PLEUROTOMA.— Plate XV. 



The lip of this delicate shell does not become in the 

 slightest degree thickened. 



Species 124. (Mus. Deshayes.) 

 Pleurotoma harpularia. Pleur. testa elongato-turritd, 

 castaned ; anfractibus superne unicarinatis, infra lon- 

 gitudinaliter costatd, costis regularibus, obliquis, in- 

 terstitiis subtilissime striatis ; canali brevi. 

 The little harp Pleurotoma. Shell elongately tur- 

 rited, chestnut colour; whorls encircled with a 

 single keel round the upper part, longitudinally 

 ribbed beneath, ribs oblique and ranged with great 

 regularity, interstices between the ribs very finely 

 striated ; canal short. 

 Des Moulins, Revis. Pleur. p. 56 (note). 



Pleurotoma harpula, Valenciennes. 

 Hab, Coast of New Holland ; Kiener. 



As the specific title of harpula should be appropriated 

 to the Murex harpula of Brocchi, a fossil species of 

 Pleurotoma, I have thought it proper to adopt the word 

 harpularia, proposed by M. Des Moulins in his valuable 

 memoir entitled 'Revision de quelques especes de 

 Pleurotomes,' in the Transactions of the Linnsean So- 

 ciety of Bordeaux. 



I have to thank M. Deshayes for the loan of this in- 

 teresting shell, brought in the ship " Astrolabe " from 

 New Holland. 



the preceding. The P.fuscescens is a short stout rude 

 ly formed shell, very much contracted at the aperture, 

 whilst the P. harpularia is of an elegant symmetrical 

 growth, with the ribs ranging obliquely and never gra- 

 nulous ; and of several specimens of both species before 

 me, none exhibit the least intermediate modification of 

 these peculiarities. 



Species 125. (Mus. Gray.) 

 Pleurotoma fuscescens. Pleur. testd obeso-turritd, 

 solidd.fuscescente, anfractibus convexis, superrie uni- 

 carinatis, carina interdum granulosa, interdum quasi 

 diffissa, infra longitudinaliter costellatis, costellis 

 rectis, anfractds ultimi granulosis ; aperturd brevi, 

 canali brevissimo ; labro incrassato, limbo acuto, sinu 



lato. 

 The brown Pleurotoma. Shell stoutly turrited, solid, 

 brown ; whorls convex, encircled round the upper 

 part with a single keel, which is sometimes granu- 

 lous, sometimes split as it were into two keels, lower 

 portion of the whorls longitudinally ribbed, ribs 

 straight, granulated on the last whorl ; aperture 

 short, canal very short ; lip thickened, edge sharp, 

 sinus broad. 

 Gray, MSS. (private cabinet). 



Hab. ? 



Care must be taken not to confound this species with 



Species 126. (Mus. Cuming.) 

 Pleurotoma brevicaudata. Pleur. testd abbreviato- 

 fusiformi, solidd, luteold, apice basiquefuscescentibus; 

 'anfractibus convexis, superne unicarinatis, infra bi- 

 carinatis, anfractu ultimo multicarinato ; labro sim- 

 plici, acuta; sinu amplo ; aperturd parvd, brevi, canali 

 breviusculo. 

 The short-tailed Pleurotoma. Shell shortly fusi- 

 form, solid, yellowish, brown at the base and apex ; 

 whorls convex, encircled with a single keel round 

 the upperportion and a double keel round the lower; 

 last whorl encircled with single and double keels 

 alternately down to the base, lip simple and acute, 

 sinus large; aperture small, short, canal rather 

 short. 

 Reeve, Pro. Zool. Soc, 1843. 

 Hab. Island of Ticao (found on the reefs) ; Cuming. 



This shell reminds one somewhat of the P. jubata, but 

 has no indication of the pretty beaded crest which di- 

 stinguishes that species. 



Species 127. (Mus. Cuming.) 

 Pleurotoma rugifera. Pleur. testd oblongo-pyrami- 

 dali, apice acuto ; rubidd, interdum albd ; anfractibm 

 superne crenatis, infra longitudinaliter costellatis 

 ultimi dorso rugifero ; aperturd brevi, canali brevi 

 labro incrassato, sinu prof undo. 



The wrinkled Pleurotoma. Shell oblong, pyrami- 

 dal, apex sharp ; reddish, sometimes white ; whorls 

 crenated round the upper part, longitudinally rib- 

 bed beneath, back of the last whorl wrinkled 

 aperture short, canal short ; lip thickened, sinu: 

 deep. 



Sowerby, Pro. Zool. Soc, 1833. 



Hab. Gallapagos Islands (found in fine coral sand at th 

 depth of six fathoms) ; Cuming. 

 A sharp solid little shell with a remarkably strum 



sinus. 



