CRASSATELLA. 



Plate III. 



Species 12. (Mus. Cuming.) 



iassatella KADiATA. Crass, testd arcuatd, valde iiue- 

 quilaterd, rostratd, carinatd ; superficie totalizer sul- 

 cata, sulcis latis, profundus ; vivide radiatd, radiis 

 ab mnbonibus divergentibus ; latere antico rotundato, 

 postico productissimo, acuminata. 



he radiated Crassatella. Shell curved, very ine- 

 quilateral, beaked, and carinated ; surface wholly 

 o-rooved, the grooves, which run transversely, being 

 broad and deep ; vividly radiated, rays diverging 

 from the umbones ; anterior side rounded, posterior 

 very much produced and pointed. 



owerby, Appendix Tank. Cat., p. n. 



eeve, Conch. Syst., vol. ii. pi. 44. f. 1. 



r ab. Island of Singapore. 

 Several specimens of this very interesting little shell, 



>gether with the soft parts, were brought home by Mr. 



uming from the island of Singapore, where he dredged 



lem from coarse sand in seven fathoms water. 



Species 13. (Mus. Cuming.) 



Irassatella ziczac. Crass, testd subtrigond, depressd, 

 hteold, epidermide tenui indutd; radiis biuis inter- 

 ruptis, ab umbonibus ad margines divergentibus, lineis 

 roseis, Jfexuosis, ubitjue pictd ; in/iis subrosacea ; la- 

 tere antico breviiulo, rotundato; postico subangulato; 

 lunuld utrinque radiis roseis vividi virgatd. 



rHE zigzag-marked Crassatella. Shell somewhat 

 triangular, depressed, yellowish, and covered with 

 a thin epidermis ; the surface of each valve painted 

 with a pair of interrupted rose-coloured rays, sur- 

 rounded with a number of zigzag lines ; interior 

 rose-tinted ; anterior side short and rounded ; poste- 

 rior rather angular ; lunule vividly striped on both 

 sides with rose-coloured rays, running transversely. 



Reeve, Proceedings Zool. Soc, 1842, p. 45. 



Hub. Island of Corrigidor, Philippines. 



Several specimens of this very pretty species, in dif- 

 ferent stages of growth, were dredged by Mr. Cuming 

 at the island of Corrigidor from coarse sand in six fa- 

 thoms water. 



Species 14. (Mus. Saul.) 



Crassatella triquetra. Crass, testd trigond, solidd, 

 rosaced, epidermide tenui indutd, transversim striata ■. 

 maculis roseis irregularibus vivide pictd ,• intits ro- 

 saced, versus marginem albicante ; margine tenuiter 

 cremduto ; lateribus subreclis, vix rotundatis ; lunuld 

 utrinque magnd, radiis roseis vivide virgatd. 



The three-cornered Crassatella. Shell triangular, 

 solid, pink, and covered with a thin epidermis ; 

 transversely striated, and vividly painted with a 

 number of irregularly pointed pink spots or blotches ; 

 interior pinkish, white towards the margin ; margin 

 slightly crenulated, sides nearly straight, scarcely 

 rounded ; lunule on both sides the hinge large, and 

 vividly painted with pink rays running transversely. 



Reeve, Proceedings Zool. Soc, 1842, p. 4G. 



Hub. ? 



Several specimens of this pretty little shell have lately 



made their appearance, but I cannot learn from whence. 



Its solid triangular form and bright warm rose-colour are 



peculiar and distinct features. 



Species 15. (Fig. a and b, Mus. Stainforth.) 



Crassatella subradiata. Crass, testd trigono-ovatd, 

 subeequilaterd, transverse suleald, griseo-fulvd, radiis 

 albis interruptis, obsoletis, maculis cuspidiformibvs 

 profuse omald ; lateribus ambobus rotundatis. 



The faintly-radiated Crassatella. Shell triangu- 

 larly ovate, nearly equilateral, transversely sulcated, 

 of a dingy yellow colour, profusely ornamented with 

 faint white rays and a number of dark arrow-headed 

 spots ; both sides of the shell rounded. 



Lamarck, Anim. sans vert. (Deshayes' edit.), vol. vi. 

 p. 111. 



Hub. South Seas, Lamarck. 



There is little doubt but that the shell I have here 

 figured is the Crassatella subradiata of Lamarck. Un- 

 fortunately he refers to no figure beyond remarking 

 that it has somewhat the aspect of the Mactra striata of 

 Chemnitz, vol. vi. pi. 22. f. 222. (Mesodema striata, Des- 

 hayes). 



Jan. 1843. 



