1861.] M. O. A. L. MORCh's REVIEW OF THE VERMETIDjE. 345 



Var. ft. FAVOSA (Thylacodus). 



T. lateraliter affixa, irregulariter spiralis, cerea ; anfr. graciles in- 

 terdum soluti, teretes, scepe contigui vel tecti, hie illic varicibus 

 bremssimis arcuatis erectis, superficie lonyitudinaliter seriatim 

 pulcherrime favosa ; focecB plerumque hexagoncB e liris longitu- 

 dinalibus confer te regulariter undulatis et rug is cequalibus 

 transversis eequidistantibtis formatis : anfr. primi graciliores, 

 IcEviuscuU, castanei. 



Diam. aperturte 2| m. 



Hab. California, on Crucibulum {Mus. Cuming). 



The surface of this shell is quite like that of a honeycomb. The 

 two pair of sides of the hexagonal holes are formed by the undula- 

 tion of the longitudinal lirae ; the third pair is formed by transverse 

 rugse, exactly of the same size and form as the longitudinal lirae. 

 Longitudinally the rows are quite regular, transversely the rows are 

 oblique, or rather irregular. It is perhaps somewhat corroding. The 

 sculpture and colour look so different from the type that it jjerhaps 

 will prove to be a distinct species ; but some parts show the same 

 dark-brown colour as in the type, and the first whorls are very like 

 those of the following variety, which I believe really belongs to the 

 true V. contortus. Carp. 



Var. y. coNTORTULA (Thylacodus). 



T. parca, cerea, irregulariter spiralis ; anfr. graciles circiter 6-10 

 superne liris duabus remotissimis, lira externa ohsoleta, rugis 

 transversis cancellati ; latere inferno irregulari, lapillis agglu- 

 tinatis. 



Diam. aperturte f m. 



Hab. Gulf of California, affixed to the typical specimen. 



Approaches, according to the description, Bivonia (?) contorta, 

 var. indentata, Carp. 



Forma 1. Thylacodus (?) contortus, var. indentata. Carp. 

 " T. Biv. coutortae siniili, sed minore, colore hand rosea, scu/ptura 



indentata ; costis pavcioribus ; interstitiis profundis, cancel- 



latis." 

 Bivonia /'contorta, var. indentata, Carp. Cat. p. 307. no. 355. 

 Hab. Mazatlan; very rare on Spondyli, &c. {Liverpool coll.). Carp. 

 This form corresponds, according to the description, to forma 1 . 

 electrina, of Vermetus varians, D'Orb. 



Var. S. indentata (Vermetus). 



T.parva,pallide aurantiaca, lateraliter affixa, irregulariter spira- 

 lis; anfr. obliqui, graciles, contigui, ad suturam dilatati, appressi, 

 liris validis 4-5, liris transversis cequidistantibus lateraliter 

 fortioribus ; in anfr. medianis lamina plana tenui lata versus 

 columellam iiistructa, in parte inferiore columellce lamina brevi 

 opposita. 



Diam. aperturse \ m.; long, axis circ. 7-9 m. 



