PECTUNCULUS. 



Plate VII. 



Species 36. (Mus. Cuming.) 



Pectunculus spurcus. Pect. testd subquadrato-ovali, 

 gibbd, glauco -fused, longitudinaliter costatd, costis 

 numerosis, angustis, subtilissime striatis ; umbonibus 

 dlbicantibus, obliquis. 



The dirty Pectunculus. Shell squarely oval, gibbous, 

 greyish brown, longitudinally ribbed, ribs numerous, 

 narrow, and very finely striated ; umbones whitish, 

 oblique. 



Reeve, Pro. Zool. Soc, 1843. 



Hub. Bay of San Carlos (found in coarse sand at the 

 depth of sixteen fathoms) ; Cuming. 

 The width of this little species from the umbones to 



the margin is comparatively shorter than that of any 



other species. 



Species 37. (Mus. Cuming.) 



Pectunculus pertusus. Pect. testd orbiculari, ulbd, 

 fusco undatim pictd ; radiatim costatd, costis subtilis- 

 sime pertusis ; umbonibus centralibus. 

 The pricked Pectunculus. Shell orbicular, white, 

 painted with brown waved spots ; radiately ribbed, 

 ribs very finely pricked ; umbones central. 

 Reeve, Pro. Zool. Soc, 1843. 



Hab. Islands of Mindanao and Luzon, Philippines (found 

 in coarse sand at the depth of ten fathoms) ; Cuming. 

 This interesting little species presents a marked peculi- 

 arity in the ribs being finely pricked on each side. Two 

 or three specimens only were collected by Mr. Cuming 

 at the above-mentioned islands. 



Species 38. (Mus. Cuming.) 



Pectunculus oculatus. Pect. testd sub- Pect iniformi, 

 radiatim costatd, fused, maculis albis, superne nigro- 

 marginatis, sparsim et irregular iter ornatd ; umbo- 

 nibus centralibus, subobliquis. 



The eyed Pectunculus. Shell somewhat Pecten- 

 shaped, radiately ribbed, brown, sparingly and irre- 

 gularly ornamented with white spots or spaces bor- 

 dered round with dark brown ; umbones central but 

 rather oblique. 



Reeve, Pro. Zool. Soc, 1843. 



Hab. West Indies. 



The ground-colour of this shell being a very dark 

 chestnut-brown, the scattered white spots or spaces 

 have a very prominent appearance. Since the specimen 

 above described was figured, M. Deshayes has kindly 

 lent me a specimen in which the white spaces are con- 

 siderably larger and more characteristic ; and I have 

 also had the pleasure of examining a specimen of exceed- 

 ing beauty, in the collection of M. Delessert, whose 

 kindness in allowing me to have a drawing made of it 

 was unfortunately too late to be of service. 



Species 39. (Mus. Cuming.) 

 Pectunculus cancellatus. Pect. testd oblique. Pectini- 

 formi, striis subtilissime cancellatd; alba, epidermide 

 luted holosericd partim indutd ; umbonibus prominen- 

 tibus, centralibus. 

 The cancellated Pectunculus. Shell obliquely Pec- 

 ten-shaped, finely cancellated with striae ; white, 

 partially covered with a yellow silken epidermis ; 

 umbones prominent, central. 

 Reeve, Pro. Zool. Soc, 1843. 



Hab. Singapore (found in sandy mud at the depth of 

 seven to ten fathoms) ; Cuming. 

 This little shell is very thin and fragile, and perfectly 

 white ; the entire surface being delicately cancellated 

 and covered towards the margin with a thick pale yellow 

 epidermis. There is no possibility of confounding it 

 with any other species. 



Species 40. (Mus. Metcalfe.) 

 Pectunculus morum. Pect. testd sub-Pectiniformi, 

 pallidipurpureo-rubrd, maculis rubidis elongatis spar- 

 sim et irregulariter pictd ; radiatim costatd, costis 

 lavibus ; umbonibus subcentralibus . 

 The mulberry Pectunculus. Shell somewhat Pecten- 

 shaped, pale pink, sparingly and irregularly painted 

 with long ruddy spots ; radiately ribbed, ribs smooth, 

 umbones nearly central. 

 Reeve, Pro. Zool. Soc, 1843. 

 Hub. Madagascar ? 



A very pretty species, in which the ribs radiate some- 

 what more obliquely than usual ; the general appear- 

 ance of the shell is not much unlike that of the P. tes- 

 sellatus ; it is however lighter and more depressed, with 

 colour and spotting of somewhat different character. 



June 1843. 



