RISSOA. 357 



R. discrepans, Brown, mentioned in the ' British Mollusca/ 

 vol. iii. p. 101, the first figured pi. 82. f. 3, and the latter, 

 pi. 76. f. 2. are mere varieties of this most polymorphous 

 species. 



We take this opportunity to remark, that there are a 

 number of minute apocryphal objects, termed Turbo and 

 Helix, &c., recorded by Montagu, Turton, Adams, Walker, 

 and Brown, which, from the wretched figures and meagre 

 descriptions, defy definition and identification. They are 

 probably the pulli of other species, and may with equal pro- 

 priety be consigned to ten as to one parent. They are only 

 alluded to in the ' British Mollusca/ for future possible refer- 

 ence; it would be lost labour to notice them farther, and 

 we trust that the time is passed for the infliction of such 

 descriptions and delineations of objects of natural history. 



R. FULGIDA, Adams. 

 R.fulgida, Brit. Moll. iii. p. 128, pi. 81. f. 1, 2, and- p. 169. 



Animal inhabiting the most minute of the British ris- 

 soidean shells, of four tumid volutions, marked on the basal 

 and antepenultimate ones with two dull red-brown and two 

 light yellow bands, arranged alternately. Aperture nearly 

 orbicular ; outer edge thin, without a callous pad, and with a 

 subperforated columella; axis -o^th, diameter -jVtli of an 

 inch. Mantle yellow, even with the aperture, and without the 

 pendant filament at the upper angle. Rostrum short, not 

 corrugated, flat at the extremity, vertically cloven above and 

 below ; disk pale yellow, with a fine dirty-brown line marking 

 the fissure. The usual buccal apparatus can be seen in 

 action. Tentacula moderately long, strong, divergent, rounded 

 at the ends, and under high powers slightly setose ; they are 

 not much vibrated on the march, of a pale yellowish- white 

 hue ; eyes large, at their external bases, on slight protruding 

 inflations. Foot not very short, nor proportionately so narrow 

 as in the typical Rissoae ; rounded in front, slightly labiated, 

 and constricted anteally, but not auricled ; also rounded 

 behind, having a medial longitudinal line on the posterior 

 half; colour above yello wish- white ; below, confused flake- 



