LITTORINA. 



Species 18. (Fig. a, b, c, d, Mus. Cuming.) 

 I.ITTORINA LITTOEEA. Litt. testd omto-turbinatd, im- 

 perforaid, crassd, leevigald vel spiraliter elevato-dri- 

 atd, anfractibus interdum superne concavo-impres»is ; 

 oUvaced, aut cinered, aid ntfd, nigricanU interdum 

 fasciatd et lineald ; coiumelld late caUosd,sii6excavaid, 

 alba. 

 The shore Littorina. Shell ovately turbinated, im- 

 perforated, thick, smooth or spirally elevately stri- 

 ated, whorls sometimes coiicavely impressed round 

 the upper part ; olive, or ash, or red, sometimes 

 banded and lineated with black ; columella broadly 

 callous, slightly excavated, white. 

 Turbo littoreus, Linnajus, Syst. Nat. p. 1232. 

 Turbo ustulatus, Lamarck. 

 Littorina vulgaris, Sowerby. 

 Littorina liltorea, Johnston. 

 Hab. Atlantic shores of Europe. 



Of tliis species, the well-known eatable Periwinkle of 

 our market, we have selected four varieties, difl'ering in 

 colour and even in form, so far as regards the angular 

 depression of the upper portion of the whorls. 



Species 19. (Tig. a, b, Mus. Cuming.) 

 Littorina varia. Litt. testd acuviinato-ovatd, imper- 

 forald, crassiusculd, dense irregularlter carinatd, prope 

 suturam canaliculatd ; lutescente-albd, lineis nigris 



undique tessellato-lentiginosd ; coiumelld sublate exca- 

 vatd, margine nigro-lineato. 



The varied Littorina. Shell acuminately ovate, im- 

 perforated, rather thick, densely irregularly keeled, 

 somewhat channelled next the suture; yellowish- 

 white, everywhere tessellately freckled with black 

 lines; columella rather broadly excavated, margin 

 black-lined. 



Sowerby, Genera of Shells, No. 37. 



Hab. Panama. 



A prettily marked species, densely irregularly keeled 



throughout. 



Species 20. (Mus. Cuming.) 

 Littorina fasciata. Litt. testd ovato-turbinatd, sub- 

 ventricosd, iniperforatd, lavigatd; albidd, fasciis li- 

 neisque fusco-griseis oblique undatd ; aperturd subcon- 

 tractd, coiumelld late eicavatd, margine fusco-lineato. 

 The banded Littorina. Shell ovately turbinated, 

 somewhat ventrieose, imperforated, smooth ; whitish, 

 obliquely waved with brownish-grey bands and lines ; 

 aperture somewhat contracted, columella broadly ex- 

 cavated, margin brown-lined. 

 Gray, Zool. Beechey's Voyage, p. 139. 

 Hab. Tumbez, Peru ; Cuming. 



A fine bold species, lineated and obliquely banded, cha- 

 racterized by a dark blotch upon the columellar area, which 

 is more than usually twisted. 



May, 1S57. 



