228 MR. F. CHAPMAN ON FORAMINIFEEA 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 Maa^oscelides pro- 

 hoscideus and M. rupestris there is a distinct optic foramen. The 

 marsupial charactei-s 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. C. W. Andrews, 1898. By 

 Frederick Chapman, A.L.S., F.R.M.S.' 



[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 mateiial 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. 



An especially noteworthy feature with regard to the gatherings 

 now described is the frequeiit occui'rence of the rare and 

 occasional form Pavonina, chiefly on the lagoon side. 



"With respect to the source of these samples. Dr. Andrews 

 informs me 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 ; 

 l>ut 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 appear to be actually new, but there are many 

 pecviliar modifications in form. 



The Ostracoda number 28 species, and include two new forms. 

 They are neai-ly all well-known littoral species, and are fairly 

 equally distributed both inside and outside the lagoon. 



Notes on the Ostracoda from Cocos Island. 

 The genus Bairdia is represented by 8 species, one or two of 

 * Communicated by C. Davids Sheebokn. 



