1892] 



THE BRITISH NATURALIST. 



127 



testae et ad partem medianam ultimi anfractus evanescentibus exarata, 

 atque liris remotis distantibus perdistinctis (circa 8-10 perspicuis) in 

 regione umbilici adornata, zona unica infra peripheriani castanea 

 angustaque cincta, fusca, violaceo tincta, ad apicem et partem inferam 

 paulo dilutior et supra infraque vittam ultimi carneo-fulva. Spira 

 conico-elevata ; anfractus 5, rotundati, sutura profunda; ultimus 

 ventricosus, perconvexus, antice longe et parum conspicue deflexius- 

 culus. Apertura fere circularis, breviter adnata, paulum obliqua, 

 superne vix subangulata. Peristoma continuum, simplex, ad 

 columellam tantum subpatulum. — Operculum? (verisimiliter normale). 



Diam. maj. 19, min. 16, alt. 19; apert. long. 10 mill., lat 9. 



Found by some French Missionaries in the vicinity of Lake 

 Tanganyika. 



This fine shell is allied to C. anceps, v. Martens, from Ukamba; 

 it differs by its stature, darker colour Avhich is even dissimilar, the 

 number of its whorls, the straight zone of the last one, and chiefly the 

 sculpturing of the umbilicus vv^hich is formed by distant prominent 

 lirae, the first one being the most developed. 



Notes. 



RissoA PARVA, DaC. — Two or three months ago I quoted the 

 brown or chocolate variety of this species as var. nigra, Norman, 

 according to the privately printed catalogue of Canon Norman's 

 collection (1888). Mr. T. D. A. Cockerell has just called my attention 

 to his var. lurida in the "Quarterly Journal of Conchology," 1887, p. 

 151, which is identical v/ith var. nigva, Norman, and has priority. I 

 find, however, that these names are antedated by MM. Bucquoy, 

 Dautzenberg, and Dollfus, in their " Mollusques Marins du 

 Roussillon," Vol. I., 274, where the form is described as var. (ex 

 colore) fusca. I should mention that the work referred to is being 

 published in parts, and that the 8th "fascicule" containing this 

 variety appeared in September, 1884. — B. Tomlin, Llandaff. 



Notes on Varieties. — The remarks made by me in former notes 

 are strongly confirmed in a paper by M. Collin, published in the 

 "Memoires of the Societe Malacologique de Belgique." This paper 

 was written twenty years ago, and treats of L. stagiialis. A few 

 experiments on breeding are given, and the conclusions arrived at are 

 identical with my own. The author found a considerable number of 

 examples having the animal of a bright golden or orange-yellow colour, 

 "d'un beau jaune d'or, pres(iue jaune orange." A number of these he 

 transferred to his aquarium; under the altered conditions the colour of 

 the young was, to a certain extent, similar to that of the parents, 

 ' Generalement elle tend a perdre peu a peu sa brillante couleur d'or 



