1862.] M. O. A. L. MORCh's review of the VERMETIDiE. 53 



species referred to this genus, V. glomeratus, Biv., having a large 

 convex opercukim, is a Spiroglyphus ; and V. sub cane ellatus, Biv., is a 

 true Vermetus. The V. semisurrectus, Biv., with au " operculum fere 

 completura," seems not, according to the figure of Philippi, to differ 

 in the size of the operculum from the typical species. 



1. BivoNiA TRiQUETRA, Bivoua, 1832. 



T. solitaria aut gregaria, extus apicem versus saltern triquetra et 

 depressiuscula , orbiculatim vel turbinatim contorta, rugis trans- 

 versim flexuosis ; antice scepe elongata, cylindrica. 



T. ejusdem structures atque V. gigantis, sed multo minor ; diameter 

 tubi enim nunquam 2^ mill, excedit. Apex et interdum tola testa, 

 si solitaria, exquisite triquetra, basi adnata depressa ; pars testce 

 libera autem semper cylindricam formam induit. Rarius prater 

 carinam dorsalem, costce 2-3 adsunt ; plicee transversa; validae, 

 rugosce, irregulares, in parte cylindrica multo minus conspicuce. 

 Color albidus aut fuscescens. 



Animal operculo parvo, rudimentari, tentaculis superioribus cylin- 

 dricis, paululum retractilibus, inferioribus setaceis longissimis ; 

 nigrum, pallio flavescente ; aut albidum, luteo, violaceo vel badio 

 maculatum (Phil.). 



Massa qucedam formata ab aliis tubulis, SfC, Bonanni, ii. 20 E. 



Vermetus triqueter, Bivona, Nuov. Gen. 1832, p. 11 (Phil.); Phi- 

 lippi, Enum. i. p. 170. t. ix. f. 21, ii. p. 143 ; Siebold, Wirbellose 

 Thiere, p. 344. 2. 



Bivonia triquetra. Gray, Fig. iv. p. 82, t. 58. f. 4. 



Vermetus (^Aletes ?) triqueter, Morch, Journ. Conch, viii. 36. 



-Var. a. PiNNicoLA (Mus. reg.). 



T. irregulariter spiralis, lineis tribus longitudinalibus crenulatis 



(Gravenhorst). 

 Vermicularia granulata, Gravenh. Tergestina, 1831, p. 65. no. 5 

 (non Fabr.). 



On the large Pinna, Seba, Thes. iii. tab. 91. no. 1. 



Vermetus granulatus, Forbes, ^geean Report, p. 138, verisim. 



? Serpula rupestris, Risso, Eur. Mer. p. 204. no. 25 ? 



Var. /3. spiRORBis. 



T, solitaria, alba, cretacea, spirorbiformis, apertura soluta ,- carina 

 dorsali crenulata, varicibus arcuatis 1 vel 2 in anfr. penultimo ; 

 latere externo subperpendiculari, liris confertis obsoletissimis ; 

 striae incrementi irregulares, sigmoidece, scepe membranace(S, peri- 

 pheriam versus incrassatce, in locis occultis pulcherrime undulato- 

 squamulosce ; anfr. primi carnei. 



Diam. testse 19m.; diam. apertures 3f m. 



Hab. In littore Dalmatise (coll. Dunkeri in lapide). 



Var. y. Aletes. 



T. lateraliter affixa, anfr. obliquis decumbentibus planis ; carina 

 dorsalis compressa, crenulata, umbilicum approximans ; strice in- 



