CADULUS-GADILA. 187 



Our figures and description are from specimens in the Jeffreys 

 collection (U. S. Nat. Mus.) which agree thoroughly with Montagu's 

 figures, and which perhaps came originally from Humphrey's stock 

 of shells. The species is quite distinct in its flask-like form, being 

 conspicuously and evenly swollen but not in the least angulated 

 anteriorly, and a good deal attenuated posteriorly. This peculiar 

 and characteristic shape is for some reason more conspicuous in the 

 shells themselves or in a natural size figure, than it is in the much 

 enlarged camera drawings, although the latter are faithful in pro- 

 portions. Jeffreys writes as follows : " C. gadus of Montagu resem- 

 bles C. olivi; but it is not only very much smaller, but is proportion- 

 ally shorter and less slender, and the anterior end is more con- 

 tracted. The locality given by Montagu (' many parts of the Brit- 

 ish Channel '), with the mariner's name * Hake's- tooth,' is at least 

 very doubtful as regards this species ; and it is not unlikely that he 

 may have mistaken for the ' Hake's-tooth ' Ditrypa arietina (a testa- 

 ceous annelid), which is frequently found adhering to the grease or 

 * arming' of the deep-sea lead in soundings. But his description 

 and figure evidently apply to a species of Cadulus from the noted 

 collection of old George Humphreys, the shell-dealer, of which I 

 possess specimens. This species was dredged by the late Professor 

 Barrett at Jamaica; and it is a fossil of the Sicilian tertiaries. I 

 received specimens of the latter from the Marquis di Monterosato as 

 ' Cadulus subfusiformis Sars,' and from Dr. Tiberi as ' Siphonoden- 

 talium olivi var. minor Scacc.' " 



The typical shells figured are without habitat. Whether the 

 localities "Jamaica" and "Sicilian Tertiaries" really refer to the 

 same specific form is open to question. Mr. A. H. Cooke reports 

 C. gadus from the Gulf of Suez, dredged by Mac Andrew ; and 

 Melvill and Abercrombie include it in their Bombay list. It is 

 evident that some of these localities are questionable ; and the true 

 habitat remains to be ascertained. 



C. gadus has been identified by Sacco (Moll. Terr. Terz. Piern. e 

 Ligur., xxii, 116) from the northern Italian Miocene; but his fig- 

 ure proves the identification incorrect. 



Montagu gives the following description ; and his figures are 

 copied on my plate (fig. 27) ; the latter are characteristic, though 

 the enlarged view is somewhat exaggerated. 



" Dentalium with a subpellucid, subarcuated shell, tapering to a 

 small point, pervious contracting a little towards the larger end ; is 



