152 M. O. A. L. MORCh's REVIEW OF THE VERMETID^E. [April 9, 



Testa natalis {et juvenilis) lateraliter affixa j)lanorbiformis, anfr. 

 primi pulcherrime arcuatim gramilosi ; granulce in quadrata 

 dispositce. 



Var. BispiNOSA (PL XXV. figs. 9 & 10.), an sp. distincta? 



Operculum inferne conico-convexum ; seice spinis utrinque circ. 14 

 sape ternatis, calcar basale validissimum erectum [lamina 

 basalis deest ?) . 



Althougli this operculum is smaller than that of the preceding, 

 the basal spur of the bristles is much larger ; if this is not in con- 

 sequence of its being unworn, it may be a different species, especially 

 as it is nearly conic below. 



Hab. Realejo, on Callopoma saxosum, "Wood, and Crucibulum 

 scutellatum, Gray. On the latter shell the specimens affixed to the 

 light-coloured parts are white, and those affixed to the brown parts 

 brown ; having, however, seen this on one specimen only, I cannot 

 decide whether it is accidental. 



SiPHONiuM, Mrs. Gray, Figures of Moll. Anim. iv. p. 82. 



Siphoniam, " Browne," Morch, Joum. de Conch, vii. no. 4. p. 353. 



Stoa, M. de Serres, Annales des Sciences Nat. iv. 1855, p. 238, 



Ojierculum magnum, concavum vel infimdibuliforme, obsolete spi- 

 rale, inferne plerumque mammilla centrali. 



Patrick Browne comprehended under the generic name Siphonium 

 nearly all those different forms of "worm-tubes," which Linnaeus 

 afterwards included in his genus Serpula. The first species is thus 

 characterized in the ' Civil and Natural History of Jamaica,' *' Sub- 

 cequale angulatum et flexuosum." The second word very likely sig- 

 nifies triangular (triqueter), and by " fieocuosusj" is probably meant 

 creeping horizontally in bends, in opposition to " contorta," which 

 applies better to the Vermeti. It seems to me therefore likely that 

 the first and typical species is a Serpula. The fifth species is with- 

 out doubt Vermetus Knorrii, Desh., a form for which Lister pre- 

 viously had instituted the name Vermiculus. The only figured spe- 

 cies is a Teredo. I have adopted the name after Dr. Gray, as it does 

 not appear to have been used before. Siphonium, Link., is very 

 badly described in the ' Catalogue of the Rostok Collection,' iii. p. 9, 

 1807, thus : "Shell straight, with septa forming rings outside. Here 

 belong the straight Nautili. Siph. fasciatum is exactly like Nau- 

 tilus fascia, Gm., but larger." The species of Gmelin belongs to 

 the Foraminifera. 



M. de Serres has established a genus of " Annelides sedentaires 

 tubicoles," under the name Stoa, chiefly on account of their habit of 

 burrowing a bed in the surface of other shells, exactly corresponding 

 to the genus Spiroglyphus of Daudin. Both authors have mixed 

 together species of two very different genera, the one with a con- 

 cave, the other with a thick convex operculum ; but as Daudin has 

 selected for illustration of his genus a species with an operculum of 

 the latter kind, I regard the represented species as the type, although 



