costis interstitialibus numerosis, spinisj'reąuentibus, brevibus, sub- 

 arcuatis ; intus albu, limbo lato*plicato croceo, pHcis nmnerosis : 

 long. 41, alt. 4^, lat. 21- poli. (spiiiis indusis). 



Hab. in America Centrali. (Gulf of Tehuantepec). 



Obs, Varietas forsan Spond. Principis. 



Dredged up from ten fathoms attached to shells. — W. J. B. 



Spondylus Leucacantha. Spond. testd rotundaid, 6-costatd, 

 spinosd, subcroced, spinis sublingidatis, subrejle.ns, longioribus, 

 albis; interstitiis strintis; costis interstitialibus 3 {medici maxima) 

 spinosis, spinis brevioribus ; intils albd, limbo angusto pallide 

 subcroceo: Icng. 2^, alt. 2į, lat. i-y poli. {spinis haud indusis). 



Hab. ad Insulam Platam. 



Obs. Spinis infra subcanaliculatis. — W. J. B. 



Spondylus aculeatus. Spond. testu rotundatd, planiusculd, 

 albd, spinis aculeatis, subrecurvis,frequentibus,gracilibus horridd : 

 long. 1, alt. I, lat. i poli. (spinis Itaud indusis). 



Hab. in Oceano PaciUco. (Lord Hood's Island,) 



Found attached to a piece of coial on the reefs. — W. J. B. 



Genus Tuiton. 

 Triton lignarius. Trit. lesta globoso-pi/riformi longitudinali- 

 ter subplicatd, trnnsversim granuloso-striata, flavd striis satura- 

 tioribus ; columelld excavatd, aperturce limbo luteo-sanguineo, den- 

 tibiis albis ; labro lato, crasso ; caudu mediocri subrecurvd ; epi- 

 dermidefuscd, reticulatd, ad labrum villosd: long. l-į-, lat. I poli. 

 Hab. ad Fortiini Protrero et Panamam, 



The eievated stricc, especially the two middle ones of the body 

 whorl, are of a much darlcer colour than the ground of the shell, 

 which is reddish yellow, here and there mottled with whitish on the 

 longitudinai plaits, and on the ledge of the lip. The teeth of the 

 outer lip are very large, and there is one very large one at the upper 

 angle of the inner lip. The reticulated epidermis is villous at the 

 outer lip, and the villous edges mark the stages of growth in young 

 specimens. Found in sandy mud at a depth of from seven to twelve 

 fathoms.— W. J. B. 



Triton constrictus. Trit, testujusį/ormi, valde distortd, trans- 



versim noduloso-striatd, subcancellatd, subfulvd ; spird elongatd, 



attenuatd; canali brevissimd, subrecurvd; aperturd coarctatd, 



limbo castaneo, granuloso, granulis albidis: long. 2^, lat. If poli. 



Hab. ad Montem Christi et Xipixapi. 



Another species of those shells called grimaces. It differs ma- 

 terially both from Trit. Anus and Trit. clathratus, is a heavier shell 

 than the latter, and has a much longer spire and shorter canal than 

 either of those species, vvhile it vvants the laminated border that so 

 remarkably surrounds the aperture of Trit. Anus, and is even more 

 distorted. 



Mr. Cuming dredged it up from sandy mud from seven to ten 

 fathoms belo\v the surface, — W. J. B, 



TiiiTON TIGRINUS. T) it. tcstdfusiformi, Iccvi, subcostatd, anfrac. 



