stokes.] -^5 J [Sept. 16, 



Lagcnophrys patina, sp. nov. Fig. 19. 



Lorica nearly orbicular, much depressed, upper surface slightly coavex, 

 the lower plane ; aperture circular, terminating a short, nearly perpen- 

 dicular neck-like prolongation, surrounded by a thin, apparently mem- 

 branous, horizontally projecting border, its margin irregularly and 

 minutely crenulate. Diameter of lorica, ^i^ to ^i^ inch. Hah. — Pond 

 water ; attached to the legs and branchial appendages of Gammarus. 



In form and size this closely resembles L. ampulla Stein, but differs in 

 the absence of the everted and beaded rim projecting in front of the oral 

 aperture in the first-mentioned species. 



Histrio eretJiesHcus, sp. nov. Fig. 20. • 



Body subelliptical, less than three times as long as broad, both extremi- 

 ties rounded, the lateral borders flattened, nearly parallel ; lip semicircu- 

 lar ; peristome-field reaching to the centre of the ventral surface, the 

 right-hand margin bearing a membrane ; frontal styles nine, the three an- 

 terior ones largest, the three posterior smallest, setose, inconspicuous ; 

 ventral styles five, more or less clustered, two on the right-hand side 

 small, setose ; anal styles large, stout, usually rigid, only the second and 

 third on the right-hand side projecting beyond the posterior border ; mar- 

 ginal setie vminterrupted. Length of body, j-i^ inch. Hnh. — Shallow 

 pools, with Lermia and Algffi. 



The animalcule's movements during forward progression are constant 

 but not especially rapid, nor long extended in one direction, but it has a 

 most annoying habit of suddenly darting backward, for a distance seldom 

 exceeding its own length, yet as it is impossible to anticipate the direction 

 of this erratic movement, and as the change of position is extremely rapid, 

 the eye fails to adjust itself soon enough to keep the creature distinctly 

 visible. The Infusorian continues these backward leaps incessantly when 

 not swimming forward, consequently it is a difficult animalcule to study. 

 Occasionally, especially after long confinement, two contractile vesicles 

 become apparent, a small vacuole developing near the centre of the left- 

 hand margin of the peristome, in advance of the large normal vesicle. 



Solenophrya odontop>1iora, sp. nov. Fig. 21. 



Lorica cup- or bowl-shaped, membranous, hyaline, the height about 

 equal to the breadth, the posterior extremity rounded, the anterior border 

 beneath the even, circular margin bearing from four to twelve attenuate, 

 hollow, variously and inwardly curved, tooth-like processes ; enclosed 

 animalcule not adherent to the lorica ; endoplasm finely granular. Height 

 of the lorica including the processes, jjVj inch ; length of the tooth-like 

 processes, -^^sq inch. Rah. — Pond water ; attached to Myriophyllum. 



This form was first observed, and in considerable abundance, about four 

 years ago, but has not since been met with. All the inc^viduals then 



