3o0 DIATOMACK^, — HEMIDISCUS 



March: T N. 55^ W. 

 Jiuip: 10° N. 5H" \V. 



Temperature: 24. s, mean of o obs., max. 27.2. min. 21. o. 

 Salinity: 06.01 (one obs). 



Plankton-type. Noted from the Gulf of Guinea, tlie Mediter- 

 ranean, the tied Sea, Gulf of Hengal. Java and Japan. — Nt. 1). 



HEMIDISCUS CUNEIFORMIS Wallich. 



(Miciosc. .lourn. Vol. VllI, 1860 PI. II fig. 8 — 4. Kumlln nrfiuitu, Sr.iiii(tDER.) 



1897 Dect'inhi'i- and 



1898 January: 46' N. 11' W. to the Azores; 12^ N. 50" W. 

 Fchruai-y: Caribbean Sea; 34° N. 74"" "W. / 

 March: '^^^ N. 29° W.; Caribbean Sea. 



April: Caribbean Sea. 



May: 48' N. 25" W.; 48' N. 11- W.; Azores; 2H° N. 56' AV 



June: 48' N. 33° W.; Azores; 31" N. 17° W.; 19° N. 63° W. 



July: 49° N. 22° W.; Azores; Caribbean Sea. 



August: Azores; 44° — 42° N. 42°— 50°W.; Caribbean Sea. 



September: Azores; 66° N. 18° W., very rare; 9° N. 53° \V. 



October: 21° S. 36° W.; Azores; 56° N. 31° W.; 57° N. 18° 



AV.; Caribbean Sea. 

 Noveruber: Azores; 56° N. 23° W. 

 December: 29° S. 49° W.; Azores; 18' N. 67' W. 

 1898 January: 45' N. 49° W. 

 February: 34° N. 40° W. 

 April: 46° N. 13° W.; 41° N. 17° W. 

 OrtiJirr: 56' N. 31° \V. 



Temperature: 20. .1, mean of 53 obs., max. 28. i, min. 10.8, 

 exceptionally 7. 



Salinity: 35..5(i, mean of 34 obs., max. 36. .-.o, min. 32.og. 



Plankton-type. Occurs in the Mediterranean and Indian Ocean. 

 This species belonp;s the Styli-plankton of the western and eastern 

 warmer Atlantic. It occurs beyond 50' N. as rare specimens only 

 and was in September seen N. of Iceland. — S. 



