NOTES ON SPECIES 155 



Family COSCINODISCACEAE, Schroder, 191 1 



Genus Coscinodiscus, Ehrenberg, 1839 



Coscinodiscus bouvet, Karst. 



Karsten, 1905, p. 83, pi. iii, fig. 9; Mangin, 1915, p. 52, fig. 36. 



By far the most important member of the genus in southern waters at any distance 

 from land. Recorded off South Georgia at a few spring stations, and more plentifully 

 by Hardy (in press) later in previous years. Abundant at the South Sandwich 

 Islands in February 1930 where it was found to be sinking to great depths as observed 

 by Hardy. Consistently present in small numbers inshore on the southern side of 

 Bransfield Strait, at the Palmer Archipelago, the Biscoe Islands and off Adelaide 

 Island. Much more common in the Weddell than in the Bellingshausen Sea. 



Coscinodiscus centralis, Ehrb. 

 Lebour, 1930, p. 39, figs. 16-18. 

 Forms apparently referable to this northern species were recorded at two stations of 

 the spring survey round South Georgia, where it had previously been recorded by 

 Hardy. 



Coscinodiscus stellaris, Roper. 



Gran, 1905, pp. 37, 38, fig. 40; Lebour, 1930, p. 49, pi. iii, fig. 9. 



A form identical with the figures of European workers in all respects save that the 

 stellate arrangement of the central punctae was not quite so definite was found abund- 

 antly in the inshore plankton round South Georgia, and at one station in the Bellings- 

 hausen Sea. Its determination rests principally on the highly characteristic girdle view. 



Coscinodiscus spp. 



Occurred at a majority of the Antarctic stations, but in entirely subordinate numbers. 

 The difficulties of their identification being great, it was manifestly impossible to de- 

 termine all the species in working through such a large number of plankton hauls 



(see pp. 17, 18). 



Genus Planktoniella, Schiitt, 1893 



Planktoniella sol, Wallich. 



Lebour, 1930, p. 50, pi. i, fig. 5. 

 An oceanic species of temperate and tropical seas. Recorded at four stations on the 

 homeward voyage along the 30th W meridian, one in sub-tropical water, the other three 

 in tropical surface water from 03° lyf S to 14° 27^' N, i.e., at the extreme northern 

 end of the line. Abundant in material from the Agulhas and Benguela streams which 

 has not been described in detail for this paper. 



Genus Asterolampra, Ehrenberg, 1845 

 Asterolampra sp. 



Asingle individual was observed just north of the Equator inlong.30°W. It resembled 

 A. marylandica in all respects but for the possession of eight radii instead of seven. 



