258 ORDER CHOANO-FLAGELLATA. 



imperfectly observed Flagellate organisms recorded by GreefF as adhering in numbers 

 to the pedicle of Epistylis flavicans, and reproduced from his drawings at Pi. III. 

 Figs. 22-24. According to Stein, this type multiplies within its lorica by longitudinal 

 instead of transverse fission, a phenomenon distinctly obsen-ed as yet of no other 

 representative of the genus. 



Salpingoeca oblonga, Stein. Pl. VI. Figs. 20-23. 



Lorica pedicellate, elongate-ovate or subfusiform, widest a little behind 

 the median line, tapering gradually towards each extremity, nearly two 

 and a half times as long as broad ; pedicle varying in length from one 

 half to nearly twice the length of the lorica ; animalcule usually occupying 

 the two anterior thirds of the cavity of the lorica, leaving the posterior 

 one vacant ; collar equalling the body in height ; contractile vesicles 

 multiple, posteriorly situated ; endoplast anteriorly located. Length of 

 lorica 1-1200" to 1-950". Hab.— Fresh water. 



In some of the examples figured by Stein,* including the delineadon reproduced 

 at PI. VI. Fig. 23, the animalcules have apparendy entered into a spheroidal encysted 

 state within the cavity of their lorica, the orifice of the same being closed by a lid- 

 like secretion. In another instance (see Fig. 22) two zooids are drawn, which 

 are explained by Stein in the index as illustrating an abnormal instance of longi- 

 tudinal fission, but which would seem quite as probably to represent the process of 

 fusion or genetic union between a larger sedentary and a smaller illoricate motile 

 zooid, or even an advanced phase of transverse fission closely resembling that of 

 Salpingxca inqinllata shown at PI. VI. Fig. 5. 



Salpingoeca Clarkii, Stein. Pl. VI. Figs. 17-19. 



Lorica elongate flask-shaped, from two to three times as long as 

 broad, slightly inflated and rounded posteriorly, tapering gradually 

 towards the anterior extremity, terminating in an attenuate, scarcely 

 everted neck ; pedicle straight, moderately stout, usually equalling the 

 lorica in length; animalcule nearly or entirely filling the cavity of the 

 lorica ; contractile vesicles multiple, posteriorly situated ; endoplast sub- 

 central. Length of lorica 1-1200". 



Hab. — Fresh water, attached gregariously to the carapace of the rotifer 

 Philodina hirsuta Ehr. 



In conferring the above title upon this form. Stein t appears to have overlooked 

 the fact that the same name had been previously proposed by Biitschli for a distinct 

 species of the same genus. As, however, Biitschli's type has been shown to corre- 

 spond with the Salpingoeca fusifonnis still earlier described by the author, Stein's 

 title to avoid a further change of name, is in the present instance, though somewhat 

 irreo-ularly, retained. In the chief figure of this species given by Stein no less than 

 forty individuals are represented crowded upon the projecting snout of the above- 

 named rotifer. One example among the isolated individuals he delineates has 

 withdrawn its collar and protruded its sarcode beyond the orifice of the lorica in 

 a bubble-like manner, while in another instance a thread-like pedicle connects the 

 body of the animalcule with the bottom of its protecdve sheath. Both of these 

 more abnormal cases are reproduced at Pl. VI. Figs. 18 and 19. 



* 'Infusionsthiere,' Abth. iii., 1878. f Ibid. 



