GENUS SALPINGCECA. 349 



inwards of portions of the normal sarcodic investment of the shell, and by Wallich 

 as the product of shell-secretion round extruded masses of sarcode. Comparison 

 of these structures, however, as figured by Dr. Wallich and here reproduced, with 

 the loricae of various Salpingcecce, such as S. amphoridium or S. minuta, reveals so 

 remarkable a similarity of outline and correspondence in size, that the conclu- 

 sion has been arrived at by the author that the two represent similar elements. 

 Such being the case, it would appear that these loricae are developed upon the 

 shell-surface of the Foraminifera at an early stage of their growth, becoming, as 

 this covering thickens, gradually surrounded and immersed within it, much in 

 the way as certain Mollusca and Cirripedes, e.g. Magilus and Pirgoma, are found 

 embedded within the hard calcareous sclerobase of madrepores or stony corals. 

 Should the interpretation of these minute flask-shaped parasitic bodies, as here 

 suggested, be correct, a further careful investigation may be expected to reveal 

 their presence attached to and standing out independently from the external surface 

 of Globigerina in their earlier, thin-shelled, floating state. 



Salpingceca petiolata, S. K. PL. III. FIG. 26. 



Lorica sessile, subcylindrical, about twice as high as broad, rounded 

 posteriorly, the oral aperture not everted ; contained zooid cylindrical, its 

 length equal to about two-thirds of that of the lorica, to the bottom of which 

 it is affixed by a slender thread-like pedicle. Height of lorica 1-1700". 



HAB. Salt water, solitary or scattered. 



This species has been obtained by the author in some quantity at St. Heliers, 

 Jersey, in sea-water containing Polyzoa and hydroid zoophytes obtained from the 

 adjacent coast, which had been left standing in open jars for some months. While 

 the lorica corresponds chiefly with that of the fresh-water S. cylindrica, the contained 

 animalcule differs essentially in its possession of a slender pedicle. Several examples 

 were met with in which the zooids had entered upon an encysted condition within 

 their loricae. All traces of the collar, flagellum, and pedicle had, under these con- 

 ditions, disappeared, the body being contracted into a simply ovate form within the 

 furthest recess of its transparent domicile. It will possibly be desirable later on to 

 establish a new generic title for those species at present retained in the genus 

 Salpingceca in which the animalcule is affixed, as in the present instance, within its 

 lorica through the medium of a separate thread-like pedicle. 



Salpingceca ampulla, S. K. PL. III. FIGS. 17-21. 



Lorica sessile, narrow and ovate beneath, expanding superiorly in an 

 inflated, balloon-like manner, the external surface frequently exhibiting 

 even longitudinal sulci or striations ; animalcule, including the hyaline 

 collar, entirely enclosed within the lorica, and attached to the bottom of this 

 structure through the intermedium of a slender thread-like pedicle; the 

 smaller posterior portion of the lorica enveloping the body, and the balloon- 

 shaped anterior one the expanded collar of the contained animalcule. 

 Length of lorica 1-1250", of animalcule's body 1-4000". 



HAB. Salt water. 



This very beautiful variety is readily distinguished from all other representatives 

 of the genus Salpingceca hitherto described, both on account of the remarkable shape 

 of the lorica, and from the fact that the whole of the animalcule, including even 

 the flagellum and hyaline collar, is completely enclosed within that structure. 

 This last-named feature, which is shared to some extent by the stalked form 

 Salpingceca campanula, might in fact be considered as of almost sufficient im- 



