1861.] M. O. A. L. MORCh's review of the VERMETIDjE. 333 



Sect. A. Operculum, inferne mammilla eentrali abbreviato-conica, 

 vertice obtuso. 



Bivonia, Adams, Genera; Gray, Guide, not Cat. 1842. 



9. Spiroglyphus glomeratus, Bivona, 1832. 



V. testis cylindricis aut subangulatis, eontortis, in massam con- 

 glomeratis, transversim undulato-rugosis. 



Operculum completum, convexum semiglobosum, rufum sujierne 

 cinereum, rugosum, secundum Bivonam spiratum, anfractibus 

 laminosis tenuibus numerosissimis confertis ; subtus medio con- 

 cavum, margine nitidissimo Icevissimo libero (Phil.). 



Animal viridi-fuscum, cinereo et nigro punctatum et maculatum, 

 interdum strigis atro-purpureis duabus in dorso ; area inter 

 tentacula anteriora et pedem alba (Phil.). 



Diam. ap. vix. 2'". 



Vermetus glomeratus, Bivona, Nuovi Genere e Nuovi Sp. p. 12, 

 t. .5. f. 5 (Phil.). 



V. glomeratus, Phil. Enum. i. p. 171, t. 9. f. 23 ; ii. p. 144. 



Bivonia glomerata, Gray, Fig. of Moll. i. t. 188. f. 5 ; iv. p. 49. 



B. glofnerata, Adams, Genera, i. p. 358, t. 39. f. 1 (copy), f. a-c 

 (original). 



B. glomerata, Miirch, Journ. Conch, viii. p. 361. 



Hab. Praesertim prope Panormum frequenter occurrit {Phil.). 



The description of the operculum is very incomplete, the central 

 mammilla being overlooked. I have not seen any operculum nearly 

 hemispherical, as represented ; but I do not doubt, from analogy with 

 the other species, that it is occasionally found. 



Var. a. crustans. 



1 Le Gateau des Vermisseaux, Fav. t. 8. f. Q, from Provence. 

 Das graue und hraune Wurmgewdchs, Kmidm. Rariora, 1737, 

 p. 164, t. 10. f. 3. 



Bivonia glomerata, Adams, Gen. t. 39. f. 1 a, b, c. 



T. agglomerata crassa, laxe spiraliter torta ; anfr. primi teretes 

 Icevigati, candidi /undo cinereo, sulcis concentricis subremotis 

 articulatim adstricti ; anfr. ultimus fuscescens, carina laterali 

 acuta, latere externa subperpendiculari rudi, latere interno de- 

 clivi, laminis incrementi leviter arcuatis irregularibus approxi- 

 matis ; apertura circularis obliqua, diam. 5 m. ; dissepimenta 

 convexa v. cupuliformia, cretacea. Testajuvenilis corrodens pla- 

 norbiformis badia, anfractibus angustis angulo laterali obtuso. 



Operculum atro-purpureum crassum coriaceum planiusculum, su- 

 perne laminis brevibus concentricis irregularibus, area eentrali 

 lata convexa; inferne area musculari excavata opaca atra, 

 concentrice lirata, nodo eentrali co7iico-convexo rufo ; limbus 

 nitidus bipartitus ; zona interna convexa atra, externa coccinea 

 tenuis oblique conferte striata, margine subrefiexo. 



Diam. fere 4 m. 



