192 FISSURELLID.E. 



56. tenebrosa (f. 67), Sowb. G. B. 2. — F. nigroemcta simili, 

 sed magis rotunda; radiisnigris,uebulosis; costellis vixelevatis,sub- 

 nodosis; margine aperturse vix crenulato. Obs. A more rounded 

 shell, more loosely ribbed and cloudily black-rayed than the pre- 

 ceding, only slightly crenulated at the margin of the aperture. 



57. Balanoides (f. 94), Roe. — Ovali, conica, subviridi, fusco 

 vel olivaceo radiatim fasciata, costellis depressis subevanidis radi- 

 ata ; intus viridi; margine leviter crenulato. Obs. This shell re- 

 sembles in general appearance a smooth variety of Patella vulgata, 

 plus the fissure. 



58. nimbosa (f. 136), Linn. — Ovali, antice subattenuata, 

 conica, elevata, subviridi, inter costas lineis nigris et viridibus radi- 

 atim fasciata ; costellis albis, subnodulosis ; foramine ovali, pro- 

 fundo, medio contracto ; intus viridi ; margine creuulato-nigro, 

 punctato. 



59. volcano (f. 87), Eve. — Ovali, conica, prope foramen 

 elevata, costellis scabris rotundis insequalibus radiata, fasciculis 

 rubris nigro-punctatis radiatim fasciata ; foramine alto ; intus 

 alba; margine crenato, maculato. 



Margin denticulated. Apex leaning forward. (Gen. "Lucapina.") 



60. neglecta (f. 139), ])esh. — Lata, prope margines depressa, 

 prope apicem elevata, antice subattenuata, postice dilatata, lateri- 

 bus medio arcuatis concentrice undulatim striata, fulvo-grisescente; 

 costis rotundis, striatis, alteris distantibus exstantibus, alteris inter- 

 mediis numerosis depressiusculis; intus alba; margine duplicatim 

 denticulate, prope apicem calloso; callo postice truncate ; foramine 

 antice declivi. Obs. The ribs are peculiarly festooned with striae 

 arching upwards ; about every fourth rib is more prominent thau 

 the intermediate. 



61. Metcalpei (f. 140, 141, 142), Eve.— Quam F. neglecta 

 angustiore, costellis magis ajqualibus. Obs. Although narrower and 

 more finely sculptured, this species, which includes F. viminea of 

 the same author, exhibits the same festooned striation over the 

 ribs, and otherwise resembles F. neglecta. 



62. subrostrata (f. 215), Guild., Sowb. — Irregulariter ovali, 

 postice atteuuata, depressa, marginibus ad terminos elevatis, fusca, 

 scabrosa, costis acute imbricatis subangulatis radiata ; intus alba ; 



