PLEUROTOM A. 



Plate XXXVI. 



Species 326. (Mus. nost.) 



(Magnified to one and a half times its length.) 



LEUROTOMa regularis. Pleur. testd subpgramidali-o- 

 vatd, anfractibus superne concavis, medio oblique regu- 

 lariter costatis, aperturd pared, sinu lato ; albidd. 



he regular Pleurotoma. Shell somewhat pyrami- 

 dally ovate, whorls hollow round the upper part, ob- 

 liquely regularly ribbed, aperture small, sinus broad ; 

 whitish. 



eeve, Pro. Zool. Soc. 1846. 



U. ? 



Whorls obliquely ribbed round the middle with a pecu- 



ar degree of regularity. 



Species 327. (Mus. Metcalfe.) 



'Leurotoma angicostata. Pleur. testd oblongo-ovatd, 

 spirdturritd, l&eigatd, anfractibus longiiudinaliter cos- 

 tatis, costis subdistantibus, angttstis, superne angulatis, 

 submucronatis ; nived. 



'he narrow-ribbed Pleurotoma. Shell oblong-ovate, 

 spire turreted, smooth, whorls longitudinally ribbed, 

 ribs rather distant, narrow, angulated and rather 

 pointed at the upper part ; snowy white. 



Ieeve Pro. Zool. Soc. 1846. 



Jab. ? 



A pure white hexagonal shell. 



Species 328. (Mus. Metcalfe.) 

 (Magnified to two and a half times its length) 



Pleurotoma mucronata. Pleur. /mid arui,/iuato-pi/ra- 

 midali, anfractibus longituiliualiler subobscure plicato- 

 costatis, cos/in noduhsis, aperturd brevi ; fused, nodo- 

 ritiit aerie mediand aVricante. 



["he pointed Pleurotoma. Shell aeuminately pyrami- 

 dal, whorls somewhat obscurely plicately ribbed, ribs 

 nodulous, aperture short ; brown, middle row of no- 

 dules whitish. 



Reeve. Pro. Zool. Soc. 1846. 



Hub. ? 



An interesting well-defined species. 



Species 329. (Mus. Cuming.) 

 (Magnified to one and a half times its length.) 



Pleurotoma Cagayanensis. Pleur. testd fudformi-ova- 



td, spird acuminata, anfractibus superne micarinatis- 

 infra tuber culato-plicatis, transversim conspicue liratis , 

 sinu amplo ; alba. 



The Cagayan Pleurotoma. Shell somewhat fusiformly 

 ovate, spire acuminated, whorls encircled with a keel 

 round the upper part, tubercularly plicated beneath, 

 transversely conspicuously ridged ; sinus large; white. 



Eeeve, Pro. Zool. Soc. 1846. 



Hab. Cagayan, Province of Misamis, Island of Mindanao, 

 Philippines (found in sandy mud at the depth of 

 seven fathoms) ; Cuming. 



The tubercular plaits are faintly tinged with brown. 



Species 330. (Mus. Belcher.) 



Pleurotoma partita. Pleur. testd subpyriformi, spird 

 grandi, breviusculd, suturd profunda, ampld, sept is „u- 

 merosis partita ; anfractibus subtiliter siriatis, sinu la- 

 to, prof undo ; albidd aut lutescente 



The partitioned Pleurotoma. Shell somewhat pyri- 

 form, spire large, rather short, suture deep, large, di- 

 vided by numerous septa ; whorls finely striated, sinus 

 broad, deep ; whitish or yellowish. 

 Conopleura striata, Hinds. 



Hah. New Guinea (in seven fathoms mud) ; Hinds. 



The honey-combed sculpture of the suture is very re- 

 markable 



Species 331. (Mus. Cuming.) 



(Magnified to twice its length.) 

 PLEUROTOMA-T-ESSE-bfcMfar Pleur. testd pgraviitlali . an- 

 fractibus superne concavis, medio confertim tuberculato- 

 plicaiis, aperturd pared ; alba, maculis grandibus con- 

 spicuis rufo-fuscis tes.se/latd. 

 The tessellated Pleurotoma. Shell pyramidal, whorls 

 concave round the upper part, closely tubercularly, 

 plaited in the middle, api iture small; white, tessel- 

 lated with large conspicuous reddish brown spots. 



January 1S46. 



