GENUS DICTYOCYSTA. 625 



expanded anterior aperture ; perforations minute, polygonal, subequal, and 

 closely approximated ; animalcule elongate-conical, projecting some little 

 distance beyond the orifice of the lorica ; tentacular-like cilia nearly equal 

 in length to the extended body; contractile vesicle spherical, posteriorly 

 situated. Length of lorica 1-225". 



HAB. Salt water : Messina (Hkl.) ; British Channel, Falmouth (S.K.). 



Among the examples of this species figured and described by Professor Haeckel,* 

 one was observed to contain about twenty spherical spore-like bodies, each of which 

 enclosed a conspicuous central endoplast. In July 1879, an empty lorica of this 

 type was obtained by the author in association with Tintinnus subulatus, Ceratium 

 fusus, and other pelagic forms, off the coast of Falmouth, mention of such capture 

 being recorded in the ' Midland Naturalist' for April 1880. As there intimated, its 

 occurrence at a station so considerably to the north of the apparent head-quarters 

 of this type, is a feature of some interest. Upon the grounds that the lorica in 

 this species is not actually perforated but simply pitted, Professor Folf has pro- 

 posed to make it the type of a new genus, Cyttarocysta. Such structural character, 

 however, is not regarded by the author to be sufficiently substantiated, or of sufficient 

 import as to render such subdivision desirable. This authority further dissents from 

 Professor Haeckel in declaring that the body of the animalcule does not gradually 

 taper off to its point of attachment as delineated in the accompanying figure, but 

 that it is subdivided into a distinct inflated body and an attenuate stalk-like portion, 

 as occurs among many typical Tintlnni. 



Dictyocysta mitra, Hkl. PI. XXXII. FIGS. 25 AND 26. 



Lorica mitre-shaped, nearly as broad as long, widest centrally, obtusely 

 pointed posteriorly, slightly constricted immediately behind the slightly 

 everted anterior aperture, its walls pierced by numerous rounded perfora- 

 tions of various sizes, including a single series of about five larger somewhat 

 quadrate perforations arranged in a circle close to the anterior border, and 

 about four transverse circles of largish rounded perforations between this 

 and the posterior extremity; various smaller loculi interspersed among 

 the larger ones and developed exclusively towards the posterior extremity ; 

 animalcule campanulate, subglobose ; tentaculate cilia equal to or sur- 

 passing the body in length ; contractile vesicle posteriorly located ; endoplast 

 band-like, curved, transversely placed. Length of lorica 1-375". 



HAB. Salt water : Messina and Lanzarote (Hkl.). 



Professor Fol considers this species to be synonymous with the Dictyocysta elegans 

 of Ehrenberg. 



Dictyocysta templum, Hkl. PI. XXXI. FIG. 27. 



Lorica inflated, cupola-shaped or hemispherical, nearly as broad as long, 

 pointed posteriorly, the anterior aperture dilated ; fenestrations of variable 

 dimensions ; seven exceedingly large, equal sized, irregular quadrate areas, 

 separated from one another only by slender, obliquely parallel, pillar-like 

 trabeculse, bordering the frontal margin ; seven roundly polygonal 



* " Neue pelagische Infusorien," ' Jenaische Zeitschrift,' Bd. vii., 1873. 

 t ' Archives des Sciences Physiques et Naturelles,' torn, v., 1881. 



VOL. II. M 



