D E N T A L I U M. 



Species 27. (Miis. Brit.) 

 Dentalium quadrangulare. Den. testa parvu, alba, 

 cj/lindraceA, longitudinaliter striata, ad api'cem 

 qiiadrigoiui, deinde ad marriinem rotundata ft 

 striata ; apice obtuso, integro. 



TUE QUADRANGHLAE DeNTALIUM. Sllell Small, wllito, 



cylindrical, longitudinally striated, four-sided at 



the apex, thence to the margin rounded ami 



striated ; apex obtuse, entire. 

 So\V£t!i!Y. Proc. Zool. Soc, l.So2. Thes. Conch. Dent. 



Sp. 4.S. 

 Ilab. Xipixapi, West Columbia. 



Species 28. (Mus. Brit.) 



Dentalium sectuji. i)t«. testa lactea, anguslissimd, 

 sitbcylindracea, vix arcuatd, politd, versils api:em 

 tciiiiissme leviter striata; apice ad dorsum 

 o/j/i<jue scctu. 



The rrr I)e.\taliu.\i. Shell white, very narrow, sub- 

 cylindrical, scarcely curved, polished, very finely 

 li.L^htly striated near the apex; apex very obliquely 

 cut on the dorsal side. 



Deshayes. ]\Ionograph of Dentalium. 



Hab. ? 



The fissure is formed by an obU(jue cut, as it were, 

 across the ape.x. 



Species 29. (Mus. Brit.) 



Dentalium c.\ncellatl'm. De». testa albd, tnuii, versus 

 apicem valide arcuatd et aciiminatd, cnstis sex 

 ad octo acutis laqueatd ; interstitiis transverse 

 foveolatis, medio et usque ad marginem rotundata, 

 striata, rectiiisculd ; apice Integra. 



The fAXCELL.\TED DENTAUU.M. Shell white, thin, 

 strongly curved, and acuminated towards tlie 

 apex, fluted with six to eight sharp ribs, with 



transversely pitied interstices, rounded, striated, 

 rather straight in the middle and towards the 

 margin ; apex entire. 

 SowEitisY. Thesaurus Conchyliovum, Dentalium, Sp. 2f<, 



f 2G. 

 Ilah. China. 



A shell of very singular .scul]ilure towards the apex. 



Species ;iO. (Mus. Cum. in Brit.) 



Dentalium splendidum. Den. testa elongald, ungiista. 

 politd, mediocriter arcuatd, lente crescenti, medio et 

 versus marginem lacted, versus apicem rubrd : 

 apice utrinque Jissurato, fissuris incisis, darsaii 

 subproductd. 



The si'LENdid Dentalum. Shell elongated, narrow, 

 polished, with a medium curve, slowly increasing, 

 milk-white in the middle and towards the margin ; 

 red towards the apex ; apex fissured on each side ; 

 fis^uires incised, the dorsal one a little produced. 



SowERBY. Proc. Zool. Soc, liS;i2. 



Hab. Xipixapi, West Columbia. 



The dorsal and ventral slits are not to be Ibund in 



every specimen of this interesting shell. 



Species 31. (Mus. Brit.) 



Dentalium attenuatum. Den. testd arigustissimd, 

 tenui, Imvigatd, mediocriter arcuatd, versus apicem 

 rufo-fulvd ; medio et versus marginem lacted : apice 

 attenuato, acuminata, integro. 



The attenuated Dentalium. Shell very narrow, thin, 

 smooth, with a medium curve, reddish-brown 

 towards the apex ; milk-white in the middle and 

 towards the apex ; apex attenuated, acuminated, 

 entire. 



SoWEiUiY. Thesaurus Conchyliurum, Dentalium, Sp. 15, 

 f 40. 



Hab. ? 



November. 1872. 



