GENUS LAGENOECA. 359 



Salpingoeca Boltoni, S. K. 



Lorica pedunculate, elongate-conical, the anterior border widest, slightly 

 everted, tapering and acuminately pointed posteriorly, from two to two 

 and a half times as long as broad ; pedicle straight and slender, equalling 

 or exceeding twice the length of the lorica ; enclosed animalcule symme- 

 trically ovate or subcylindrical, occupying one-half of the cavity of the 

 lorica, sometimes affixed to it by a thread-like prolongation of the posterior 

 region of the body. Length of lorica 1-1250", of contained zooid 1-2500". 



HAB. Fresh water, solitary. 



This species represents the first-fruits of the more extended acquaintanceship 

 with this interesting order of the Flagellata acquired through the publication of 

 the plates illustrative of all the previously known forms, in the first part of this 

 Manual, in October 1880. Its discovery is due to Mr. Thomas Bolton, who having 

 detected it attached to Myriophyllum from his aquaria, failed to identify it precisely 

 with any of the species figured in Plates II. to X. of this treatise, and remitted 

 examples to the author. So far as the external contour of the lorica, and the pro- 

 portionate length of the supporting pedicle are concerned, it most nearly resembles 

 the marine Salpingoeca inquillata, represented at PI. VI. Figs. 1-6. Apart from its 

 fresh-water habitat, it may be distinguished from that type, however, by its con- 

 siderably larger size and the greater proportionate length of the pedicle, which is 

 surpassed by that alone of ,5. longipes, 



A few weeks previous to Mr. Bolton's independent discovery of this species 

 (September 1880) the author met with examples undoubtedly referable to the same 

 type on vegetable debris derived from the Victoria regia tank in Kew Gardens, and 

 it has since propagated abundantly in a window aquarium containing Aponogeton, 

 Myriophyllum, Ceratophyllum, and other aquatic plants in a vigorous state of growth. 

 On one occasion an example was observed in which the animalcule was attached to 

 the side of its lorica by a contractile thread-like prolongation of the sarcode of its 

 posterior region, in a manner resembling that already described of Salpingoeca cornu- 

 tum. A rough delineation of this species is contained, at letter c, in the pen-and- 

 ink sketch executed by the author for Mr. Bolton, included in his advertisement 

 to subscribers bound up with Part II. of the Manual, published in November 1880, 

 this sketch being further reproduced as a lithographic plate in Part I. of the ' Northern 

 Microscopist,' announced for January 1881. No fitter illustration of the abundant 

 distribution of the Flagellate Infusoria can perhaps be cited than the drawing just 

 referred to, in which no less than three varieties of collared monads and two 

 sedentary Pantostomatous species are, as observed by the author, grouped upon a 

 small portion of a leaflet of Myriophyllum spicatum. 



GENUS II. LAGENCECA, S. K. 



(Greek, lagenos, flask ; oikeo, to inhabit.) 



Solitary, collar-bearing, flagellate animalcules, resembling those of 

 Salpingoeca, but secreting and inhabiting a freely detached protective sheath 

 or lorica. 



The members of this genus, of which but a single species has as yet been dis- 

 covered, may be said to occupy that position with reference to the more ordinary 

 stationary Choanophorous Flagellata that is held by the higher Ciliata Dictyocysta or 

 Tintinnus with relation to the sedentary representatives of the primary groups to 

 which they respectively belong. 



