Transactions of the Society. 
302 
animalcules ; nuclei four in number, the nodules broadly ovate or 
subspherical, in close proximity to one another and apparently con- 
nected by a short funiculus ; contractile vesicles spherical, two or 
three in number, one usually in the anterior body-half, another in the 
posterior body-region, often with a third developed between them; 
endoplasm colourless, usually granular; trichocysts numerous, ar- 
ranged at right angles to the body-margin. Length of body, from 
1/150 to 1/200 in. Hab. — Brackish water from near Northport, 
Long Island, N.Y. Conjugation lateral. Collected by Mr. K. 0. 
Bogert. 
The dorsal region proper seems to be much softer and more com- 
pletely under the control of the animalcule than the other regions 
of the body. It is often seen to be variously indented, or irregularlv 
hollowed ; it may also at times be actually observed to undergo these 
alterations of form, whilst occasionally the entire mass of the elevated 
region may be seen to sway toward one side, as if its consistency were 
unusually slight. Yet the surface of the dorsal aspect bears several 
fine, hispid setae. 
In some individual animalcules the body- margin is so greatly 
upturned that the hook-like processes are directed inward, that is, 
toward the median line of the body, thus becoming very incon- 
spicuous. In these instances the hooks have seemed to be unusually 
small and numerous. 
Another form, sent to me from Coney Island, N.Y., by Mr. H. C. 
Wells, differs from that referred to in the foregoing description in 
that the hook-like appendages are exceedingly small, fine and incon- 
spicuous, so that they must be searched for carefully to be distin- 
guished amongst the rapidly moving cilia, whereas in the commoner 
forms the hooks are prominent. 
Litosolenus verrucosus sp. n. PI. Y. fig. 9. 
Body elongate-ovate, very soft and flexible, and somewhat change- 
able in shape, the right-hand body-margin often slightly flattened ; 
widest posteriorly, the frontal extremity usually obtusely pointed, 
occasionally the right-hand border obliquely truncate ; ventral surface 
convex, the lateral borders so much elevated that the body is almost 
boat-shaped, the dorsal margins of this elevated region bearing a 
varying number of rounded papilliform elevations, each with one or 
more tine setae, and often with several additional hispid setae; the 
space between the papillae usually concave ; dorsal region but slightly 
elevated, usually scarcely projecting above the level of the upturned 
lateral body-margin ; nuclei four in number, subspherical, located sub- 
centrally near the left-hand body-margin ; contractile vesicles multiple, 
arranged near the right-hand border; cuticular surface finely and 
longitudinally striate; trichocysts abundant, chiefly clustered in a 
fascicle within each papilliform elevation. Length of body about 
1 /120 in. Hab. —Brackish water, from a marsh on Coney Island, N.Y. 
