PEC TUN C U LU S. 



Plate III. 



Species 10. (Mus. Cuming.) 



Pectunculus longior. Pect. testa ellipticd, albicante, 

 rubido-fuscescente, parce variegatd aut radiatd, latere 

 postico breviore, ferrugineo lathis biradiato ; intus 

 albicante, purpurascente-brunneo paululum infectd. 

 The longer Pectunculus. Shell elliptical, whitish, 

 sparingly variegated or rayed with reddish brown ; 

 posterior side shorter, vividly marked with two 

 broad ferruginous rays ; interior whitish, a ^little 

 stained with reddish purple. 

 Sowerby, Pro. Zool. Soc, 1S33, p. 196. 

 Hab. Coast of Brazil ; T. Miller, R.N. 



The above description, though sufficient to distin- 

 guish this shell from any other species, cannot be en- 

 tirely relied upon ; for it is only known by odd valves 

 very much polished. 



Species 11. (Fig. a and b, Mus. Cuming.) 



Pectunculus Pectiniformis. Pect. testd lenticulari, de- 

 presso convexd, radiatim costatd, albicante, ?nacit/is 

 fuscis subquadratis, lineisque list is plus minusve va- 

 riegatd ; intus fusco varie tinctd. 



The Pecten-shaped Pectunculus. Shell lenticular, 

 depressly convex, strongly ribbed, ribs radiating 

 from the umbones ; whitish, more or less variegated 

 with cross burnt lines and squarish brown spots ; 

 interior variously stained with brown. 



Variety a. (Fig. 11 a.) 

 Testa costis subnodulosis aut Uratis. 

 Shell with the ribs nodulated or ridged. 

 Lamarck, Anim. sans vert., vol. vi. p. 41)4. 



Area Pectunculus, Linnaeus, Syst. Nat., p. 1 142. 

 Chemnitz, Conch., vol. vii. pi. 58. f. 568 and 569. 

 Hab. Island of Masbate, Philippines ; Cuming. 



Variety ft. (Fig. 1 1 b.) 

 Testa major, costis latioribus, maculis scepissime ctsruleis. 

 Shell larger, ribs wider, spots generally bluish. 

 De Blainville, Man. de Malac.,pl.65.f.3; Enc. Meth., 



pi. 311. f. 5. 

 llab. Island of Ticao, Philippines; Cuming. 



Sptcies 12. (Fig. a and b, Mus. Cuming.) 



Pectunculus glycimebis. Pect. testd ovato-orbiculari, 

 iiuequilaterali, den essi a nvexd, versus cardinem at- 



tenuate, antice plus minusve angulatd, transversim 



et longitudinaliler striatd ; pallidi carneo/d, maculis 

 rubris angularibus variegatu, epidermide pilosd prop'f 

 ad marginem indutd. 



The sweet-savoured Pectunculus. Shell ovately 

 orbicular, attenuated towards the hinge, inequilate- 

 ral, depressly convex, more or less angulated an- 

 teriorly, transversely and longitudinally striated ; 

 pale flesh-colour, variegated with angular red spots, 

 and covered near the margin with a soft hairy epi- 

 dermis. 



Turton, Conch. Ins. Brit., p. 171. pi. 12. f. 1. 



Macgillivray, Moll. Aberdeen, p. 338. 

 Area yli/cimeris, Linnaeus. 



Hab. Coasts of Britain. 



The specimens here figured are selected as extreme 



varieties of the species, and to show how greatly this shell 



varies in form, though always preserving its anterior 



angulation. That represented at Fig. a. was dredged 



up off Falmouth, and the latter was picked up by Mr. 



Cuming alive after a gale of wind on the west coast of 



Cornwall. 



Two species seem evidently to have bt 



under this title : Pectunculus glycimeris, of Lan . 



is Pectunculus Siculus mihi. 



Species 13. (Mus. Cuming.) 



Pectunculus tilosus. Pect. testd orbicular!, tequila- 



terali, tumido-convexd, decussatim subtilissime striatd, 



fttscescente, fusco-variegatd, epidermide crassd pi/osii 



indutd. 

 The hairy Pectunculus. Shell orbicular, equilateral, 



tumidly convex, very finely decussately striated, 



brownish, variegated with darker brown, covered 



with a thick hairy epidermis. 

 Lamarck, Anim. sans vert., vol. vi. p. 2 ; Enc. Meth., 



pi. 310. f. 2. 



Area pilosa, Linnaeus. 

 Varieties : 



Area undata, Linnaeus. 



Pectunculus marmoratus, Lamarck. 

 Hab. Mediterranean, Coast of Sicily. 



This species is rounder and more tumid than the 

 ceding, and is always of a darker colour ; it never ex- 

 hibits any anterior angulation, and the epidermis is 

 thicker and softer. 



March 1843. 



