. Dansk botanisk arkiv. Plants; Plants -- Denmark. 14 Dansk Botanisk Arkiv, Bd. 2, Nr. Fig. 7. Coscinodiscus Jonesianus (Grev.) nob., a, valvar view showing the position of two big processes, the small snbmarginal apicnli, the very small apiculi halfway to the centre and the central rosette of ar- eoles; b, valvar view showing a sector with chromatophores and the nucleus. (&%&). lensis Ostf., C. biconicus Van Breemen, C. centralis Ehbg. and C. con- cinnus Ehbg. Another species belonging hereto was rather common in Dr. Justesens sample (fig. 7). On closer examination of the older li
. Dansk botanisk arkiv. Plants; Plants -- Denmark. 14 Dansk Botanisk Arkiv, Bd. 2, Nr. Fig. 7. Coscinodiscus Jonesianus (Grev.) nob., a, valvar view showing the position of two big processes, the small snbmarginal apicnli, the very small apiculi halfway to the centre and the central rosette of ar- eoles; b, valvar view showing a sector with chromatophores and the nucleus. (&%&). lensis Ostf., C. biconicus Van Breemen, C. centralis Ehbg. and C. con- cinnus Ehbg. Another species belonging hereto was rather common in Dr. Justesens sample (fig. 7). On closer examination of the older literature I found that it could be identified with Eiipodiscus Jonesianus Greville; at the same time it became evident that C. biconicus Van Breemen was the same as Eiipodiscus ? vel Coscinodiscus commiitatiis Grunow (1. c, p. 79). Greville's description of his Eiipodiscus Jonesianus (1. c, p. 22) is not very good, but on comparing it with the figure, no doubt remains that we have here a Coscinodiscus, as also Van Heurck (1. c.) has pointed out. The figure showrs three large apiculi (processes) instead of two, but it is probably an error in drawing. Greville says that the structure is »minute«, and that ^the puncta in the centre of the disc are rather larger than the rest.« This makes it difficult to identify his species with Grunow's C. commutatus as Van Heurck (1. c.) and Rattray (Proc. Roy. Soc. Edinburgh, 16, 1888-89, p. 84) have done. Grunow (1. c.) says: »Mit C. concinnus hängt eine bisher verwechselte und übersehene, nicht seltene Art zusammen, welche ich Eupodiscus ? commutatus genannt habe, welche aber vielleicht besser bei Cosci- nodiscus bleibt. Sie kommt bei Cuxhafen, Brasilien, China, Java und im Peru Guano vor und hat zwei kleine marginale Anhängsel . Die kleinen Anhängsel von C. commutatus stehen nicht diametral gegenüber. Am Rande stehen kurze Stacheln, von denen, wie bei C. concinnus, kurze, oft schwer sichtbare Radien nach innen gehen,« He quotes A. S
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