Recent and Fossil Foraminifera. 299 



desire to express our indebtedness to Mr. Herbert R. Lilley, of 

 Belfast, who has made the drawings which have illustrated our work, 

 and to Mr. F. W. Millett and Mr. Joseph Wright for assistance and 

 advice ungrudgingly given us on all occasions when it was sought. 

 The following must be added to the list of chalk-fossil forms 



(Art. V.) :— 



52. (h-a) Antiinid incus incertus d'Orbigny. 

 123. (h-a) Polymorphina gibba d'Orbigny. 

 127. (h-A) „ compressa d'Orbigny. 



360. Uviyerina asperula Brady. 

 210. Nonionina pompilioides Fichtel and Moll sp. 

 325. Textularia rugo&a Eeuss. 

 160. Discorbina orbicularis Terquem. 

 352. Nodosaria calomorpha Reuss. 



Gromia Dujardin. 



299. Gromia oviformis Dujardin. 

 299a. Gromia Dujardini Schulze. 



For a year now past we have been keeping under observation 

 in the tanks which we have described at some length in ' Know- 

 ledge ' * and in this Journal.f a large number of living specimens 

 of these two species of Gromia, both of which occur in abundance 

 in washings of algse from the Mixon Reef. We do not propose to 

 enter into any description of the observations which we have made, 

 reserving these for a future paper. 



Among the Mixon Reef gatherings we have met with many 

 specimens of the organism figured on Plate IX. figs. 1, 2. Of its 

 rhizopodal nature there can be no doubt, as sarcode is often found 

 adherent round its orifice. Beyond this we do not at present feel 

 disposed to form any conjecture. Its external form and size agree 

 very well with G. Dujardini, and that species in the living state 

 frequently covers its natural chitinous envelope with a loose crust 

 of sandy mud, but the sandy envelope of Gromia is not apparently 

 cemented together with any durable medium ; it can be removed 

 with a camel-hair brush without injuring the living animal, which 

 will proceed at once to form a second covering, which appears to us 

 to consist of mud separated by the pseudopodia from the surrounding 

 water during the assimilation of nutriment. Moreover, such in- 

 crusted Gromice, when dried in the same manner as the shore- 

 gatherings are dried, shrivel up into amorphous crinkled sacs, the 

 nature of which could not be ascertained from a mere casual inspec- 

 tion of the dried specimens. 



The specimens which we figure, however, are firm though some- 

 what flexible. They consist of a spherical chitinous envelope 

 covered with a uniform layer of very fine sand-grains, which are 

 so closely adherent to the envelope that they resist any attempt at 



* Knowledge, xxxiii. No. 504 (1910) pp. 285-6. 



t See this Journal, 1910, p. 695. Paper No. VI. of this series. 



