LIEBERKURNIA. 



345 



frequently blend together here and there, away from the body, or " anastomose" among themselves so 

 as to form irregular meshes of sarcode. Some of these animalcules possess the important " nucleus " 

 (Shephecmlella, Siddall), and one or more " contractile vesicles " (JBiomyxa, Leidy ; and Gromia, 

 according to Wallich), Among the 

 Foraminifera, some are said to have 

 yielded evidence of the presence of a 

 " nucleus." But it is possible that 

 these apparently nuclear bodies are 

 " sarcoblasts," either isolated or in 

 groups, especially when the granular 

 forms have come to light by the inter- 

 vention of re-agents. 



In effect, fresh specimens show 

 nearly clear and quite pale " nuclei," 

 or none at all ; and those subjected 

 to re-agents show granular bodies, 

 like "nuclei," pale or darkish, and 

 sometimes with a central spot, either 

 dark or pale. In the first case, the 

 presence of definite globular bodies, 

 besides nuclei, in Rhizopods, must be thought of ; and, in the second case, the effect of chemical re- 

 agents on the (1) sarcodic granules, and (2) on the endoplasts (sarcoblasts) in Rhizopods, must be 

 allowed for before the above-mentioned corpuscles in certain Miliolce and Planorbulince (?) can 



Fig. 12. EUCECUYPHALVS SCHULTZEI. 



A living Radiolirian of the Cyrtidan family : off Messina. Highly magnified. (After 

 aueckel.) Tins is tipped up a little, so as to show the body with its sarcoblasts inside. 



be regarded as true nuclei. 

 XL V. Lieberkuhnia * 



\ 



Fig. 13. GUOMIA TElUUC'Ot.A. 



Animalcule with .1 filmy coat of sarcode and extruded, intrrlarmL', and reticu- 

 late peeudopods. Thr transparent envelop- i-hnws a larae nucleus, vacnoles, 

 oil-globules, anil fiu.il within. Sand and dirt adhere at the hinder end 

 ibeiow i. Magnified too dimeter*, (After Leidy.) 



is a simple, granular, non-nucleated, thin-skinned Rhizopod, with 



vacuoles. It is egg-shaped, and sends off from 

 one part of its body a stem-like process, at 

 first within a filmy coating of the general 

 sarcode, but soon branching off again and 

 again into finer and finer filaments. These 

 coalesce freely, and form islets here and 

 there among the shifting and changing re- 

 ticulations. The granules of the protoplasm 

 have the usual circulatory movement, some- 

 what like that visible in Valisneria, Nitella, 

 and other plants, but of a different physio- 

 logical character, not being so regular, and 

 evidently more dependent on the actual 

 movements of the animal. This rare animal- 

 cule was first described and figured by 

 Claparede and Lachman in their " Les Infu- 

 soires et les Rhizopodes." Mr. Siddall 

 found it in sea-water. 



XLVI. Biomyxa,^ discovered by Dr. 

 Leidy, has been described by him as a 

 fresh-Wiiter Rhizopod, soft, glairy, colourless, 

 unconfined by any external envelope or test, 

 and incessantly changing in shape. It has 

 one " nucleus," or more, and several " con- 



tractile vesicles," in its -spherical state, and 

 sends off numerous attenuated and anastomosing! pseuclopods. Granular "circulation" is seen in 



* Lklvrkuhn, a famous microscopist. t Greek, bios, life ; myxa, mucus. 



* Greek, ami, through, among ; stomoo, I furnish with a mouth, I open. Applied originally to the junction of veins and 

 tubules, whereby they open one into another. 



282 



