66 THE NAUTILUS. 



dark fulvous and melanic forms of vidua. Small, dark forms, on 

 the other hand, are often very close to specimens referable to fune- 

 bralis Lam. 0. tricolor Lam. seems to be a good species, and not a 

 variety of elegans. 



OLIVA FUNEBRALIS Lamarck. 



This species seem to occupy an intermediate position between 

 tigrina and elegans. It is beautifully illustrated by Marrat (Thes. 

 Conch., pi. 11, figs. 143-148) under the names of " leucostoma " 

 Duel, and " labradorensis " Bolten. The figure cited by Bolten in 

 Lister, tab. 731, fig. 20. is unrecognizable, so that labradorensis can 

 fortunately be dropped. The narrower form suggests a probable 

 relationship to the narrow, cylindrical mustelina Lam., while the 

 broader form shows a tendency towards the more inflated dactyliola 

 Duel. 



OLIVA DACTYLIOLA Duclos. 



This seems to hold an intermediate position between funebralis and 

 bulbiformis, having the spire of the former and outline of the latter. 



OLIVA BULBIFORMIS Duclos. 



This species is distinguished from the preceding in having a much 

 smaller spire usually entirely covered by a callus. Oliva similis 

 Marr., is evidently a variety without the callus spire. This species 

 seems to naturally lead to the small callus-spired species, such as 

 mucronata Marr., lepida Duel., todosina Duel., carneola Gmel., 

 tessellata Lam., etc. 



OLIVA CARNEOLA Gmelin. 



There are entirely or partially mottled specimens of this species 

 which seem to connect lepida and todosina with this species. 



OLIVA MUSTELINA Duclos. 



The deep suture and cylindrical form, often noticeably narrower 

 towards the anterior, suggest an approach to scripta. Specimens 

 with interrupted revolving bands constitute the var. angustata 

 Marr. 0. athenia Duel., resembles this species in miniature. 



OLIVA SCRIPTA Lamarck. 



The suture is deep and wide. The color markings resemble 

 0. litter ata Lam. 



