GENUS TLXTIXXUS. 603 



anterior extremity, the foremost one in particular being twice as long and 

 thick as any of the succeeding ones; supplementary fine setJE developed 

 throughout the general surface of the body. Dimensions unrecorded. 

 Hab. — Fresh water, among confervoid aigas. 



Siipphmcntary Species. 



In the 'Monthly Microscopical Journal ' for October 1875, an animalcule is 

 figured and described by Dr. C. T. Hudson under the dtle of Anhimedea {C/urto- 

 spira) remex. As seen only with the twisted anterior extremity protruded from the 

 opaque attenuate lorica, it woukl seem to possess a strong claim for admission to 

 the present genus ; Dr. Hudson's representation, however, of the animalcule in its 

 free-swimming state, demonstrates it to be a Hypotrichous form referable to Perty's 

 genus Stic/ioirie/ia, under which heading it receives fuller attention later on. Tliis 

 same species has been met with by Mr. Thomas Bolton, and has been referred 

 ■to by him in the 'Midland Naturalist' for 1875 under the name of Cluetospira 

 eylindnca, a title provisionally conferred upon it by the present author when familiar 

 only with Mr. Bolton's delineations of the animalcule as seen in its sedentary semi- 

 e.\tended condition. 



Fam. IV. TINTINNOD^, C. & L. 



Animalcules free-swimming or sedentary, mostly inhabiting an indurated 

 sheath or lorica, to the bottom or side of which the ovate or pyriform body 

 is usually attached by a retractile pedicle or thread-like prolongation of the 

 posterior extremity. Oral aperture eccentric, terminal or subterminal, peri- 

 stome subcircular, bordered by a single or complex, evenly circular or spiral 

 fringe of large cirrate cilia; the general cuticular surface more or less 

 completely clothed with fine vibratile cilia. 



By Stein die representatives of Tintinnus, the type genus of the family, are 

 inchuled among the Peritricha, he having failed to detect in the few examples he 

 examined the presence of the fine cuticular cilia so amply demonstrated to l)e present 

 in a number of species through the more extensive researches prosecuted by Messrs. 

 Claparfede and Lachmann with reference to this especial group. 



Genus I. TINTINNUS, Schraidc 



Animalcules ovate or pyriform, attached posteriorly by a slender 

 retractile pedicle within a more or less indurated sheath or lorica; the 

 lorica floating freely in the water, not attached to foreign organisms ; 

 pcristomc-ficld occupying the entire anterior border, circumscribed by a 

 more or less complex spiral wreath of long, powerful, cirrosc cilia, the left 

 limb or extremity of which is spirally involute and forms the entrance to the 

 oral fossa ; this fossa continued into the substance of the parenchyma as 

 a short, tubular pharynx ; anal aperture posteriorly situated, subterminal ; 

 cuticular cilia very fine, distributed evenly throughout, clothing both the 

 body and the retractile pedicle. 



The genus Tinf limits was instituted by Schrank * for the reception of the Trichoda 

 inqtiUinus of M tiller and two other doubtful loricate forms whose specific idendty 



' Fauna Uoica,' 1S03. 



