180 M. o. A. L. morch's review of the vermetid.e. [iVpril 9, 



Var. 2. DisciFER, from var. S. 



Hab. Puntarenas (Oersted) : a smaller specimen. 



Operculum superne laminis brevibus detritls, centra disco pallida 

 praminulo plana, concentrice confertissime striolato ; inferne pla- 

 num, badiuin ; area centralis irregulariter concentrice lirata. 



Diam. 11 m., diam. impress, muse, fere 5 m. 



Var. 3, from var. e, of which the auimal is described, fig. 17. 

 Diam. 10 m., diam. impress, muse. 3^ m. 



The muscular impression is proportionately much larger than that 

 of the first described, which is much thinner. 



Var. 4. SUBGRANOSA, from var. r]. 



Operculum superne concaviusculum, lamina concentrica juxta peri- 

 pheriam, laminis medianis obliteratis, inferne badium ; irnpressia 

 muscularis conferte granuloso-rugosa {an morbo ?), canali irregu- 

 lari circumdata ; zona interna rugis abliquis approximatis . 

 Diam. 6 ni., impress, muse. 2^ m. 



On the surface are some cyhndrical detached bodies like blunt 

 spines, which look as if they were broken off at the base, but I be- 

 lieve they scarcely belong to the operculum. 



Operculum testa juvenilis. 



Diam. aperturae 3 m. 



Hab. Puntarenas (Oersted). 



Op. inferne spiraliter liratum ; impressio muscularis indistincte ter- 

 minata, annulo centrali. 



Diam. 2^ m. 



The operculum is very variable, it varies from black to pale brown ; 

 the channel surrounding the muscular impression becomes deeper 

 with age, whilst it is very indistinct in the young state. The 

 radiating striae of the lamince form small denticles in the border if 

 looked at under tlie microscope. The operculum of Serpula pana- 

 mensis, represented by M. de Serres, Ann. Sc. Nat. 1855, v. p. 243. 

 t. 8. f. 7, is perhaps of this species ; but fig. 8 is very likely erroneous. 



Sect. C. Spira minuta helicoidea. 



The two following species are referred to this genus on account of 

 the operculum, notwithstanding the very different form of the shell. 



37. Vermiculxjs rastrum, Morch. 



T. lateraliter affixa, laqueatim contorta, alba pallide fiavescens ; anfr. 

 semiteretes, incequales, marginibus dilatatis, superne liris 10-12 

 compressis, squamas confertas for?iicatas amplectentibus, inter sti- 

 tiis lira plana interdum duplicata, squamis confertissimis arcuatis 

 brevibus, anfr. ultimo juxta aperturam libera, cylindrica, coarc- 

 tato ; apertura circularis. 



Operculum superne concaviusculum, laminis laciniatis confertissimis, 

 centra conferte lirulato laviusculo ; inferne planiusculum, badium ; 



