Pleurotoma Dysoni. Plear. testd ovald, apird subturritd, an- 

 fractibus supertie concavis et obtuse carinatis, infra rotundatis, 

 longitudinaliter costatis, liris iransversis decussatis, aperturd brevi, 

 s'mu amplo ; castaneo-fuscd, anfractuum parte superiori hic illic 

 interriipte albifasciatu. 

 Hab. Hondūras ; Dyson. 



I have much pleasure in naming this shell, at the request of Mr. 

 Cuming, after Mr. Dyson, whose adventurous researches after objects 

 of natūrai history in a country not the most healthy for European 

 travellers are certainly worthy of being recorded. 



Pleurotoma Hondueasensis. Pleur. testd oblongo-ovatd, spird 

 acutd, anfractibus rotundatis, nodoso-costatis ; cinereo luteoque 

 alternutim fasciatd ; labro incrassato. 



Hab. Hondūras ; Dyson. 



Pleurotoma fenestrata. Pleur. testd fusifornū-ovatd, subinflatd, 

 tenui, pellucidd, anfractibus rotundis, liris superficiariis subdistan- 

 tibus undique clathratis, labro simplici, sinu latiusculo ; pellucido- 

 albd, aurantio pallide tinctd. 



Hab. Island of Mindoro, Philippines (found among coral). 



Pleurotoma granicostata. Pleur. testd abbreviato-ovatd, basi 

 truncatd, spird brevi, anfractibus pulcherrime granoso-costatts, 

 liris transversis clathratis ; albidd, roseo-fuscescente tinctd, granis 

 saturatioribus. 



Hab. ? 



Pleurotoma regularis. Pleur. testd subpyramidali-ovatd, an- 

 fractibus superne concavis, medio oblique regulariter costatis, aper- 

 turd parvd, sinu lato ; albidd. 



Hab. ? 



Pleurotoma angicostata. Pleur. testd oblongo-ovatd, spird tur- 

 ritd, Itevigatd, anfractibus longitudinaliter costatis, costis subdi- 

 stantibus, angustis, superne angulatis, submucronatis ; nived. 



Hab. ? 



Pleurotoma mucronata. Pleur. testd acuminato-pyramidali, an- 

 fractibus longitudinaliter subobscure plicato-costatis, costis nodu- 

 losis, aperturd brevi ; fuscd, nodorum serie mediand albicante. 



Hab. } 



Pleurotoma Cagayanensis. Pleur. testd fusiformi-ovatd, spird 

 acuminatd, anfractibus superne unicarinatis, infra tuberculato-pli- 

 catis, transversim conspicue liratis ; sinu amplo ; albd. 



Hab. Cagayan, province of Misamis, island of Mindanao, Philip- 

 pines (found in sandy mud at the depth of seven fathoms) ; Cuming. 



Pleurotoma tessellata. Pleur. testd pyramidali,. anfractibus 

 superne concavis, medio confertim tuberculatoplicatis, aperturd 

 parvd; albd, maculis grandibus conspicuis rifo-fuscis tessellatd. 



Hab. Isle of Capul, Philippines (on the reefs) ; Cuming. 



