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Show 228 MR. F. CHAPMAN ON FORAMINIFERA AND [Mar. 18, genus of the family, more especially as the inter-relationship of the three genera is apparently very close ; but, on looking into the structure of the skull, I find that in both Macroscelides proboscideus and M. rupestris there is a distinct optic foramen. The marsupial characters of the tympanic region are, however, as marked in Macroscelides as in the other genera. 4. On some Foraminifera and Ostracoda from Cocos Keeling Atoll, collected by Dr. 0. W . Andrews, 1898. By FREDERICK CHAPMAN, A.L.S., F.R.M.S.1 [Received February 25, 1902.] (Text-figures 27 & 28.) On his return from Christmas Island in 1899, Dr. Andrews was good enough to submit to the writer some sands gathered between tide-marks in the Cocos Keeling Islands for examination. A casual glance at the material was sufficient to prove it worth recording, and more especially since the samples were taken both from the lagoon and from the outer side of the atoll. Though far removed geographically, the microzoic fauna of Funafuti bears some striking analogies with the present collection, chiefly on account of the similarity of conditions in the habitats of the two faunas. A n especially noteworthy feature with regard to the gatherings now described is the frequent occurrence of the rare and occasional form Pavonina, chiefly on the lagoon side. With respect to the source of these samples, Dr. Andrews informs m e that those from the outer reef came from a spot at some distance from the transverse channels which communicate with the lagoon. The lagoon material came from the inner margin of the reef, and it would most likely be commingled to some extent with organisms washed in through the sea-channels; but the general facies of this series, however, points to their having lived in sheltered water. The species of Foraminifera are numerous for such a small gathering, amounting in all to 76. Some short notes are added regarding those which are of especial interest, either on account of their rarity elsewhere or their exceptional development. None of the forms appeal' to be actually new, but there are many peculiar modifications in form. The Ostracoda number 28 species, and include two new forms. They are nearly all well-known littoral species, and are fairly equally distributed both inside and outside the lagoon. Rotes on the Ostracoda from Cocos Island. The genus Bairdia is represented by 8 species, one or two of Communicated by C. D A VIES SHEEBOBN. |
