GENUS SALPINGCECA. 357 



The successive phases of the life-history of this species as here enumerated, and 

 fully illustrated in the accompanying plate, show that, inclusive of the mature con- 

 dition, the animalcule exhibits consecutively the characteristics of no less than four 

 well-defined generic types of the Infusoria-Flagellata, commencing with the most 

 simple type of all, as furnished by the genus Monas, and passing thence through 

 those of Oikomonas and Monosiga to its characteristic adult one of Salpingceca. The 

 completion of the entire life-cycle by the encystment of the adult animalcule, followed 

 by its resolution into numerous spore-like bodies, Fig. 15, similar to that from 

 which it originally sprang, was ultimately observed. The contour of the lorica of 

 Salpingoeca infusionum corresponds most nearly with that of S. longipes, its propor- 

 tionately shorter pedicle, however, readily distinguishing it from that type. 



Salpingoeca campanula, S. K. PL. IV. FIG. n. 



Lorica goblet- or bell-shaped, scarcely longer than broad, the basal region 

 narrower, conically pointed, the anterior two-thirds expanding abruptly 

 and in a marked manner in comparison with the first-named area, the 

 anterior border widest, but not everted ; pedicle equalling the length of the 

 lorica ; contained zooid symmetrically ovate, occupying and projecting 

 slightly beyond the conical basal area ; the fully expanded collar enclosed 

 entirely within the wider anterior area of the cavity of the lorica, the 

 flagellum extending for about half its length beyond its anterior border ; 

 contractile vesicles two in number, posteriorly located ; endoplast spherical, 

 subcentral. Length of lorica 1-800". HAB. Salt water, solitary. 



The single example of this specific type so far observed was discovered by the 

 author attached to the carapace of an amphipodous crustacean allied to Gammarus, 

 at St. Hellers, Jersey, in February 1878. The form of the lorica coincides con- 

 siderably with that of the Codonceca costata of Professor Clark, and also, omitting the 

 pedicle, to a certain extent with that of Salpingceca ampulla, previously described, as 

 manifested by the complete enclosure of both the body of the zooid and its character- 

 istic collar within the cavity of the lorica, and by the adaptation of this last-named 

 element to the contours of these conjoint structures. 



Salpingceca convallaria, Stein. PL. IV. FIGS. 13-16. 



Lorica vase-shaped or campanulate, pointed posteriorly, inflated and 

 widest a little behind the median line, slightly constricted anteriorly, 

 scarcely one and a half times as long as broad ; pedicle very slender, 

 usually about one-third of the height of the lorica ; animalcule filling the 

 greater portion of the cavity of the lorica, the collar equalling the body in 

 height, protruding almost entirely from the orifice of the lorica ; contractile 

 vesicles multiple, posteriorly situated ; endoplast anterior, subcentral. 

 Length of lorica 1-1600" to i-iooo". 



HAB. Fresh water, attached to the branching pedicle of Epistylis 

 digitalis. 



The walls of the lorica in this species are described by Stein in his index to the 

 figures given,* as being remarkably soft and plastic. Excepting for the thick pedicle 

 and more constricted anterior border, it would appear to closely resemble the minute 



' Infusionsthiere,' Abth. iii., 1878. 



