C E R I T H I U i\I . 



Plate X. 



Species (i3. (Mus. Cuming.) 



Cerithium algicola. Cerith. tesla pyramidatu, striata, 

 alba, fulvo variegatd, longitiidinaliter plicatd, plicis 

 freqnentihas, medio angulatis, anfractihus numerosis, 

 medio angulatis, apertiira siibrotundd, colnnielld antici 

 rectiiisculd, cauali brevi, subrecurvo, labro crenulato. 



The seaweed Cerithium. Shell tapering, striated, 

 white, variegated with fulvous, longitudinally pli- 

 cated, the plicEe numerous, angular in the centre, 

 whorls numerous, angular in the middle, aperture 

 rather rounded, columella rather straight at the base, 

 canal short, recurved, outer lip crenulated. 



C. B. Auasis. 



Cerithium eburneum, var., Sowerby. 



Hab. Jamaica. 



Species 64. (Fig. a, b, Mus. Cuming.) 



Cerithium invaginatum. Cerith. testa turrild, siibcy- 

 lindraced, alba, apice atrato, spiraliter striata, aii- 

 fractibns supra iiijlatis, snbangulatis, infra coiitractis, 

 pliciferis, inter plicasfoveolatis, ultimo anfractu costd 

 scabrd duplicatd, prope basin cincin, aperlurd oblongd, 

 canali elongato. 



The sheathed Cerithiuji. Shell turreted, rather cy- 

 lindrical, white, with black apex, spirally striated, 

 whorls swelled above, slightly angular, contracted 

 below, plicated, with hollows between the plicse, the 

 last whorl girt near the base with a roughened dupli- 

 cate rib, aperture oblong, canal long. 



(lOULD, Otia Conchologica, p. 61. 



Hab. Feejee Islands. 



This interesting species is distinguished by the peculiar 

 contraction of the lower part of the whorls, which are 

 deeply pitted between the plaits. 



Species 65. (Mus. Cuming.) 



Cerithium salebrosu.m. Cerith. testa elongald, angustd, 

 albidd, fascid fulvd cinctd, longitudinaliter pliciferd, 

 plicis tubercnlatis, prope sulurani angulatis, aperturd 

 ovali, postice canaliculatd, colanielld productd, recurvd, 

 canali aperto, labro laqueato. 



The roughened Cerithium. Shell elongated, narrow, 

 white, girt with a fulvous band, longitudinally plaited, 



plaits tuberculatcd, near the suture angulated, aper- 

 ture oval, canaliculated posteriorly, columella pro- 

 duced, recurved, canal open, outer lip fluted. 



Sowerby, Thes. Conch. Cerithium sp. 55. 



Hab. Lord Hood's Island. 



A long, naiTow, irregularly varicose species, with rather 

 recurved, lengthened canal. 



Species 66. (Mus. Cuming.) 



Cerithium tessellatuji. Cerith. te-Ud brevi, ventricosd, 

 minute regulariter tuberculatd, albd, aufractibus infra 

 maculis rubris parvis, quadratis, seriatim dispositis 

 cinctis, ultimo rotunda, aperturd rotunda, postice ca- 

 nalicidatd, columella redd, canali breviusculo, labro 

 inerassato, rotundo, crenulato. 



The tessellated Cerithium. Shell short, ventricose, 

 minutely regularly tuberculatcd, white, whorls below 

 small, with redtlish-brown small square rows of spots, 

 the last rounded, aperture round, posteriorly canali- 

 culated, columella straight, canal rather short, outer 

 lip thick, round, crenated. 



Sowerby, Thes. Conch. Cerithium sp. 77. 



Hab. Darnley's Island, Australia ; .Tukes. 



This shell is marked with little square reddish spots on 

 the lower part of the whorls, giving them a tessellated 

 appearance. It has a miiuitely granulated sculpture. 



Species 67. (Mus. Cuming.) 



Cerithium muscarum. Cerith. testa pyramidatd, albd, 

 lougilttdinaliter pliciferd, inter pUcas liueis elevatis 

 rubro-punctatis cinctd, anfractihus subventricosis, su- 

 turd excavatd, aperturd rotundd, canali elongato, labro 

 laqueato. 



The fly-spotted Cerithium. Shell tapering, white, 

 longitudinally ribbed, between the ribs girt with 

 raised red-spotted lines, whorls rather ventricose, su- 

 ture excavated, aperture round, canal long, outer lip 

 fluted. 



Say, American Conchology, pi. 59. f. 2. 



Hab. Lord Hood's Island ; Cuming. 



A very pretty little species, characterized by neat little 

 red punctures on the spiral ribs, between the plaits. 



October, 1865. 



