1862.] M. O. A. L. MORCH's review of the VERMETIDiE. 57 



2. BivoNiA SEMisuRRECTA, Bivona, 1832. 



T. solitaria, cylindrica, ajoice contorto, rugosa, adnata, antice 

 longe porrecta, varicosa, scejpe striis longitudinalibus subgra- 

 nosis asperula. 



T. minus vitrea, tenuior, facilius quam reliqttce cum Serpulee testa 

 confundi potest, prcesei'tim cum sculptwa plerumque obsoleta, 

 aut propter crustam calcaream non conspicua sit. 



Diam. tubi variata 2-4'". 



Plerumque apex tantum adnatus ; et pars antica, scepe usque ad 

 4" longa, libera est, scepe Icevissima. Varices manicceformes 

 hcec species frequentius osfendit quam reliquce ; coloretn semper 

 album vidi (Phil.). 



Animal operculo fere complete, tentaculis omnibus retractilibus, 

 superioribus cylind^'icis, inferioribus longioribus subulatis ; 

 caput et pedem fulva punctis azruleo-fuscis marmorata, collare 

 fidviim cceruleo-fusco articulatum ostendit, semel ego anteriorem 

 animalis partem pulchre cinnabarinam punctis albis adspersam, 

 et punctis nigris circa opercidum ornatam, collare autem cin- 

 nabarinum nigro articulatum vidi. Tentacula inferiora subvert 

 rucosa, intus longitudinaliter subsidcata (Philippi). 



Vermetus semisurrectus, Bivona, Nuov. Gen. p, 10, t. 2. f . 3 ; 

 Philippi, Enum. p. 171, t. 9. f. 1911, p. 144 ; vix Lacaze Duth. 



Bivonia semisurrecta, Gray, Figs. p. 28, t. 58. f. 1 ; Adams, 

 Genera, p. 358. 



Vermetus (Aletesl) semisurrectus, Morch, Journ. Conch. viii. p. 39. 



Hab. In mari Mediterraneo (Sicilia) frequens plerumque testaceis, 

 rarius scopulis adnata (Philippi). 



Dr. Hornbeck has received a specimen of this species attached to 

 Murex branderis, L., from M. Bivona, jun., which agrees perfectly 

 with the above description ; but the median lira on the penultimate 

 whorl is a little more prominent than in the others. In the Museum 

 of Breslau is a specimen of nearly twice the diameter of Philippi' s, 

 represented pi. 9. f. 19, and which yet appears to be the same species. 

 I believe this species is only the adult state of the preceding. The 

 chief differences are afforded by the animal ; in the present species 

 all the tentacula are stated to be retractile, whilst in the preceding 

 species only the superior are a little retractile ; but these observations 

 are probably not founded on very exact investigations. The brim 

 of the mantle is simple, not reflected as in B. triquetra ; but this 

 character is very likely only momentary. The colours are very dif- 

 ferent, but seem not to be constant, and are subject to great variations. 

 In the first volume of ' Enumeratio,' Philippi describes the lid thus 

 — " Operculum fere completum ; " but in the second volume — 

 *' Operculum completum, tenue, planum." Philippi's representa- 

 tions of the two species seem to me to show the opercula of the same 

 size in proportion to the lumen of the tubes. The animal represented 

 by Lacaze Duthiers as V. semisun'ectus seems not to have any lid ; 

 I suppose, therefore, it is V. gigas, Biv. 



