MEMOIRS. 



Notes on some of the Reticularian Rhizopoda of the 

 "Challenger" Expedition. By Henry B. Brady, 

 F.R.S. With Plate VIII. 



II. — Additiotis to the knowledge of Porcellanous and 

 Hyaline types. 



In a former paper {' Quart. Journ.' for January) a brief 

 notice -was given of a few of the more interesting types of 

 Arenaceous Rhizopoda occurring in the dredged stuff brought 

 home by Sir C. Wyville Thomson and the scientific staff of 

 the "Challenger" Expedition, and I propose now to describe 

 a limited number of forms pertaining to other groups of the 

 Foraminifera, concerning which fresh facts have been 

 gathered, tending to elucidate the natural history of the 

 order. 



Porcellanea. 



In no section of the subject has so little that is new been 

 elicited from the " Challenger " results as in the Family 

 Miliolida of Carpenter, Parker, and Jones. Abundance of 

 large Bilocidince and the like are of course to be found in the 

 Globigerina-ooze of deep-sea bottoms, and there is consider- 

 able variety in the forms furnished by some of the shallower 

 dredgings from the tropics, but there is no such range of 

 well-marked modifications of the common types as one would 

 be pretty sure to meet with, for example, in material from 

 depths of five to fifty fathoms in the Red Sea; and as few 

 or no shore-sands were collected during the expedition, 

 there is a comparative absence of even the common littoral 

 species. The Miliolida ai-e to be regarded as essentially a 

 shallow-water and littoral group. It is true that the very 

 largest examples of certain genera are found amongst the 

 Glohiyerina-mwA of 1000 to 2000 fathoms, or even at greater 

 depths, but the species so occurring are very limited in num- 

 ber, and the specimens as a rule comparatively few, whilst in 

 shallow water and in shore-sands even the deep-sea species, 

 with one or two exceptions, are common, though the in- 



VOL. XIX. NEW SER. S 



