AND ITS INTERNAL STRUCTURES. 311 



of sponges and seaweed, with muddy ooze containing Lima and 

 other mollusca. 



" At the time of my first visit to Mr. Barclay's the weather 

 had been veiy fine for days — light winds from the north-east and 

 very little sea on." 



So much for Mr. Matthews' recollections of the gathering, 

 which are sufiicient to prove that the occurrence of this deposit 

 was altogether abnormal. 



I will now give you in some detail what we already know about 

 this singular foram, and subsequently describe some new features 

 in its structure which I have lately made out. C. bulloides was 

 first described and figured in 1839 by d'Orbigny under the name 

 of Rosalina bulloides, d'Orb. (A). The genus Rosalina contained 

 a number of heterogeneous forms which have long since been 

 separated into different genera. D'Orbigny's description of the 

 form is as follows : — 



"Shell a globular spiral, perforated, reddish, convex above and 

 below ; spire bluntly convex, with four distinct coils; chambers 

 scale-like, the last one much swollen. Diameter, ^ mm. . . . 

 Perforations very marked, especially those on the lower side of 

 the last chamber, each of which is surrounded by a little collar. 

 . . . Chambers five in each convolution, convex, the last chamber 

 partly covering all the others, and looking like a large trans- 

 parent ball, obscuring |^ths of the under surface. We have not 

 been able to discover any opening. Perhaps none exists, or it 

 may be hidden underneath. 



" Colour very pale red, most marked at the apex of the spire. 

 The last chamber nearly white." 



The genus Cymbalo'pora was instituted by Hagenow in 1850 

 for some fossils occurring in the chalk of Maestricht, and 

 Carpenter assigned d'Orbigny 's specimens to this genus (B). 

 Carpenter in his description of the species writes : " The whole 

 of the base is occupied by a single large chamber, the wall of 

 which, instead of being furnished with its normal aperture, is 

 perforated by numerous large ' orbuline ' lipped pores." 



For some reason or other, probably owing to its restricted 

 distribution, the species did not receive any further notice until 

 1880, when Professor Moebius published his monograph on the 

 Foraminifera of the Island of Mauritius (C). He described and 

 illustrated the form with some minuteness, pointing out details 



