GENUS TINTINNUS. 609 



Tintinnus annulatus, C. & L. PL. XXXI. FIG. 25. 



Lorica subcylindrical, irregularly inflated posteriorly, terminating in a 

 short acuminate point, the anterior margin not everted ; consistence opaque 

 and coarsely granular through the incorporation of foreign particles; the 

 posterior body-portion exhibiting several annular constrictions. Animalcule 

 not observed. Length 1-120". 



HAB. Salt water : Norwegian coast. 



Tintinnus campanula, Ehr. PL. XXXI. FIG. n. 



Lorica campanulate, widely dilated anteriorly, tapering posteriorly, 

 terminating in an attenuate point ; substance coarsely granulate through 

 the incorporation of foreign particles. Body of animalcule occupying when 

 retracted about one-half of the cavity of the lorica. Length of lorica 

 1-166" to 1-125". HAB. Salt water: Norwegian coast (C. & L.). 



Claparede and Lachmann propose to identify the form, as here figured, with the 

 species first introduced under the same title by Ehrenberg, but with no illustration, 

 in the ' Monatsb. der Berlin. Akad.,' p. 201, 1840. While, however, Ehrenberg's 

 brief diagnosis of his Tintinnus campanula appears to accord with the present type, 

 the dimensions of the lorica, as given by him, are much more minute, not exceeding 

 1-288". 



Tintinnus ventricosus, C. & L. PL. XXXI. FIG. 31. 



Lorica coarsely granulate, ventricose or bottle-shaped, nearly as broad 

 as long ; the wider anterior portion surmounted by a short, narrow, slightly 

 everted neck, terminating posteriorly in an obtuse point. Animalcule 

 unobserved. Length of lorica 1-250". 



HAB. Salt water : Norwegian coast. 



Tintinnus urnula, C. & L. PL. XXXI. FIG. 3. 



Lorica cylindrical, transparent and homogeneous, of a slightly smoky 

 hue, little over twice as long as broad, terminating posteriorly in a 

 sharp subulate point; the anterior region not everted, ornamented at a 

 little distance from its terminal margin with a raised border or annulation. 

 Length of lorica 1-175". HAB. Salt water : Norwegian coast (C. & L.). 



Claparede and Lachmann merely remark of this animalcule that it possesses a 

 single contractile vesicle. In their drawing of the species, here reproduced, they 

 represent an example that is apparently preparing to increase by fission. In this 

 instance a second fascicle of cirri is in course of development at the posterior 

 extremity, its position corresponding closely with that assumed by the posteriorly 

 affixed zooid of a Vorticella during the act of conjugation. It is just possible that a 

 similar interpretation might be applied in the present case. 



Tintinuus Ussowi, Mereschk. PL. XXXI. FIG. 4. 



Lorica transparent, attenuate, straight, subcylindrical, ten or twelve 

 times as long as broad, slightly widest anteriorly, tapering gradually back- 

 wards, and terminating posteriorly in a sharply acuminate or subulate pro- 

 longation ; the anterior third ornamented with from twelve to fifteen finely 



VOL. II. L 



