26 P. T. CLEVE. PLANKTON COLLECTED BY THE SWEDISH EXPEDITION TO SPITZBERGEN. 
Acanthometron quadrifolium, as transitional forms exist. I therefore include this form in 
A. quadrifolium. 
Surface: Deep-sea hauls: 
é ; i rf 
| Date. | Lat. N | Long. . ‘emp. Sal. Fq. | Pl. | | Date. Lat. N. | Long. | Depth. Fq. Pi. 
? | ! , 
4IN 7243’ 143 EB] 8.38 35,01 | » | tpNs | 26-87 VN) 77°39] 118.7 500-0 m. | + Ts 
| IX 757) 19B. | On | S496 | ¢ | mia} LIX | 75°60" | 15°25'R.' 325-0 » | + 8 
lasix aviv ligase! 940 | 3402 © | tpXs | 
61x 70°99 20°92! «oar * Bhar | + | tx! 
Acanthonia Miilleri Hx. 
Surface: 
Date. | Lat. N.j; Long. Temp. Sal. Fq. Pl. | 
2 1X 7°50’ | 15°32 E.} 5,52 35,01 ? ST 
| sax 'crsr 98. | oox | s4g5 + | mere | 
Habitat: Mediterranean (HKL.). — Styliplankton of the warmer Atlantic (CL.). 
Actinomma boreale Cr. N. sp. 
a. Primordial shell. Thick walled, 0,06 min. in diameter, with rounded, regular 
pores (0,003 to 0,005 mm. in diameter), two to three times broader than the bars, four 
on the radius. Spines in variable number, with triangular and forked apophyses half 
way to the apex. — Pl. I, fig. 5 a. 
b. Secundary (Haliomma-)shell. Thick walled, 0,08 mm. in diameter, with rounded 
pores of unequal size (0,01 to 0,02 mm. in diameter), three to four on the radius. Bars 
0,oo2 to Q,oos mm. thick. Spines in variable number, stout shorter than the radius, 
scattered at intervals. — Resembles Haliomma beroes. — Fig.: Pl. I, f. 5 6. 
e. Tertiary (Actinomma-)shell. Thin walled, 0,1 to 0,12 mm. in diameter, with 
numerous, small (0,002 to 0,007 mm. in diameter), irregular rounded pores. Bars as broad 
as the pores. Spines numerous, scattered, half as long as the radius. — Fig.s Pl. h 
f. 5 ¢; d structure. 
Deep-sea hauls: 
Date. Lat. N. Long. Depth. Fq. Pi, 
29—30 vil) 78°13" | 258 W.| 2600-0 my ae 
1vint | 76°36’ | 12°13'B. | 500-0» | » | ors | 
27 vill | 79°58 | y3yEe.| 400-05] » ae 
LIX | 75°50 | istes'e. | ge5-0>] » 5 | 
ST 5 SER | te S| eso GP 
