PECTUNCULUS.— Plate VII. 



Species 41. (Mus. Brit.) 



Pectunculus Siculus. Pect. testa orbicnlari, depres- 

 siusculd, subaqui/aterali, longitudinaliter sulcata et 

 striatd ; rubido-castaned, fusco transversim zonatd, 

 zonis sape obscuris ; umbonibus testa junioris inter- 

 dum albimaculatis. 



The Sicilian Pectunculus. Shell orbicular, rather 

 depressed, nearly equilateral, longitudinally grooved 

 and striated ; reddish chestnut-colour, transversely 

 zoned with brown, zones sometimes obscure ; um- 

 bones of the young shell sometimes spotted with 

 white. 



Reeve, Pro. Zool. Soc, 1843. 



Pectunculus glycimeris, Lamarck, Philippi. 



Testa junior. 



Area bimaculata, Poli. 



Hab. Mediterranean, Coast of Sicily. 



Having adopted the old P. glycimeris of British au- 

 thors, I distinguish the P. glycimeris of Lamarck by the 

 above new title. Through some unaccountable neglect, 

 these two very different shells have been hitherto pub- 

 lished under the same title, and it is hoped that this 

 present amendment will be appreciated. 



Species 42. (Mus. Cuming.) 



Pectunculus multistriatus. Pect. testd trigono-ovatd, 

 valde compressd, longitudinaliter multi- et tenui- 

 striatd, rubicundd; int. us fused, margine planato, in- 

 tegerrimo ; umbonibus incurvis. 



The much-striated Pectunculus. Shell triangularly 

 ovate, very compressed, longitudinally much and 

 finely striated ; strire slightly waved, interior brown, 

 margin flat and entire ; umbones curved inwards. 



Deshayes, Lamarck, Anim. sans vert, (new edit.), 

 vol. vi. p. 495. 



Area multistriata, Forskael, Desc. Anim. p. 123; 

 Chemnitz, Conch, pi. 58. f. 573. 



Hab. Red Sea. 



This shell, which does not appear to have been known 

 to Lamarck, is remarkably distinct from any other spe- 

 cies of the genus. It is very depressed, and particularly 

 flat within round the margin ; the hinge is very small 

 and contracted in comparison with others. 



Species 43. (Mus. Brit.) 



Pectunculus marmoratus. Pect. testd lenticulari, 

 compressiusculd, decussatim, vix manifesfe, striatd, 

 alba, ftavescente elegantissinie marmoratd ; umbonibus 

 albis, approximatis ; margine acuto, denticulato. 



The marbled Pectunculus. Shell lenticular, rather 

 compressed, decussately, rather indistinctly, striated ; 

 white, elegantly marbled with pale yellow ; um- 

 bones white, approximating ; margin acute, denti- 

 culated. 



Area marmoruta, Chemnitz, Conch., vol. vii. p. 228. 

 pi. 57. f. 563. 



Hab. ? 



This species, it must be understood, is not the Pec- 

 tunculus marmoratus of Lamarck, though he refers to the 

 same figure in Chemnitz as that noted above. The 

 specimen described by that illustrious author, which 

 I have lately had the pleasure of examining, is nothing 

 more than a young individual of the P. glycimeris, as 

 stated by Deshayes in his edition of the ' Anim. sans 

 vert.,' note, p. 489. There are now two specimens of the 

 true P. marmoratus, figured and described by Chemnitz, 

 (so far at least as my opinion leads me,) in the British 

 Museum, from the celebrated collection of W. J. Bro- 

 derip, Esq., and I am not aware of the existence of any 

 other. 



[For Species 44, see Plate VIII., a figure of the Pec- 

 tunculus intermedius (Species 1) having been substi- 

 tuted in its place by mistake.] 



