PLEUROTOMA. 



Plate III. 



Species 15. (Mus. Stainforth.) 



Pleurotoma arcuata. Pleur. testd arcuato-fusiformi, 

 tenui, inflatd, subpellucidd, anfractibus lineatis, in 

 medio acute carinatis, carind maculis fuscis regu- 

 laribus ornatd; labro externo rotundato, ab anfractu 

 ultimo sinu Into separato ; canali graci/i, arcuato, 

 spirie longitudinem aquante. 



The curved Pleurotoma. Shell arcuately fusiform, 

 thin, inflated, rather transparent ; whorls lined, 

 and sharply keeled round the middle, keel painted 

 with regular brown spots ; lip rounded, separated 

 from the last whorl by a broad sinus ; canal slender, 

 curved, equalling the length of the spire. 



Hab. Coast of Veragua, Central America. 



A few specimens only of this inflated transparent-look- 

 ing shell were collected at the above-mentioned place, 

 by R. Hinds, Esq., of Her Majesty's Ship Sulphur, a 

 zealous and intelligent conchologist. 



Species 16. (Mus. Cuming.) 



Pleurotoma picta. Pleur. testd acutissitne turritd, solidii, 

 transuersim earinatd, alba, carinis perspicuis, sub- 

 distantibus, maculis fuscis perparce pictis, carind 

 superd valde maximd ; labro Jissurd pared, subcen- 

 trali ; canali recto, spine longitudinem (Equant e. 



The painted Pleurotoma. Shell solid, very sharply 

 turrited, transversely carinated, white ; keels, which 

 are distinct and rather distant, sparingly painted 

 with faint brown spots, uppermost keel very much 

 the largest; lip with a small, nearly central fissure; 

 canal straight, equalling the length of the spire. 



Beck MSS., Museum of the King of Denmark. 



Hab. Panama, St. Bias, Gulf of Nicoya, &c, Western 

 coast of America. Hinds. 



This shell is of a straight solid growth, and cannot 

 well be confounded with any species hitherto described. 



Species 17. (Fig. a and b, Mus. Cuming.) 



Pleurotoma oxytropis. Pleur. testd turrito-subulatd, 

 brunnescente, anfractibus validi carinatis, interstitiis 

 decussatis, carind superd maximd, conspicud; fissurd 

 subcentruli ; canali recto, sjiirie longitudinem aquante. 



The strongly-keeled Pleurotoma. Shell sharply 



turrited, brownish ; whorls strongly keeled, upper- 

 most keel largest, conspicuous ; slit rather central ; 

 canal straight, equalling the length of the spire. 



Sowerby, Proc. Zool. Soc, 1833. 



Reeve, Conch. Syst., vol. ii. pi. 233. f. 2. 



Hab. Bay of Panama. (Found in sandy mud at from 

 thirteen to twenty fathoms depth.) Cuming. 



I have figured a very young and an adult specimen of 

 this rare species, in order to exhibit the remarkable 

 change of form which it apparently assumes in different 

 stages of growth ; the series of specimens before me is 

 not sufficiently extensive to show the complete progress. 



Species 18. (Mus. Cuming.) 



Pleurotoma undosa. Pleur. testd elongato-turritdjrans- 

 versim earinatd et striatd, albidd, maculis strigisve 

 rubido-fuscis, longitudina/iter undosis, profuse or- 

 natd ; canali breviusculo, columelld et aperturce fauce 

 purpureo-tinctd. 



The waved Pleurotoma. Shell elongately turrited, 

 transversely carinated and striated, whitish, pro- 

 fusely ornamented with longitudinally-waved red- 

 dish-brown spots or streaks ; canal rather short ; 

 columella and within the aperture stained with 

 purple. 



Lamarck, Anim. sans vert., vol. vii. p. 95 ; Enc. Meth.. 

 pi. 439. f. 5. 



Hab. Island of Masbate, Philippines. (Found on coral 

 reefs.) Cuming. Coast of Pondicherry, India. 

 Kiener. 



I cannot see the resemblance noticed by Kiener be- 

 tween this shell and the Pleurotoma variegata (Sp. 2.) ; 

 indeed, they would come under separate sections in a 

 systematic arrangement of the group, by reason of the 

 difference in their canals. 



Species 19. (Mus. Stainforth.) 



Pleurotoma Deshayesii. Pleur. testd elongato- turritd, 

 fusco-ftuvescente, transversim striatd, exiliter cari- 

 natd; anfractibus leviter convexis, zonula in medio 

 cinctd ; canali longiuscuto. 



Deshayes' Pleurotoma. Shell elongately turrited, yel- 

 lowish-brown, transversely striated, faintly sulcated . 



Feb. 1843. 



