1861.] M. O. A. L. MORCh's REVIEW OF THE VERMETID^E. 181 



impressio muscularis conferte lira fa, opaca, peripheria leviter im- 

 pressa ; limbo nitido tripartita ; zona interna sulcis 2-3 spiralibus, 

 mediana parva vix sulcata, externa tenuis flavescens rejlexa. 



Diam. 9\ m., impress, muse, fere 3 m., apart, testse 9 m. 



Aletes not milike A. squamigerus. Carp. Cat. p. 304, lin. 28 (coll. 

 Cuming.), sine loco. 



The operculum is very like that of V. eburneus ; but the muscular 

 impression is not limited by an elevated line and flat channel. The 

 affixed side shows four or five diverging channels, very likely the im- 

 pression of the branches of a Gorgonia : on a part where the outer 

 shell is broken is to be seen a very long oblique septum, perhaps 

 pathological. The first whorls are lost ; but a specimen from Pun- 

 tarenas {Oersted) seems to correspond with it very well, only the 

 scales are much feebler ; its nuclear shell is helicoid and glossy. 

 Another specimen from the same locality, perhaps even Ihe latter 

 whorls of the same specimen, has six to eight marked lirse, with 

 three close-set small lirse in the interspaces. The scales are very 

 numerous, small, and close-set ; the colour is ferruginous, variegated 

 with a foreign green hue. 



Diam. of aperture 6-7 m. 



The striae of growth of V. eburneus are sometimes raised ; but I 

 have not seen them forming scales. 



38. Vermiculus effusus, Valenc. 



Vermetics effusus, Val., Chenu, 111. pi. 5. f. 4 a-c ; Morch, J. de 

 Conch, viii. p. 38. 



Siphonium effusum, Chenu, Man. p. 320, f. 2301. 



Fig. 4 of Chenu is taken from the very same specimen represented 

 as V. centiquadrus in ' Voy. de Venus ' ; the specific name seems best 

 to suit fig. 4 a. The lid, if represented of the natural size, seems 

 too large for the shell. 



EXPLANATION OF PLATE XXV. 



Fig. 1. Slephopoma tricuspe. Spine of operculum. 



2. Stephopoma senticosum. Spine of operculura. 



3, 4, 5. Stephopoma pennatum. Shell. 



6, 7. Stephopoma pennatum. Operculum. 



8. Stephopoma pennatum. Spine of operculum. 



9. Stephopoma pennatum, var. bispinosa. Operculum. 



10. Stephopoma pennatum, var. bispinosa. Spine of operculum. 



11. Stephopoma roseum. Spine of operculum. 



12. Siphonium (Dendropoma) megamastum. Operculum. 



13. Siphonium {Dendropoma) megamastum. Spine of operculum. 



14. Stepfiopoma senticosum. Young shell. 



15. Siphonium {Stoa) subcrenatum, var. spinosa. Operculum. 



16. Siphonium {Stoa) subcrenatum, v&t. spinosa. Spine of operculum. 



1 7. t'ermiculus pellucidus, var. volubilis. 



18,19. Vnrmiculus pellucidus, vax. volubilis. Shell. 

 20. Fermiculus peltucidus, var. volubilis. Operculum. 



