JIELVILL : ON VARIATION IN OLTr.i OIBBOSA. 65 



The following is the synonymy : — 



Valuta gibbosa, Born, Test. Mus. Caes., p. 215, 



Oliva cingulata, Chemnitz, x, pp. 1369-70. 



Voltita utriculus, Ginelin, 8yst. Nat., p. 3441. 



Oliva utriculus (Gmel.), Lamk., Ann. du Mus., xvi, p. 323. 



Oliva gibbosa ;Born), Reeve, Conch. Icon., Oliva,^\. viii,figs. 12«-Zi. 



Anazola gibbosa, Gray, List of Mollusca Brit. Mus., 1865. 



Utriculina utriculus (Gmel.), Gray. 

 Placed by some authors in the genus OlivanciUaria, by others it is 

 considered an Agaronia. 



Three distinct varieties, in colour and marking, occur, which may 

 be characterized thus : — 



(a) Flavescens. — Shell of a pale stramineous or yellow hue, some- 

 times suffused with orange or fulvous, the mottled markings as in 

 the type. 



(b) Fulgurans. — Markings in zigzag longitudinal lines, the spaces 

 between clear and plain. I have never noticed this variation in the 

 typical livid-grey form. I fancy it may be restricted in its habitut 

 to the Philippines and other Eastern islands. It is figured in Reeve 

 (I.e., fig. 12^) as collected by the late Mr. Hugh Cuming. To the 

 type it bears much the same relationship as 0. intricata does to 

 0. nebiilosa, Lamk. 



(c) Candicans. — Mr. J. M. Williams, of Liverpool, whose collection 

 of the genus is probably the finest extant, possesses a pure albino 

 example, typical in form. It was procured in France, and, so far, is 

 unique. 



In addition to these, an extraordinary monstrosity of the typical 

 shell exists, in which the basal fasciole is reproduced across the centre 

 of the body-whorl, the result being very striking. About fourteen 

 years ago, in November, 1889, I exhibited the specimen from my 

 collection, now shown, at a meeting of the Manchester Literary and 

 Philosophical Society, and then proposed for it the name var. monstr. 

 mediocincta. Since then I have seen two other examples of the same 

 abnormality, but where I cannot now recollect, and Mr. G. B. 

 Sowerby has kindly allowed me to inspect a very large and fine 

 example, with the additional fasciole particularly well developed. 

 The example I have was formerly in the collection of Mr. John 

 Dennison, of Liverpool. It formed one of "20 Olivas, various," 

 sold at Stevens' Auction Rooms on April 24th, 1865, being lot 23 

 in the sale. Mr. F. P. Marrat, author of the monograph " 0//r«" in 

 Sowerby's Thes. Conch., catalogued this collection, and it is curious 

 he did not specially mention such a wonderful anomaly us is presented 

 by this specimen. 



Chneophila gibbosa, Gray (Proc. Zool. Soc, 1858, p. 48) = Olira 

 claneopkila, Duclos, Mon., t. xxix, fig. 89, must not be confounded with 

 the present shell under discussion, being a variety, in all probability, 

 of 0. auricidaria, Reeve, now included in OlivanciUaria. 



VOL. VI. — MAiicH, iyu4. 



