Zoological Society. 203 



examples of this species in different stages of growth, all exhibiting 

 the above peculiarities with remarkable specific distinctness. 



Triton trilineatus. Trit. testa clavato-fusiforml, varicibus tri- 

 bus ; spird breviusculd ; an/ractibus superne angulatis, ad angulum 

 compressO'tuberculatis, transversim plano4iratis, liris subtilissimh 

 crenulatis, interstitiis lineis tribus elevatis sculptis ; albidd, fusco 

 variegatd, varicibus fusco-maculatis ; columella lutescente-albd, 

 costatd ; canali subelongato, leviter ascendente ; labro fortiter den- 

 ticulato-costato ; apertures fauce albd. 

 Conch. Icon., Triton, pi. 10. f. 31. 

 Hab. Philippine Islands ; Cuming. 



This is a strongly marked species, with the denticulated sculpture 

 of the lip extending into the aperture after the manner of ribs ; and 

 the body of the shell is crossed by flattened ridges, between each of 

 which are three very characteristic raised lines. 



Triton .egrotus. Trit. testd subpyriformi, varicibus validis duo- 

 bus ; spird acuta ; an/ractibus superne angulatis, transversim cos- 

 tatis, liris minutis tribus vel quatuor inter castas decurrentibus^ 

 costis superis tuberculatis , tuberculis inferne evanidis ; albidd, 

 fuscescente maculatd ; columelld plicatd ; canali subelongato, sub- 

 ascendente ; apertures fauce albd; labro intus denticulate. 

 Conch. Icon., Triton, pi. 12. f.42. 

 Hab. China. 



Care must be taken not to confound this shell With the Triton tri- 

 lineatus, in which the dorsal tubercles are more strongly developed, 

 and which has no varix on the back of the penultimate whorl. 



Triton encausticus. Trit. testd pyriformi, varice unico depres- 

 siusculo ; spird rotundato-depressd ; anfractibus transversim cos- 

 tatis, tuberculorum seriebus plurimis longituditialibus armatis, 

 inferioribus minoribus ; albidd, fusco varie tinctd ; columelld Icevi, 

 crassissime encausticd, aurantio-lutescente ; canali elongate, ascen- 

 dente ; labro aurantio-lutescente, intus denticulate. 



Conch. Icon., Triton, pi. 12. f. 43. 



Hab. Island of Ticao, Philippines (found on the reefs) ; Cuming. 



The enamelled character of the mouth of this shell is somewhat 

 like that of the Triton tuberosus ; the form is that of the Triton re- 

 tusus. 



Triton ridens. Trit. testd elongato-ovatd, subfusiformi, solidius- 

 culd, distortd, varicibus quinque serve subindistinctis ; spird acu- 

 minatd ; anfractibus liris angustis elevatis prominentibus distantibus 

 eleganter clathratis, liris transversis duplicatis ; ccerulescente-albd, 

 epidermide sericd indutd ; columelld fortiter rugosd, aurantio 

 tinctd ; canali breviusculo, vix ascendente ; aperturd parvd, coarc- 

 tatd; labro intus fortiter dentato, albo, aurantio marginato. 



Conch. Icon., Triton, pi. 12. f. 46. 



Hab. Philippine Islands ; Cuming. 



Although this species exhibits little more than a modification of the 

 characters of the Triton cancellinus, the difference is of good specific 



