i8S3.] 



MICROSCOPICAL JOURNAL. 



207 



ever, occasionally met with a form 

 in proper proportional height and un- 

 der an amplification corresponding 

 with that of . the other parts of the 

 figure, the foot-stalk would be about 

 five inches long. 



SALPINGfl-XA. 



The known pedicellate salpingoeci-e 

 having a fresh-water habitat are few. 

 Kent describing four only, of which 

 *but one, 6". Boltoni, S. K., seems to 

 have been collected in British waters ; 

 while from this countr)', excepting 

 the one marine and two aquatic species 

 discovered by H. James-Clark, none 

 of the genus have, so far as I am 

 aware, been recorded ; yet they are 

 not uncommon on the aquatic plants 

 of our still waters. 6*. ainphoridium, 

 J.-Clk., S. fnsifonnis, S. K., S. gracilis, 

 J.-Clk., can be collected almost at a 

 moment's warning, and a pedicellate 

 form, apparently undescribed has re- 

 cently come to my notice in some 

 abundance, which, on account of the 

 well-marked aGumination terminating 

 the lorica posteriorly, I have named 

 Salpingoeca acuminata. 



S. acuminata, n. sp. — Lorica vase- 

 shaped, widest at, or imyiediately 

 behind, the median line, thence poste- 

 riorly acuminate and tapering to its 

 junction with the pedicel ; anteriorly 

 evenly narrowing to form an everted 

 and somewhat constricted neck, about 

 one-fourth the height of the lorica ; 

 pedicel slender, its length once and 

 one-half to twice that of the sheath ; 

 the contained zooid taking the form of 

 the lorica, having an anterior, narrower 

 neck-like portion, and being somewhat 

 inflated posteriorly when not complete- 

 ly filling the lorica; nucleus anterior, 

 sub-central. Lorica j-Vitj zooid ^oVo 

 of an inch in height. Habitat. — Fresh 

 water, attached to Myriophyllutn. 

 Solitary, or one or two together. 



The species, so far as the shape of 

 the lorica is concerned, resembles the 

 sessilely attached fresh-water animal- 

 cule Sa/pingceca fusifortnis, S. K., but 

 is excluded from tlie section to which 

 Kent has relegated the latter, by the 



J 



possession of the pedicel. The like- 

 ness of the two forms is made still 

 more conspicuous by the marked 

 tendency of the body-sarcode of each 

 to exude beyond the anterior margin 

 of the lorica. With the animalcule 

 figured (fig. 41) it is frequently seen 

 extending in a tongue-like 

 manner into the space bound- 

 ed by the collar, or projecting 

 as a colorless globule, the 

 collar and flagellum having 

 been absorbed. In several 

 instances a sarcode sphere 

 was formed and remained 

 for an hour or more con- 

 nected with the zooid only by 

 a delicate thread, the ani- 

 malcule to all appearance 

 being about to undergo the 

 reproductive process by 

 transverse fission; but the 

 filament was eventually 

 thickened by a flow of pro- 

 toplasm from the extruded 

 globule, the whole then be- 

 coming a lobate projection 

 which was finally withdrawn 

 into the lorica . This was more than 

 once repeated by the same restless 

 individuals. Although the species does 

 not seem uncommon, at least not in 

 my pickle-jar-aquarium, where it has 

 increased and multiplied and replen- 

 ished the waters, one seldom appears 

 with the sarcode filling less than two- 

 thirds of the cavity of the lorica ; and 

 often while under observation the ani- 

 macule mysteriously increases in sub- 

 stance until it bubbles over in front, 

 and at times even occupies the poste- 

 rior hollow acumination. 



The pulsating vesicles contract 

 about once in eighteen seconds. 



Among the pedicellate species oc- 

 curring in salt water, the one to which 

 the form here figured and referred to 

 bears closest resemblance, is Sa/pingceca 

 urceolata, S. K. It is distinguished 

 not only by habitat, but by the more 

 spindle-shaped contour of the lorica, 

 the less sudden constriction anteriorly, 

 and the absence of the characteristic 

 elasticity of the neck. I have, how- 



FlG. 41- 



SAI.rlNf;CECA 

 ACUNIXATA- 



