298 Zoological Society. 



Hab. Island of Ticao, Philippines (found in sand at the depth of 

 six fathoms) ; Cuming. 



Pleurotoma Tritonoides. Pleur. testd subovali, apice acuto, 



fulvd, pallide albifasciatd ; anfractibus convexis, costis longitudi- 



nalibus, subtilissime nodulosis, lineis transversis elevatis eximie 



cancellatis ; labro incrassato, sinuparvo ; canali brevi, subrecurvo. 



Conch. Icon., Pleurotoma, pi. 10. f. 85. 



Hab. Bais, island of Negros, Philippines (found in coral sand at 

 the depth of seven fathoms) ; Cuming. 



This shell is of a duller and more uniform colour than the prece- 

 ding ; the last whorl is more ventricose, and the longitudinal ribs are 

 finer and more numerous. 



Pleurotoma abbreviata. Pleur. testd abbreviato-fusiformi, c<e- 

 ruleo-albd, nigro maculatd etpunctatd; anfractibus medio angulato- 

 carinatis, carind medio partitd, superne depressis,funiculo maximo 

 nigro -maculato cingulatis, inferne multifuniculatis, funiculis mi- 

 noribus nigro lineatis et punctatis ; canali vix elongate 

 Conch. Icon., Pleurotoma, pi. 10. f. 86. 



Hab. Island of Masbate, Philippines (found on the reefs at low 

 water) ; Cuming. 



A very interesting species, which looks at first sight like a broken 

 portion of the PI. tigrina. A number of specimens were collected 

 by Mr. Cuming at the above-mentioned island. 



Pleurotoma bijubata. Pleur. testd cylindraceo-pyramidali, fused, 

 fuscescente carinatd ; anfractibus convexis, cequidistanter carinatis, 

 carinis duabus centralibus jubatis ; aperturd brevi; canali brevis- 



Conch. Icon, Pleurotoma, pi. 10. f. 87. 



Hab. Island of Burias, Philippines (found under stones at low 

 water); Cuming. 



Of the two crested keels which encircle this very characteristic 

 species, the upper one is the more faintly developed. 



Pleurotoma planilabrum. Pleur. testd ovato-oblongd, apice 

 acuto ; rubido-fuscd ; anfractibus convexis, transverse lineatis, lon- 

 gitudinaliter costatis, costis fere obsoletis ; aperturd oblongd, labro 

 piano, rubido, intiis denticulato ; canali brevissimo. 

 Conch. Icon., Pleurotoma, pi. 10. f. 88. 



Hab. Sibonga, island of Zebu, Philippines (found under stones at 

 low water) ; Cuming. 



The posterior extremity of the lip in this shell is acuminated to a 

 sharp point. 



Pleurotoma corusca. Pleur. testd subpyramidali, valde politd; 

 anfractibus superne planis, fusco alboque nebulosis, inferne leviter 

 prominentioribus, punctis fuscis irregularibus cingulatis, anfractu 

 ultimo punctorum seriebus duabus cingulato ; aperturd brevi ; canali 

 brevissimo. 

 Conch. Icon., Pleurotoma, pi. 10. f. 89. 

 Hab. Island of Capul, Philippines ; Cuming. 

 Two specimens only of this shell were found by Mr. Cuming on 

 the reefs at the above-mentioned island. 



