MELICERTAD.E. 77 



JFv. Tatem (loc. cit.) described and figurod a tiibe-maldng rioUferoii, somcwliat 

 resembling a Linmias, with long curved antemife. If the bi-lobed condition of the 

 trochal disk (as given in his figure) were permanent, and if there were also an obvious 

 dorsal gap in the ciliary wreath, this would be a species of the genus. Unfortunately 

 Mr. Tatem's description does not make this point clear, and in other respects the animal 

 resembles QJcistes longlcornis. 



L. ANNULATUS, Bciilcy. 

 (PI. VI. fig. 2.) 

 Limnias annulatus . . . . Cubitt, Mon. Micr. J. vol. vi. 1871, p. 105, pi. xcviii. 



SP. CH. Five horny processes on the dorsal surface below tlie corona ; ventral 

 antennae moderately long ; tube cylindrical, smooth, transparent, and crossed by trans- 

 verse ridges, at regular intervals. 



I have met with this Limnias but once, and then had no time to study it. It 

 appears to be rare in England, though Mr. Ciibitt (from whose paper, cited above, the 

 following particulars are taken) found it in abundance in a tributary of the Northbourne 

 P.rook. Kent. 



Its tube is remarkable. In young adult specimens it is perfectly transparent, with a 

 brilliant orange tint which at the sides becomes a deep carmine, owing to the greater 

 thickness of tube which we there look through. Fine transverse ridges, one-ten- 

 thousandth of an inch apart, surround the tube from top to bottom. These are possibly 

 caused by the pressure against the case of two horny processes (figs 2b, 2d, hp) 

 on the dorsal surface. These, under dark-field illumination, show a bright red spot 

 at the top. Three less prominent processes lie in a line below the first two ; the distance 

 between the rings is precisely that between these two rows, so that possibly they may 

 help to form and gauge them. 



The foot is long, wrinkled, with distinct muscles. When the animal contracts itself 

 into the case it folds the foot as shown in fig. 2a ; a jslan also adopted at times by L. 

 ceratojjjnjlli. 



Length, ^'j inch ; Scotch specimens, -,L i)ich. Habitat. Witlingham, Norwich 

 (Brightwell); Kent (Cubitt) ; Forfar (.I.H.) : rare. 



Genus CEPHALOSIPHON, Ehrcnberg. 



GEN. CII. Corona nearly circular ; AoTsa.1 ga.^^ distinct ; dorsal a.iiteima, obvious ; 

 ventral antennae absent ' ; tiro dorsal hooks enclosing the dorsal antenna. 



C. LIMNIAS, Ehrenberg. 



(PI. YI. fig. 3.) 



Ccpluihsiphon Limnias . . . Ehrenberg, Verlmiidl. der Berlin Akad. 1853, p. 193. 



„ ,, . . . Pritchard, Infusoria, 1801, p. G70. 



Limnias ceratophylli . . . Slack, Marvels of Pond Life, ISGl, -p. Ii9, Vfith 6g. 



C eplmlosiphon Limnias ... ,, Intellcclual Observer, vol. i. 1862, p. 53, figs. 1, 2. 



„ ,, . . . Gosse, Intellecbtal Observer, vol. i. 1S02, p. id, wiih y>}a.te. 



Melicerta Ceplmlosiplion ... „ Popular Sci. Rev. vol. i. 18(;2, p. 490. 



„ ,, . . . Tatem, J. Qtiekett Micr. Club, vol. i. 18G8, p. 124, 



pi. vi. figs. G, 7. 



,. „ . . . Cubitt, il/oK. il/tcr./. vol. v. 1871,p. 170, pi. ixxxi. figs. 1,2. 



,, ,, . . . Hudson, Jl/o«. ilffcr./. vol. xiv. 1875, p. 1G5, pi. cxvii. fig. 1. 



SP. CH. Dorsal antenna very long ; tube tapering to the foot, compact, strengthened 

 with extraneous material. 



' I tliouglit once that I caught sight of a minute setigerous ventrally placed pimple in C. Limnias ; 

 there may possibly be a pair of such ventral antenna;. 



