GENUS LAGENOPHRYS. 733 



GENUS XIX. LAGENOPHRYS, Stein. 



Loricae ovate or pyriform, adnate or laterally attached, with a small, 

 contracted, and often valvular anterior aperture ; animalcules irregularly 

 ovate, occupying the anterior region of the lorica, and adherent throughout 

 the peristomal region to the margin of the aperture ; ciliary disc laterally 

 attached, separately stalked as in Opercularia, protrusible to a consider- 

 able distance beyond the aperture of the lorica, the free edges of the peri- 

 stome usually produced around the base of the extended disc in the form 

 of a membranous frill or collar ; the remainder of the oral system, endoplast, 

 and contractile vesicle as in all ordinary Vorticellidae. Increasing within 

 the cavity of the lorica by oblique fission or gemmation. Inhabiting fresh 

 water ; mostly ectoparasitic or commensal. 



The animalcules of this genus exhibit in the lateral attachment of their ciliary 

 disc and membranous collar a close affinity with the genera Opercularia and Pyxidium. 

 Lagenophrys may further be accepted as connecting the loricate and illoricate Vorti- 

 cellan groups, the more indurated cuticle of certain representatives of the genus 

 Opercularia, as already shown, frequently remaining in a loricate form after the decay 

 of the internal body-substance. The species so far discovered are all inhabitants 

 of fresh water, and are to be found attached to Entomostraca and other aquatic 

 animals. 



Lagenophrys vaginicola, Stein. PL. XL. FIGS. 36-38. 



Lorica elongate, cordate, having at its broader anterior end a circular 

 aperture with two even, semicircular, prominent, valvular or lip-like pro- 

 cesses, which are raised or depressed when the enclosed animalcule protrudes 

 or retracts itself ; enclosed animalcule ovate, adherent by its narrow peri- 

 stome to the orifice of the lorica. Length of lorica 1-380", greatest width 

 1-640". HAB. Fresh water, attached to Canthocamptus minutus. 



The author has frequently obtained this species attached to the caudal hairs 

 of the above-named Entomostracon. 



Lagenophrys ampulla, Stein. PL. XL. FIGS. 44-46. 



Lorica depressed, nearly orbicular, resembling a plano-convex circular 

 lens, but having an anterior, projecting, everted rim in front of the oral 

 aperture, this projecting rim ornamented with a moniliform pattern ; animal- 

 cule similar in form to the sheath. Diameter of sheath 1-480" to 1-360". 



HAB. Fresh water, attached to the branchial appendages of Gammarus 

 pulex and Asellus aquations. 



Lagenophrys nassa, Stein. PL. XL. FIG. 47. 



Lorica nearly spherical, plano-convex as seen in profile and emarginate 

 at the anterior or oral extremity; mouth of the lorica prolonged at its 

 margin into a subcylindrical, flexible, longitudinally plicate and toothed 

 lip-like extension, which, when closed on the retreat of the animal, some- 



