ZOOLOGY AND BOTANY, MICKOSCOPY, ETC. 659 



divided into two, and on the next day tliere were two complete a" ; 

 one of these was again cut with the same result, and one of the a'" 

 in a similar way, with the like result. Further experiments have 

 strengthened the belief of the author in the value of the nucleus in 

 regeneration ; pieces without a nucleus did well, but never grew up 

 into complete animals. 



Vorticellae with Two Contractile Vesicles.* — Dr. A. C. Stokes 

 points out that besides Vorticella Lockwoodii Stokes, and V. monilata 

 Tatem, the following species of the genus possess two pulsating 

 vacuoles, a point in their structure which has been overlooked, viz. : — 

 V. vestita Stokes, and V. rliabdopliora Stokes. The presence of double 

 vesicles has so far been observed only in such members of the genus 

 as possess some form of cuticular investment or of surface ornamenta- 

 tion rather, than transverse strise. As these species are apparently 

 more highly organized, and presumably somewhat higher in the scale 

 than are the smooth or simply striated forms, so are they slightly 

 more complex in structure. 



New Fresh-water Infusoria.t— Dr. A, C. Stokes describes some 

 new fresh-water Infusoria from shallow ponds in central New Jersey. 



Heteromita mutahilis n. sp. is remarkable for the presence and 

 variety of the posterior protrusions of the body-sarcode. From H. lens 

 (Miill.) S.K., it can be distinguished by its normally ovate or sub- 

 pyriform contour, but chiefly, apart from the posterior changes of 

 shape, by the diverse length and thickness of the flagella. 



Fetalomonas carinata n. sp. seems to combine the characters of 

 P. ahscissa (Duj.) Stein and of P. mediocanellata Stein, the former 

 bearing one or two dorsal keel-like elevations, and the latter having a 

 groove traversing its ventral surface, while P. carinata possesses 

 both in a marked degree. It is much the smallest member of the 

 genus hitherto observed. Zygoselmis acus n. sp. has its favourite 

 haunt in dead and partially emj)ty algal cells. Anisonema emarginatiim 

 n. sp. EntosipJion ovatus n. sp. is much larger than E. sulcatus (Duj.) 

 Stein. Tillina flavicans n. sp. somewhat closely resembles T, injlata 

 Stokes, which is here diagnosed and figured for comparison. Lacry- 

 maria truncata n. sji. is the only fresh-water member of the genus thus 

 far observed. It is remarkable for the very long and band like 

 nucleus, and especially for the capacious conical pharyngeal 2)assage 

 which has hitherto not been recorded as appearing in any of the 

 several marine species. Colpidium truncatum n. sj^. differs from the 

 hitherto single known member of the genus in the oblique truncation 

 of tlie frontal border, the single nucleus, and the position of the con- 

 tractile vesicle. Vorticella octava n. sp. is characterized by the 

 peculiar twisted appearance of the sheath about the pedicle ; in none 

 of the previously described Vorticelloi has such an aj^pcarance been 

 noted. UroHtijla trichogasler n. sp. was for some time the 2jre- 

 vailing form in a vegetable infusion, gliding over the fungoid slime 

 on the surface as visible whitish spots. By transmitted light it is 



• Araer. Mon. Mifr. Joiirn., vi. (188.5) pp. .52-.'{. 



t Ann. and Mag. Nat. IliHt., xv. (1885) pp. 4:J7-41) (I pi.). 



