GENUS VAMPYEELLA— VAMPYEELLA LATEEITIA. 255 



in figs. 10, 11, 13-15, or it may contain a few or numerous vacuoles, as 

 in Actinophrys, and as represented in figs. 12, 1G. A nucleus was not 

 observed, and, if existing, is concealed from view by the surrounding mate- 

 rial. Food, in the form of green algae, was noticed among the contents in 

 several individuals, as represented in fig. 15. 



The pseudopodal rays of the creature under consideration, which I 

 have taken for Vampyrella lateritia, have appeared to me to be of two kinds, 

 one of the ordinary character, resembling those of Actinophrys, while the 

 others have reminded me of the suctorial rays of Acineta. 



The ordinary rays are delicate, straight, usually simple, and of very 

 variable length; mostly shorter, sometimes longer than the diameter of 

 the body. Not unfrequently several together start from the same base. 

 They may project from a small portion or from the entire surface of the 

 body; sometimes being confined to the semi-circumference or a smaller 

 portion, and sometimes pi'ojecting everywhere, as in Actinophrys. 



The Acmeta-like rays are pin-like, or consist of a short stem ending in 

 a minute round head, and measure from 0.004 mm to 0.0125 mm. in length. 

 Like the ordinary rays, they may project from any part or the whole of the 

 surface of the body at once; and they may be mingled indiscriminately 

 with the former, or the two kinds may appear separated and issuing alone 

 from opposite poles of the body. 



The pin-like rays are especially remarkable for the quickness with 

 which they are successively projected and withdrawn. At times they are 

 projected only in the slightest degree beyond the outline of the body, and 

 rarely to a greater length than 0.0125 mm. 



Sometimes an individual when first noticed exhibits only ordinary rays 

 projecting from some portion or the whole surface of the body, and after a 

 while the pin-like rays in variable number issue from some portion or the 

 whole of the surface. 



Vampyrella glides along in the manner of Actinophrys, but commonly 

 with more speed. Frequently, while in motion, the pin-like rays issue only 

 on the side opposite to the direction of movement of the body, while ordi- 

 nary rays may project alone on the other side, as represented in fig. 14. 



Commonly both kinds of rays are directed perpendicularly, but occa- 

 sionally either may be seen projecting tangentially ; and while the pin-like 

 rays are incessantly and rapidly pushed forth and withdrawn, the ordinary 

 rays, usually apparently motionless, now and then are seen slowly to vibrate. . 



