136 



tū$ uUimi dorso fasco, planulnto ; aperturd brevi, canali brevis- 

 simd; emarginaturd posticali : long. 1% lat. 0-35 poli. 



Hab. ad Insulas Gallapagos. 



From a depth of six fathoms in fine coral sand. — G. B. S. 



Pleurotoma olivacea. Pleur. testd fusiformi, olivaced, uni-^ 

 colore ; spira acuminato-pi/ramidali ; anfractibus novem, superne^ 

 Icevibus, infrd tuberculosis et spiraliter striatis, ultimo antice 

 striato ; aperturd oblongd, atitice canalem efformante ; labio ex- 

 terno tenui intus striato ; emarginaturd labii externi posticali; 

 suturis connatis : long. 2*4, lat. 0*8 poli. 



Hab. ad Salango et ad Sanctam Elenam Columbise Occidentalis. 



Found in sandy mud at from five to twelve fathoms.— G. B. S. 



Pleurotoma cincta. Pleur. testd crassd, oblongd, nigrd ; an- 

 Jractibus novem, superne lamelld spirali, infrd. cingulo Jlavo me- 

 diano crenato, ultimo cingulis duobus Jlavis , superiore crenato, 

 lineisque tribus elevatis crenatis ; aperturd brevi ; canali brevis- 

 simd: long. O-l, lat. 0-3 poli. 



Hab. ad Montem Ohristi et ad Xipixapi. 



Found in sand and gravel at a depth of seven fathoms. — G. B. S. 



Pleurotoma bicanalifera. Pleur. testd turritd, gracili, tenui ; 

 anfractibus novem, longitudinaliter costellatis, costellis graniferis ; 

 aperturd oblongd, ntrinque canaliferd, labio externo late reJlexo : 

 long. 0-8, lat. 0-3 poli. 



Hab. ad oras AmericfE Centralis. 



Dredged from a depth of ten fathoms in sandy mud ; from the 

 Bay of Montija. — G. B. S. 



Pleurotoma cornuta. Pleur. testd oblongo-pyramidali, apice 

 acuto ; anfractibus sex vel septem, superne crenatis, infrd longi- 

 tudinaliter costatis, transversim concinne striatis ; aperturd ob- 

 longd, canali brevi ; peritremate postice incrassato, in cornu 

 breve producto : long. 01, lat. 0*3 poli. 



Hab. ad Sinum Caraccas Columbiae Occidentalis. 



Found in sandy mud at a depth of ten fathoms. — G. B. S. 



Pleurotoma rugifera. Pleur. testd oblongo-pyramidali, apice 

 acuto ; anfractibus octo vel novem, superne crenatis, mediani 

 longitudinaliter costellatis, idtimi dorso rugifero ; aperturd brevi ; 

 labio externo incrassato, emarginaturd posticali profundd: long. 

 01, lat. 0-2 poli. 



Hab. ad Insulas Gallapagos. 



Dredged in six fathoms water among fine coral sand. 



This species varies much in colour. — G. B. S. 



Pleurotoma mouesta. Pleur. testd ovato-subcylindraced,fulvd, 

 apice subulato-pyramidali ; aiifractibus sex vel septem, transversim 

 carinulatis, carinulis crenatis; aperturd canaliaue brevibus, emar- 

 ginaturd laterali pone medium labii positd : long. O'l, lat. 0-25 

 poli. 



Hab. ad Real Liejos et ad Tnsulam Annaa. 



Dredged in sandy mud at eight fathoms' depth. — G. B. S. 



