298 
Transactions of the Society . 
VII . — Notices of some undescribecl Infusoria from the Brackish 
Waters of the Eastern United States. 
By Alfred C. Stokes, M.D. 
{Read 1 5th March , 1893.) 
Plate V. 
With a few exceptions, which are mentioned in the proper place, 
all of the following presumably undescribed Infusoria were observed 
amongst collections of filamentous Algae made from the brackish 
waters about Coney Island, N.Y., by Mr. Henry C. Wells, of New 
York City, and by him sent to me. 
Cothurnia fecunda sp. n. PL Y. fig 1. 
Lorica transparent, about three times as long as wide, compressed 
so that the anterior border is oval in outline, slightly everted, the 
margin smooth and even. ; broadest near the posterior one-third ; 
tapering thence to the somewhat acutely rounded posterior point of 
attachment, and anteriorly to the frontal aperture ; pedicle short, 
apparently passing through the posterior border of the lorica, longi- 
tudinally striate, and penetrating for a short distance into the cavity 
of the sheath, and there supplying the enclosed animalcule with an 
inconspicuous foot-stalk; cuticular surface finely and transversely 
striate. Length of lorica 1/225 in. Hab. — The brackish water of 
the Morris and Essex Canal, near Greenville, N.J. ; attached to 
filamentous algae. Social. 
This characteristic form is prolific and social, being often found in 
colonies on filamentous algae and on other small submerged objects, 
and frequently with two full-grown animalcules in the same lorica, 
the two so crowding each other that but one is capable of an incom- 
plete retraction into the sheath, the other simply folding its ciliary 
apparatus and making an ineffectual and spasmodic effort to retract 
itself into the cavity of the common sheath. The gathering amongst 
which it was found was made in the locality mentioned, and sent to 
me by Mr. Stephen Helm, of New York City. 
EXPLANATION OF PLATE V. 
Fig. 1. — Cothurnia fecunda , X 200. 
„ 2. — Cothurnia inflata , X 314. 
„ 3. — Cothurniopsis valvata, x 400. Lateral aspect. 
„ 4. „ „ „ Front view. 
„ 5. — Tintinnus tubus , X 325. 
„ <!. — Metarystis striatus, x 312. 
„ 7. — Lagynus ornatus, X 180. 
„ 8. — Litosolenus armatus, x 210. 
„ 9. ,, verrucosus, X 200. 
