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obliquely than usual; the general appearance of the shell is not 
much unlike that of the P. tessellatus ; it is however lighter and more 
depressed, with colour and spotting of somewhat different character. 
Precruncutus Sicutus. Pect. testd orbiculari, depressiusculd, sub- 
equilaterali, longitudinaliter sulcatd et striatd ; rubido-castaned, 
fusco transversim zonatd, zonis sepe obscuris ; umbonibus teste 
junioris interdum albimaculatis. 
Conch. Icon., Pectunculus, pl. 7. f. 41. 
Pectunculus glycimeris, Lamarck, Philippi. 
Testa junior. 
Arca bimaculata, Poli. 
Hab. Mediterranean, coast of Sicily. 
Having adopted the old P. glycimeris of British authors, I distin- 
guish the P. glycimeris of Lamarck by the above new title. Through 
some unaccountable neglect, these two very different shells have been 
hitherto published under the same title, and it is hoped that this 
present amendment will be appreciated. 
Precruncuius perpix. FPect. testd orbiculato-cordatd, subauritda, 
radiatim costatd ; costis planulatis, subindistinctis, longitudinaliter 
striatis, strigis rubido-fuscis, transversis, angulato-undatis, pro- 
Suse pictis. 
Conch. Icon., Pectunculus, pl. 8. f. 46. 
Hab. Straits of Malacca (found in mud at the depth of seventeen 
fathoms) ; Hinds. 
The form of this shell approximates very closely to that of the 
Pectunculus zonalis, but the painting of it is of a very different cha- 
racter. The beautiful specimen here figured, collected by Sir E. Bel- 
cher, is the only example of the species I have seen, with the excep- 
tion of a small, worn, odd valve in the collection of M. Deshayes. 
Prectuncuuus spapiceus. fect. testd orbiculari, radiatim striata, 
pallide spadiced, umbones versus albd, strigis latis, updatis, ornatd ; 
epidermide holosericd ; intus albd, margine ewiliter crenulato. 
Conch. Icon., Pectunculus, pl. 8. f. 47. 
Hab. ? 
There is no very striking peculiarity in this species, although it is 
too distinct from any other to require comparison. I have seen se- 
veral specimens of it, both in London and Paris, but have not suc- 
ceeded in obtaining its true locality. 
PectuncuLus rorMosus. ect. testd lenticulari, subdepressd, vel 
levi vel subobscure radiata, subtilissimé concentricé striatd ; luteo- 
lacted, maculis sparsis violaceo-purpureis, longitudineliter inqui- 
natis, formose pictd. 
Conch. Jcon., Pectunculus, pl. 8. f. 48. 
Hab. ? 
There are two or three specimens of this handsome shell at Paris, 
both in the collection at the Jardin des Plantes and in that of 
M. Delessert. 
