482 PROFESSOR E. RAY LANKESTER. 



istic of Haliphysema occur in all probability in the other 

 Arenaceous Foraminifera, and in other members of the group 

 also. Dr. Carpenter figures in his classical monograph 

 of the group, published by the Ray Society, certain 

 vesicular bodies from Orhitolites, which correspond in 

 size and general character with the vesicular nuclei of 

 Haliphysema. It is, however, possible that the bodies 

 found in Orbitolites are, as Mr. Moseley^ has suggested, 

 parasitic unicellular Algae. Those of Haliphysema are 

 certainly not parasitic, but integral parts of the organism 

 in which they occur. In the fresh state they are colourless, 

 whilst Mr. Moseley states that the corpuscles of Orbitolites 

 are green when fresh (probably coloured by chlorophyll), 

 and compares them with the yellow " cells "" of Radiolaria, 

 which have been supposed by Cienkowski to be parasitic. 



Egg-like bodies. — The vesicular nuclei are most abundant 

 in the basal portion of the core of Haliphysema. Ante- 

 riorly they are much diminished in number, and here I 

 found in several specimens that the protoplasm was seg- 

 mented into bodies of much larger size than the vesicular 

 nuclei, varying from the , ^ 'oo th to the -r^^-oth of an inch 

 in diameter. These bodies correspond very closely with 

 the " eggs " figured by Haeckel in his " isomorph " of Hali- 

 physema. 



The smallest of them (fig. 6) are devoid of nucleus, and 

 the constituent protoplasm appears to be vacuolated. In 

 the larger specimens the outline of the corpuscle is well 

 defined, but there is nothing like a wall or capsular invest- 

 ment. The protoplasm has the rather coarsely granular 

 character seen in egg-cells so usually, and a central nucleus 

 is after some care to be made out. I obtained these bodies 

 most satisfactorily for observation by teazing preserved 

 specimens of the Haliphysema. One which I have figured 

 is seen to be undergoing transverse fission. The formation 

 of such egg-like germs within the general protoplasm of a 

 unicellular Protozoon is entirely in accord with what is 

 known as to the reproductive process in such organisms. 

 There are numerous observations of long standing (see Car- 

 penter's ' Foraminifera ') which indicate such a formation of 

 nucleated germs within the substance of the shell-bearing 

 Reticularia, whilst the most recent observations on the 

 Radiolaria confirm the earlier observation of a similar pro- 

 cess in those allied forms. 



The body substance in general. — The vesicular nuclei and 

 the egg-like corpuscles are embedded in a finely granular 

 ' ' Notes of a Naturalist on the Challenger,' p. 293. 



