428 
BULLETIN OF THE BUREAU OF FISHERIES 
C. Near Lurcher Shoal, April 12, 1920, station 
20101 (fig. 120): 
Diatoms moderately abundant. 
*Chaetoceras atlanticum dominant. 
*Ch. criophilum dominant. 
*Ch. decipiens dominant. 
*Ch. laciniosum dominant. 
Chsetoceras debile. 
Ch. diadema. 
*Ch. seiracanthum. 
*Ch. scolopendra. 
*Ch. sociale S. 
*Coscinodiscus radiatus. 
Lauderia glacialis. 
*Rhizosolenia semispina. 
*Thalassiosira decipiens. 
Th. gravida. 
*Tb. hyalina. 
*Thalassiothrix nitschioides. 
Th. longissima S. 
D. German Bank, April 15, 1920, station 
20103. 68 
Diatoms very abundant. 
*Chsetoceras contortum dominant. 
*Ch. debile dominant. 
*Ch. decipiens dominant. 
*Ch. laciniosum dominant (with en- 
docysts) . 
*Biddulphia aurita. 
*Chsetoceras atlanticum. 
*Ch. criophilum. 
*Ch. densum. 
*Ch. diadema. 
D. German Bank, April 15, 1920 — Continued. 
*Ch. didymum. 
*Ch. scolopendra S. 
*Coscinodiscus lineatus. 
Coscinosira polychorda. 
Lauderia glacialis. 
*Pleurosigma longum S. 
*Rhizosolenia semispina. 
*R. setigera. 
*Thalassiosira decipiens. 
*Th. gravida. 
Th. nordenskioldi. 
*Thalassiothrix longissima. 
*Th. nitschioides. 
E. German Bank, June 9, 1915, station 10290 
Diatoms in medium abundance. 
*Rhizosolenia semispina dominant. 
*Chsetoceras decipiens abundant. 
*Actinoptychus undulatus. 
Chsetoceras contortum. 
Ch. debile. 
*Ch. diadema. 
*Ch. laciniosum. 
*Coscinodiscus asteromphalus. 
*Navicula directa S. 
*N. lata S. 
*Nitschia seriata. 
*Pleurosigma normanii S., 
*P. stuxbergii S., 
*Rhaphoneis surirella S., 
*Rhizosolenia alata. 
*R. styliformis. 
Thalassiosira sp.? 
7. — Western Basin abreast of Massachusetts Bay 
B. April 18, 1920 — Continued. 
*Thalassiosira nordenskioldi abundant. 
*Biddulphia aurita. 
Chsetoceras densum. 
Ch. contortum. 
Ch. teres. 
*Ch. scolopendra. 
*Rhizosolenia setigera. 
*Skeletonema costatum S. 
*Thalassiothrix longissima. 
" At a neighboring station (20104) Doctor Mann also lists • Adinoptychus undulatus, • Chuicceras seiracanthum, and *Paralia 
sulcata. 
97 A station (20114) in the center of the basin that same day adds the following species, verified by Doctor Mann: Chsetoceras 
criophilum, Ch. didymum, Ch. furcellatum, Ch. teres ; Rhizosolenia alata; Thalassiosira gravida, Thalassiothrix nitschioides; also Ch. 
densum and Ch. contortum in another sample from station 20115. 
A. February 23, 1920, stations 20049 and 20058: 
Diatoms very scarce. 
Coscinodiscus sp. ? dominant. 
Chsetoceras decipiens. 
Ch. atlanticum. 
Ch. criophilum. 
B. April 18, 1920, station 20115: 67 
Diatoms moderately abundant. 
*Chsetoceras atlanticum dominant. 
*Ch. decipiens dominant. 
*Rhizosolenia semispina dominant. 
