490 



canaliculata would, however, have been peculiarly appropriate, as it 

 specifies an essential and distinctive feature of the species. Although 

 generally accepted, of late, as the olearium of Linnseus, it was 

 deficient, as Eruguiere remarked, in the very important character of 

 an interstitial costella between the belts. The Biiccinum olearium 

 of Dillwyn seems an attempt to unite the delineated features of this 

 shell with the Linnean definition. Kiener's figiu-es, if designed for 

 this species, are by no means characteristic. The engraving of D. 

 olearium in the 'Encyclopedic Methodique' (pi. 403, f. 1) does not 

 sufl&ciently exhibit the canaliculated sutures ; yet can scarcely be 

 intended for the allied deshayesii. 



Reeve has figured in his * Iconica ' a very beautiful, but unusual 

 variety, which I take to be the D. plumatum of Green, — a species 

 which has indeed been referred to perdix, but whose described suture 

 harmonises far better with that of the present Bolium ; his reference 

 to Seba (pi. 63. f. 18, instead of pi. 68. f. 16) was clearly a misprint. 

 Green's description of D. oleat'ium reminds us more oi galea than 

 of cepa. 



DOLIUM DESHAYESII, RcCVe. 



Bolium perdix, in part. Martini, Conch. Cab. iii. f. 1080, probably. 



Bolium olearium, Sowerby, Genera Shells j Reeve, Conch. System, 

 pi. 264. f. 1. 



Bolium Beshayesii, Reeve, Conch. Icon. Dol. f. 15. 



There is a painting in Knorr (Del. pt. 5. pi. 12. f. 1) which may 

 perhaps have been intended for this scarce shell. A rather irregular 

 malleation aids us in distinguishing it from B. cepa. 



DoLiuM FAVANNEi, Haulcy, Proc. Zool. Soc. 1859. 



DoLiuM DUNKERi, Haulcy, Proc. Zool. Soc. 1859. 



DoLiuM VARIEGATUM, Lamarck. 



Bolium variegatuw., Lamarck, Anim. s. Vert. ; Kienei*, Coq. Viv. 

 Dol. pi. 2. f. 3 (not 3 a) ; Reeve, Conch. Icon. Dol. f. 7 a. Not of 

 Philippi. 



Bolium Kieneri, Philippi, Neue Conch, iii. p. 36, for Kiener, as 

 cited. 



Lamarck appears to have described the species from a young or 

 dwarf example of the short-spired form. In fine characteristic 

 specimens the shape is subglobose, and the basal or anterior decli- 

 nation abrupt ; the suture is channelled ; the spire not much raised, 

 and the throat orange. A spiral riblet runs between the ribs upon 

 the spire, and between the posterior ones of the eighteen or twenty 

 which encircle the body. 



In the younger specimens the suture is not so deeply channelled, 

 the belts are rounder and narrower in proportion, and more of them 

 are spotted. 



In the variety tankervillii (the B. variegatum of the Tankerville 

 collection, now in my own possession) the spire is peculiarly depressed. 



