1862.] M.0.A.L. MORCH’S REVIEW OF THE VERMETID&. 55 
species referred to this genus, V. glomeratus, Biv., having a large 
convex operculum, is a Spiroglyphus; and V. subcancellatus, Biv., is a 
true Vermetus. The V. semisurrectus, Biv., with an “ operculum fere 
completum,”’ seems not, according to the figure of Philippi, to differ 
in the size of the operculum from the typical species. 
1. Brvontra TRIQUETRA, Bivona, 1832. 
T. solitaria aut gregaria, extus apicem versus saltem triquetra et 
depressiuscula, orbiculatim vel turbinatim contorta, rugis trans- 
versim flexuosis ; antice sepe elongata, cylindrica. 
T. ejusdem structure atque V. gigantis, sed multo minor ; diameter 
_tubi enim nunquam 25 mill. excedit. Apex et interdum tota testa, 
si solitaria, exquisite triquetra, basi adnata depressa; pars teste 
libera autem semper cylindricam formam induit. Rarius preter 
carinam dorsalem, coste 2-3 adsunt ; plice transverse valide, 
rugose, irregulares, in parte cylindrica multo minus conspicue. 
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 quedam formata ab aliis tubulis, &c., 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, Hgzean Report, p. 138, verisim. 
? Serpula rupestris, Risso, Eur. Mér. 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 ; 
stri@ incrementi irregulares, sigmoidee, sepe membranacee, peri- 
pheriam versus incrassate, in locis occultis pulcherrime undulato- 
_  squamulose ; anfr. primi carnei. 
_ Diam. teste 19 m.; diam. aperture 32 m, 
Hab. In littore Dalmatiz (coll. Dunkeri in lapide). 
Var. y. ALETES. 
T. lateraliter affixa, anfr. obliquis decumbentibus planis ; carina 
dorsalis compressa, crenulata, umbilicum approximans ; strie in-. 
