TEREBELLUM. 



of only two or three volutions : the apex of its aperture m 

 continued in the form of a very narrow spiral canal, sepa- 

 rating- the volutions. Next to this we should place the 

 species named T. fusiforme^ in " Sowerby's Mineral Con- 

 chology, t. 287, (which, however, is not the same as 

 Lamarck's T. fiisiforme^) this, instead of the spiral canal 

 above mentioned, has the apex of its aperture continued 

 in the form of a straight narrow canal, extending rather 

 more than half way towards the apex of the shell : this 

 we consider as intermediate, in point of peculiar specific 

 character, between the T. suhulaium and T. corrcoluium^ 

 in which last species the spire is generally quite hidden, 

 (sometimes slightly apparent, and then having a spiral 

 canal separating the volutions.) but this w e conceive to l>e 

 effected by a continuation of the upper part of the whorls 

 covering the spiral line ^ because, if a specimen be broken 

 so as to expose the inside, the spiral line is there very 

 distinct, which fact is also demonstrative evidence, that 

 Lamarck's T. fusiforme is only a cast of the inside of 

 T. convolutum. 



We think we have thus shown the impropriety of 

 following Montfort, by adopting his Genus Seraphs ; the 

 Terehellmn fusiforme forms so natural a connecting* link 

 between the T. suhulaium and T, convolutuin^ that if we 

 adopt his Genus Seraphs, we should be under the absolute 

 necessity of separating T. fusiforme under a new generic 

 appellation, which we think would not at all further the 

 interests of concliological science. 



The animal of this Genus is not known, it is an inha- 

 bitant of the Indian Ocean. Lamarck thinks the shell 

 nearly related to the Ancillts^ the Olivce and the Coni^ but 

 the smooth and truncated Columella distinguishes it from 

 all three : it cannot be confounded with the Cypraeae in 

 their young state. 



Besides two varieties of T. suhulaium^ we have given 

 one view of T. fusiforme^ to shew the canal into which the 

 upper end of the aperture is produced; and a front view 

 of a specimen of T. convolutmtij the type of Moutfort's 

 Genus Seraphs. 



Fig. 1. 2. Terebellum subulatum. 



2. fusiforme. 



4, — convolutuin. 



