GENUS TINTINNUS. 603 



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

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

 throughout the general surface of the body. Dimensions unrecorded. 

 Hab. — Fresh water, among confervoid algae. 



Supplementary Species. 



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

 figured and described by Dr. C. T. Hudson under the title of Archimedea {Chceto- 

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

 opaque attenuate lorica, it would 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 Stickotricka, under which heading it receives fuller attention later on. This 

 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 ChcBtospira 

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

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

 extended 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 the representatives of Tintinmis, the type genus of the family, are 

 included 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 be present 

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

 Claparede and Lachmann with reference to this especial group. 



Genus I. TINTINNUS, Schrank. 



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 ; 

 peristome-field occupying the entire anterior border, circumscribed by a 

 more or less complex spiral wreath of long, powerful, cirrose 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 Tintinnus was instituted by Schrank * for the reception of the Trichoda 

 inquilinus of Miiller and two other doubtful loricate forms whose specific identity 



* ' Fauna Boica,' 1803. 



