PECTUNCULUS. 



Plate IV. 



Species 14. (Mus. Cuming.) 



Pectunculus farcipictus. Pect. testa suboblique cor- 

 datd, radiatim costatd, costis plants, in medio soph 

 sulcatis, costarum intersiitiis profundis ; alba, luteo- 

 castaned parce. variegatd; intusalbd, antice purpureo- 

 tinctd. 



The sparingly painted Pectunculus. Shell rather 

 obliquely heart-shaped, radiately ribbed ; ribs flat, 

 often grooved up the middle, interstices between 

 the ribs deep ; white, sparingly variegated with 

 yellowish chestnut undulated zones and patches ; 

 interior white, stained on the anterior side with 

 purple. 



Reeve, Pro. Zool. Soc, 1843. 



Hub. ? 



The ribs in this shell are peculiarly firm, and squarely 

 grooved out as it were, and they are often slightly rut- 

 ted about half-way up the middle. 



Species 15. (Mus. Cuming.) 



Pectunculus assimilis. Pect. testa suborbicidari-cor- 

 diformi, solidd, incequilaterali, altitudine longitudinem 

 superante ; gibbosd, radiatim sulcata, sulcis lirisque 

 striatis ; albd, fasciis jilitribus, rubido-brunneis, 

 acutissime undulatis, oblique pictd ; liris brunnescente 

 leviter tinctis. 



The assimilating Pectunculus. Shell somewhat or- 

 bicularly heart-shaped, solid, inequilateral, height 

 exceeding the length ; gibbous, radiately grooved, 

 srooves and intermediate ridges striated ; white, 

 obliquely painted with several very sharply undu- 

 lated reddish brown bands ; ridges faintly stained 

 with the same colour. 



Sowerby, Pro. Zool. Soc, 1832. 



Hub. Puerto Portrero, and Bay of Guayaquil, Central 

 America (found in sandy mud and gravel in from 

 eight to twelve fathoms); Cuming. 



This interesting species somewhat assimilates to the 

 following ; it differs however constantly both in form 

 and colour, it is more distinctly grooved too, and the 

 cross bands are narrower, more in number, and more 

 sharply undulated. 



Species 16. (Mus. Cuming.) 



Pectunculus in^equalis. Pect. testd subcordiformi, 

 solidd, obliqud, inaquilaterali , altitudine longitudinem 

 superante; gibbosd, radiatim striata, striis obtusis, 

 per costas vel fasciculos costi/ormes congestis, dis- 

 posals; intersiitiis striatis; albd, fasciis undulatis 

 quutuor quinisveferrugineo-nigerrimo-jnirpureotrans- 

 versim vivide pictd, costis roseo caru/coque plus mi- 

 nusve tinctis. 



The unequal Pectunculus. Shell somewhat heart- 

 shaped, solid, oblique, inequilateral, height ex- 

 ceeding the length, gibbous, radiately striated ; 

 stria? obtuse, ranged together in the form of ribs or 

 rib-like clusters, interstices striated ; white, vividly 

 painted across with four or five rusty black purple 

 bands, ribs more or less stained with pink and pur- 

 plish blue. 



Sowerby, Pro. Zool. Soc, 1832. 



Hab. Bay of Panama and Real Llejos (found in sandy 

 mud at the depth of ten fathoms) ; Cuming. 



This strikingly marked shell has been figured by 

 Wood (Ind. Test. Supp., pi. 2, Area, f. 11.) for the P. 

 pectiniformis. 



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



Pectunculus aurifluus. Pect. testd orbiculari-cor- 

 datd, inaquilaterali, radiatim costatd, costis obsolete 

 sulcatis; albd, transversim auriflud, antice maeulis 

 aureis nigerrimo-fusco marginatis. 



The gold-flowing Pectunculus. Shell orbicularly 

 heart-shaped, inequilateral, radiately ribbed, ribs 

 obsoletely grooved down the middle ; white, richly 

 painted with transversely flowing patches of bright 

 orange ; patches on the anterior half of the shell 

 edged with blackish brown. 



Reeve, Pro. Zool. Soc, 1843. 



Hab. Island of Capul, Philippines (found in coral sand 

 upon the reefs) ; Cuming. 



This new and beautiful shell may be easily recognised 

 by its very bright orange painting : the adult specimen 

 represented at Fig. a, compared with the younger, Fig. 

 b, is singularly higher in proportion, and the groove 

 running half-way up the ribs of the latter is quite obso- 

 lete in the former. 



March 1S43. 



