GENUS SALPINGCECA. 355 



lorica ; pedicle straight and rigid, equalling or exceeding the length of the 

 lorica. Length of lorica 1-2500". 



HAB. Salt water, solitary or scattered. 



This little animalcule was obtained abundantly in February 1877 in sea- water 

 from Brighton in company with S. curvipes, with which the shape of its lorica 

 somewhat corresponds. It is at once to be distinguished from that form, however, 

 by the much greater length of the pedicle and by the entire absence of the curvature 

 of either this element or the posterior extremity of the lorica. The shape of the 

 anterior extremity of the protective sheath is subject to individual variation, being 

 often so narrowed as to communicate to the whole a subfusiform contour. The 

 phenomena of multiplication by transverse fission, as observed by the author, possess 

 much interest. The most prominent successive phases of this process are illustrated 

 at PI. VI. Figs. 2-5. In the first condition observed, as represented by Fig. 5, the 

 body of the animalcule had become divided by a median constriction into two equal 

 subspherical portions, the upper one still retaining the characteristic hyaline collar 

 and flagellum, tilted, however, to one side, while from the anterior surface of the 

 posterior segment there was projected a slender pseudopodic extension of the 

 sarcode. In the next stage, Fig. 2, the filamentous flagellum of the anterior half 

 was the only appendage visible, the collar having become entirely absorbed. This 

 flagellum was shortly after withdrawn in a similar manner, the succeeding meta- 

 morphosis exhibited being delineated at Fig. 4. Here the anterior and posterior 

 halves had separated considerably from one another, but at the same time remained 

 connected by a thin cylindrical film of sarcode, which constituted for the time being 

 a representation of the hyaline collar, but common to both of the imperfectly seg- 

 mented moieties. Ultimately the lower or posterior half assumed the entire possession 

 of the newly developed hyaline collar, while the anterior one, detaching itself 

 completely, drifted away as a simple plastic sphere of sarcode. The last stage, 

 prior to the ultimate separation of the two halves, is shown at Fig. 3. A recently 

 attached collarless zooid, derived by the process of segmentation as just described, 

 and in the act of constructing, by exudation, its characteristic lorica, is seen 

 at PI. VI. Fig. 6. 



Salpingoeca curvipes, S. K. PL. V. FIG. 19. 



Lorica somewhat attenuate, nearly three times as long as broad, widest 

 in the centre and at the expanded anterior margin, slightly constricted 

 between these two areas, the tapering posterior extremity slightly curved ; 

 pedicle short, not more than half the length of the lorica, joining in the 

 line of curvature characteristic of the posterior extremity of that structure ; 

 contained animalcule ovate, occupying one-half of the cavity of the lorica. 

 Length of lorica 1-2500". 



HAB. Salt water, solitary. 



The protective sheath of this very elegant little species is easily recognized by its 

 elongate outline and the graceful curve shared by both the short pedicle and its own 

 posterior extremity. It has been found sparingly in company with many other 

 representatives of the same order attached to the hydrothecae of Sertularian and 

 other zoophytes procured from Brighton. 



Salpingoeca napiformls, S. K. PL. V. FIGS. 25 AND 26. 



Lorica napiform or turbinate, depressed, widest centrally, pointed 

 posteriorly and further produced as a short, rigid pedicle, the anterior region 

 constricted, forming a narrow and slightly everted neck ; contained animal- 



2 A 2 



