the Crenus Phinaxis. 43 



tenui, acuto, et niaculis 5 brunneis notatum, intus incrassatum, 

 8-denticulatuin ; columella arcuata, callo postico parvo. 

 Long. 6 mill., diam. 3. 



Hah. West Indies, St. Thomas and St. Vincent. 



An ivory-white species withoiit other marking than a brown 

 apex and a few brown dots on the exterior of the outer lip. 

 The chief peculiarity of this shell, however, consists in the 

 spiral ribs being divided into two equal parts by an impressed 

 line, thus giving them a concave appearance. 



24. Planaxis suturalis. 



P. testa parva, alba ; spira turrita, elongata, apice acuminato ; sutura 

 subcanaliculata ; anfr. 8, planiusciili, spiraliter sulcati ; anfr. ult. 

 sulcis 11 cinctus, ad peripheriam obtusatim angidatus, basi con- 

 tractus, cum columella caudam brevem formans ; apertura ovata, 

 spira longe brevior; columella arcuata, callo postico parvo non 

 tuberculari ; canalis basalis profundus ; labnim crassum, intus 10- 

 denticulatum. 



Long. 6| mill., diam. 3. Coll. Sylvanus Hanley. 



Hah. Chinese seas. 



A very pretty species, at once distinguished irova. P.ehoreus 

 by its turreted spire, deep suture, and the spiral ribs being- 

 flat, and not bipartite. 



25. Planaxis stri'atulics. B.M. 



Planaxis striatulus, Philippi, Zeitschrift fiir Malak. 1851, p. 91. 

 Hah. ? 



26. Planaxis ater. B.M. 



Planaxis atra, Pease, American Joiirn. Conch, vol. \. p. 72, pi. 8. fig. 4. 

 Hah. Marquesas Islands. 



27. Planaxis ahhreviatus. B.M. 



Planaxis ahhreviata, Pease, Proc. Zool. Soc. 1865, p. 515 ; American. 

 Journ. Conch, iv. p. 101, pi. 12. fig. 16. 



Hah. Sandwich Islands. 



28. Planaxis incisus. 

 Planaxis incistts, Philippi, Zeitschrift fur Malak. 1851, p. 92. 

 Hah. ? 



This appears to approach P. ahhreviatus in several of its cha- 

 racters. The size, colour, character of the incision above, and 

 number of the lira3 within the aperture are similar. 



