1 8 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [BuU. 



Description of Genera. 



Vampyrella Cienk, 



Ectoplasm hyaline, entoplasm usually brown or red ; 

 frequently vacuolated. Form amoeboid, changeable, 

 spherical, disk-formed, or elongated. Pseudopodia ray- 

 like, either arising on all sides or at one point. One or 

 more nuclei ; contractile vacuole not definitely made out. 

 Frequently there is found a gelatinous covering through 

 which the pseudopodia protrude. 

 Vamp, lateritia Fres., Fig, 25. 

 Nuclearia Cienk. 



Body spherical, disk-formed or elongated. Pseudo- 

 podia from all sides, or arising only in one place ; some- 

 times branching. One or more nuclei, and many con- 

 tractile vacuoles. Sometimes surrounded by a gelatinous 

 envelope. 

 Nu. simplex Cienk., Figs. 18 and 23. 

 Actinophrys Ehrbg. 



Usually spherical with pseudopodia on all sides, whose 

 axial thread can be traced to the nucleus lying in the 

 granular entosarc. The colorless ectoplasm not sharply 

 differentiated from the entoplasm. Usually a single con- 

 tractile vacuole. Multiplication by division. Occasion- 

 ally colonial. 

 Act. sol Ehrbg., Fig. 26. 

 Rhaphidiophrys Arch. 



Solitary or colonial. Spherical with delicate pseudo- 

 podia uniform over the body. No sharp differentiation 

 of the body substance. Nuclei, one or more, and several 

 contractile vacuoles. Skeleton composed of irregular, 

 loosely bound, straight or slightly bent silicious needles, 

 mostly tangential to the body surface and frequently raised 

 around the bases of the pseudopodia. Colonies have a 

 common shell. Sometimes with chlorophyll bodies. 

 Rhap. elegans H. & L., Fig. 31. 

 Clathrulina Cienk. 



Animals like Actinophrys, without differentiation into 

 body regions, with numerous contractile vacuoles, central 

 nucleus, and many delicate pseudopodia frequently forked 



