192 BUCCINTJM. 



any specimens of ciliatum which I have seen. The form is much 

 like that of sericatum, Hanc., except that the whorls are inflated 

 and shouldered, and the suture canaliculate. Whorls seven. 



Length 1'36 in., width '8 in. ; length of aperture -66 in. 



Arctic Ocean, near Icy Cape. 



The above is Mr. Dall's description, who, moreover, appends 

 n. s. ? to the name. It is a very doubtful species, the canaliculate 

 suture being its only peculiar feature, and that would indicate its 

 pertinence to the genus Volutharpa. 



B. HUMPHREYSIANUM, Bennett. PL 76, figs. 343,344; PI. 77, 

 figs. 346-352 ; PI. 79, figs. 383, 385. 



Shell thin, subtranslucent or nearly opaque, pale brownish or 

 yellowish, sometimes mottled with fawn or reddish brown, or 

 irregularly banded with rows of spots or chain-like markings, 

 frequently without spots or mottlings ; sculpture numerous fine 

 close-set revolving lines ; 110 longitudinal ribs, or at most but 

 faint indications of them upon the spire-whorls ; periostraca 

 very thin, ciliated. Length, l'75-3'5 inches. 



Shetland Is. ; Ireland ; Norway ; American Arctic Ocean ; Banks 

 of Newfoundland ; Lapland ; Coast of Provence, France ; Sicily. 



Dr. Gwyn Jeffreys says that " Dr. Stimpson must have mis- 

 taken some other species (perhaps B. ciliatum) for. B. Hum- 

 phrey sianum when he described the latter as having a ciliated 

 epidermis ; and I therefore cannot recognize the North American 

 localities indicated by him. B. ventricosum of Kiener (from the 

 coast of Provence), is closely allied to our shell ; but the whorls 

 are more tumid and gibbous, and the operculum is not so dispro- 

 portionately small. They bear the same relation to each other as 

 Aporrhais Serresiana does to A. Macandrese. The operculum 

 bears the same proportion to the size of the mouth as that of 

 Aporrhais ; it seems to be more ornamental than useful, like the 

 coquettish hats worn by the girls of Tuscany on the crown of 

 their heads. The opercular lobe covers only the centre of the 

 operculum, the upper and under sides of which are sometimes 

 encrusted with sessile Foraminifera. The egg-cases are sepa- 

 rate and hemispherical. Some of the above characters are so 

 peculiar as perhaps to warrant the generic separation of B. 

 Humphreysianum, under the name of Mada, its surface being 

 glabrous." 



