928 P. T. CLEVE, S. ATLANTIC PLANKTON. 



Vol. XVT PI. 2 f. 32) is not the form thus named by nie, bat 

 A. Hookeri. 



Asteromplialiis reticulatus Cl. (ßib. K. Sv. Vet. Akad. 

 Handl. I N. 11 PI. I f. 2 1873. Van Heurck Syn. CXXVII 

 f. 11). This species, whicb evidently belongs to another kind of 

 water than A. Hookeri, was met with at 41' — 43° S. 6° W. to 

 r E. and from 43 S. 73'^ E. to 33' S. 90' E. 



Chsßtoceros atlanticus Cl. In all samples from 41° S. 6' W. 

 to 45° S. 34° E.; at 44° S. 48° E. and 43° S. 73° E. 



This species, whicli on the whole is very little variable in 

 the arctic regions, exhibits in the southern Atlantic a great varia- 

 bility. It seems to nie as if the following forms were varieties 

 only of Ch. atlanticus: 



C. atl. var. exigua, Cl. 



C. audax ScHÜTT. 



C. skeleton ScHÜTT. 



C. cornpactum ScHÜTT. 



C. polygonwn ScHÜTT. 



C neapolitanum SCHRÖDER. 



Clisetoceros (atlanticus var.) exig'uiis Cl. (a Treatise on the 

 phyto-plankton PI. I fig. 9. C. neapolitanum SCHRÖDER Mittli. 

 aus d. Zool. Stat. zu Neapel Vol. XIV. I. PI. I f. 4). In 

 samples from 45° S. 29° E. to 44° S. 45° E. 



C. audax ScHÜTT. (Ber. d. Deut. Bot. Ges. 1895 XIII, 2, p. 

 47) represents isolated cellules of C. jjolygonus. It was found 

 in a sample from 44° S. 9° E. Schutt nientions it from the 

 Irminger Sea. 



Chsetoceros borealis Btw. was met with in samples from 

 42° S. 3° W. and 44° S. 45° E., in both sparingly. 



•C. criopliilus Castr. This form was found from 42° S. 

 3° W. to 44' S. 9° E. and at 44' S. 48° E. 



C. dichseta Ehb. (Abh. d. K. Acad. d. W. zu Berlin 1872 

 PI- XII f 3, 4, 1873. — Cl. K. Sv. Vet. Ak. Handl. XVIII 

 N. 5 p. 26 PI. VI f. 77. — C. remotus Cl. & Grün. K. Sv. 

 Vet. Ak. Handl. XVII N. 2- p. 120; 1880 — C. Janischianmn 



