722 ORDER PERITRICHA. 



annular constrictions across the centre ; pedicle varying in its proportions 

 from one-quarter to the same length as the lorica, produced usually to some 

 distance within the lorica, having frequently a button-like node or boss 

 immediately beneath its point of juncture with the lorica, this node, however, 

 often produced inside the lorica, or supplemented by a second boss-like 

 enlargement where the pedicle joins the animalcule's body. Length 1-570". 

 HAB. Salt water, on algae, &c. 



This form was first met with by the author at Bognor, Sussex, in the autumn 

 of the year 1872, and has been since obtained in great abundance from the Menai 

 Straits, North Wales, and has been also remitted by Mr. John Hood from Dundee. 

 The pedicle in most examples examined was produced a considerable way inside 

 the lorica, and the single boss developed at the base of this internal prolongation. 

 The surface of the animalcule, as seen with a magnifying power of 200 diameters, 

 was also distinctly striate transversely, after the manner of Cothurnia marina which 

 it closely resembles. Among the several modifications of this type reported by 

 C. Mereschkowsky from the White Sea, the one possessing a slender, rigid footstalk 

 equal in height to the lorica which it supports, is figured under the name of 

 C. nodosa var. longipes. 



Cothurnia compressa, C. & L. PL. XL. FIGS. 17 AND 18. 



Lorica transparent, ovate, three times as long as broad, compressed 

 anteriorly, so as to leave a long, narrow, slit-like terminal aperture ; 

 pedicle exceedingly short, supplemented by a boss-like inflation within the 

 interior of the carapace, to which the animalcule is attached. Length of 

 lorica 1-178". HAB. Salt water, on seaweeds and Bryozoa. 



The author met with this well-marked variety attached to seaweeds and 

 zoophytes gathered in the vicinity of St. Peter's Port, Guernsey, in the autumn of 

 the year 1871. The animalcules were in all instances a pale amber colour, the 

 anterior or peristome region being widely dilated, so as to give it a trumpet shape 

 when expanded, while the cilia were very long and powerful. Claparede and 

 Lachmann's figures, here reproduced, represent the species in its contracted or semi- 

 contracted conditions only. 



Cothurnia ovata, Duj. 



Lorica transparent, ovate, very short, scarcely one and a half times 

 as long as broad, truncate and slightly dilated at the aperture ; pedicle 

 short and stout. Animalcules trumpet-shaped when expanded, protrusible 

 to a considerable distance beyond the. aperture of the lorica. Length of 

 lorica 1-200". 



HAB. Fresh water, on Conferva and other aquatic plants. 



This species may be distinguished from Cothurnia imberbis, with which it is most 

 likely to be confounded, by the much shorter and more truncate contour of the 

 lorica and by the capacity of the contained zooid to protrude to a longer distance 

 beyond the orifice of its domicile. 



Cothurnia patula, From. PL. XL. FIGS. 20 AND 21. 

 Lorica transparent, cup-shaped, very short and broad, the breadth 

 slightly exceeding the length, the anterior margin conspicuously everted ; 

 pedicle short and stout ; animalcules trumpet-shaped when expanded, pro- 



