Zoological Society. 203 



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

 the above peculiarities with remarkable specific distinctness. 



Triton trilinkatu.«. Trit. testii clavato-fusiformi, varicibus tri- 

 bus ; spird breviusculd ; anfractibus supernr angulutis, ad anyulum 

 compresso-tuberculatis, tra/isvershn pUtno-Urdtis, liris siibtilissimh 

 crcnulatis, interstitiis linris fribtis elevatis sculptis ; nlbidd,/usco 

 variegatd, varicibus /usco-maculatis ; columella lutescente-ulbu, 

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

 ticulato-costnto ; aperturce fauce albd. 

 Conch. Icon., Triton, \A. 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 ; anfractibus supernr angulatis, transversim cos- 

 tatis, liris minutis tribus vel quatuor inter castas dccurrentibus, 

 costis superis tuberculatis, tuberculis inferne evanidis ; albidti, 

 fuscescente maculntd ; columelld plicatd ; canali suhelonguto, sub- 

 ascendente ; aperturcc fauce albd ; labro intus denticulato. 



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 M'horl. 



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

 siusculo ; spird rotundato-depressd ; anfractibus transversim cos- 

 tatis, tuberculurum seriebus plurimis longitudinalibus armatis, 

 infer ioribus minor ibus ; albidd,fusco vari'e tinctd ; columella lavi, 

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

 dente ; labro aurantio-lutescenie, intus denticulato. 



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. testa elongato-ovatd, suhfusiformi, solidius- 

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

 minata ; anfractibus liris angustis elevatis promincntibus distantibus 

 cleganter clathratis, liris transversis duplicatis ; carulescente-albd, 

 epidermide sericd indutd ; columelld fortiter rugosd, aurantio 

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

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



Conch. Icon., Triton, pi. 12. f. 4G. 



Hab. Philijipine Islands ; Cuming. 



Although this species exhibits little more than a modification of the 

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



