138 



costis decurrentibus s aperturd brevi, sinu laterali superiore ; ca- 

 nali brevi, latd: long. l'l, lat. O-Ą; poli. 



Hab. ad Sinum Montijse et ad Portam Portreram. 



Found in muddy sand at ten fathoms' depth — G. B. S. 



Pleorotoma interrupta. Pleiir. testą oblongo-pyramidali, 

 pallescente; anfractibus octo, ipiraliter sulcatis , cingulatis, cingido 

 mediano nigro, alio articulato ; aperturd canaUque brevibus, sinu 

 laterali postico : long. 0'6, lat. O'l jJoU. 



Hab. ad Insulam Annaa. 



Found under coral on tlie reefs. — G. B. S. 



Pleurotoma excentrica. Pleur. testd oblongo-pyramidali, 

 brunned; anfractibus sex, duobus antick excentricis, superne 

 prope suturam unicarinatis, carind undulatd, injra spiraliter 

 sulcatis et longiludinaliter costatis ; aperturd brevi, subtrigond, 

 peritremate distincto, labii externi margine undulato ; sinu laterali 

 postico : long. 1 •'!, lat. 0*5 poli. 



Hnb. ad Insulas Gallapagos. 



Found in coral sand at the depth of six fathoms. — G. B. S. 



Pleurotoma incrassata. Pleur. testd crassd, acuminato-pyra- 

 midali, nigricante ; anfractibus novem vel decem, supeme prope 

 suturam obsolete unicarinatis, carind interruptd, infrd longitudi- 

 naliter costellatis, costellis granosis, lineis elevatiusculis sptralibus 

 decussatis; aperturd brevi, sinu laterali postico ; canali brevi, ob- 

 tusd : long. 2-3, lat. 0-8 poli. 



Hab. ad Panamam et ad JVIontem Christi. 



Dredged in from six to ten fathoms from sandy mud. — G. B. S. 



Pleurotoma duplicata. Pleur. testd acuminato-turritd, gra- 

 cili, pallidd, epidermide corned fuscd ; anfractibus undecim vel 

 duodecim, superne prope suturam lined elevatd unicd, in medio 

 tuberculato-costatis, lineis duabus elevatis, binis decussatis; ultimo 

 irifriL inconcinne striato; aperturd brevi, sinu laterali postico; 

 canali brevi : long. 1-6, lat. 06 poli. 



Hab. ad Portam Portreram et in Sinu Montijae Americae Cen- 

 tralis. 



Dredged from a sandy muddy floor at ten fatlioms' depth. — 

 G. B. S. 



Pleurotoma unicolor. Pleur. testd crassiusculd , oblongo-pyra- 

 midali, nigrd; anfractibus octo, Icevibtts, superne prope suturam 

 serie granularum unicd, iiifrd longitudinaliter costatis ; aperturd 

 brevi; canali brevissimd ; sinu laterali pctslico infra seriem granu- 

 larum: long. 0'85, lat. 0'3 poli. 



Hab. ad Panamam. 



Dredged in from six to ten fathoms on a sandv muddy floor. — 

 G. B. S. 



Pleurotoma rustica. Pleur. testd rudi, crassiusculd, oblongo- 

 pyramidali, Jusco-nigricante ; anfractibus septem, superne prope 

 suturam unicarinatis, infra longitudinaliter costatis, costis nu- 

 merosis acutis, idtimi costis lineato-decussatis, decurrentibus ; 



