundant. 



♦Chaetoceras contortum. 



Ch. debile. 

 *Ch. decipiens. 



♦Coscinodiscus asteromphalus. 

 ♦Nitschia seriata. 

 ♦Rhizosolenia alata. 

 ♦Thalassiosira decipiens. 

 ♦Thalassiothrix nitschioides. 



E. August 14, 1914, at a locality off the mouth of 



Penobscot Bay, station 10250: 



Diatoms abundant, with many Cera- 

 tium. 

 ♦Chsetoceras criophilum dominant. 



Ch. constrictum dominant. 

 ♦Ch. decipiens dominant. 

 ♦Ch. diadema dominant. 

 ♦Ch. scolopendra dominant. 



♦Chsetoceras debile. 

 ♦Ch. densum. 

 ♦Ch. laciniosum. 

 *Ch. peruvianum. 

 ♦Corethron valdiviae. 

 ♦Licmophora jurgensii. 

 ♦Nitschia seriata. 

 ♦Rhabdonema arcuatum S. 

 ♦Rhizosolenia setigera. 

 ♦Skeletonema costatum. 

 ♦Thalassiosira gravida. 

 ♦Th. nordenskioldi. 



F. September 15, 1915, station 10317: ° 5 



Diatoms in medium abundance. 

 ♦Thalassiosira gravida dominant. 



cent otthe very abundant phytoplankton in this region (p. 431). 



