M D I L A. 



Species 12. (Mus. Cuming.) 



MoDioL.v .4RATA. Mod. testd cylindraceo-obloiujd, suban- 

 i/iistd, rotundato-gibbosd, tenuiculd, fulco-castaned, 

 undique nilide coiwentrice fih-striatd, latere postico 

 contracto, antico carinato-producto, ad fxtremilatem 

 decUvi-angulato. 



Thk furrowed Modiola. Shell cylindrically oblong, 

 ratlier narrow, rotundately gibbous, rather thin, ful- 

 vous-chestnut, neatly concentricaUy thread-striated 

 throughout, posterior side contracted, anterior pro- 

 duced into a keel, which is slopingly angled at the 

 extremity. 



Dl'Nker, MS. in Mus. Cuming, 



Hab. North Australia. 



This interesting species is characterized by the homy 



epidermis, forming a beautiful concentric series of raised 



striae. 



which, however, as in the specimen figured at PI. II. 

 Fig. 5, becomes more obscure with age. 



Species 13. (Fig. 13 and 14, Mus. Cuming.) 



Modiola Traillii. Mod. testa obloyigo-JlabelUformi, mb- 

 rude concentrice striatd, latere postico plano-impresso, 

 lafusime gibboso, antico declki-eompresso, interdum 

 niargine angulalo-producto ; vivide castatted. 



Traill's Modiola. Shell oblong fan-shaped, rather 

 roughly concentrically striated, posterior side flatly 

 impressed, very gibbous, anterior side slopingly com- 

 pressed, sometimes angularly produced at the margin ; 

 bright chestnut. 



Bob. Malacca; Dr. Traill. 



Remarkable for the very gibbous development of the 



posterior side of the shell. 



Species 15. (.Mus. Cuming.) 



Modiola tdlipa. Mod. tentd obhngd, tenuiculd, ventri- 

 cosd, laterepostico .iubcoitracto, antico declim-producto, 

 undique subtilissimi concentrice striatd; aurantio-lu- 

 ted, rufo-ca-staneo plus niimi.f radiatd. 



The tulip Modiola. Shell oblong, rather thin, ven- 

 tricosc, posterior side somewhat contracted, anterior 

 slopingly produced, everywhere very finely concentri- 

 cally striated ; orange-yellow, more or less rayed with 

 reddish-chestnut. 



Lamarck, Anim. sans vert. vol. vii., p. 18. 



Hab. West Indies. 



Generally distinguished by its prettily-rayed painting. 



Species 16. (Fig. a, b, Mus. Cuming.) 

 Modiola Metcalfei. Mod. testa subtrigono-oblongd, 

 angustd, ventricosd, leevigatd aut subtilisgime striatd, 

 latere postico recto, paulo coarctato, antico in alam 

 compressam angulato-prodticlo ; luteo-castaned, fascia 

 cisruleo-purpurascente ab umbone radiatim descendente; 

 interdum epidermide pilosd versus margine-m indutd. 

 :Metcalfe's Modiola. SheD somewhat triangularly ob- 

 long, narrow, ventricose, smooth or very finely stri- 

 ated, posterior side straight, a little contracted, an- 

 terior angularly produced into a compressed wing ; 

 yellowish-chestnut, with a bluish-purple band, radi- 

 ately descending from the umbo ; sometimes covered 

 towards the margin with a hairy epidermis. 

 Hanley, Pro. Zool. Soc., 1844; Cat. Recent Bivalve 



Shells, p. 235. 

 Ilab. Philippine Islands ; Cuming. 



The elegant keel-winged form of this shell is peculiar, 

 but its chief characteristic is the presence of a conspicu- 

 ous broad purple band, radiating from each umbo. 



Species 17. (Mus. Cuming.) 

 Modiola Brasiliensis. Mod. testd trigono-fiabelliformi, 

 latere postico subcontracto, Uevigato vel subtilisisime 

 striato, antico carinato, deinde late dilatato, et con- 

 centrice filo-striato ; ared posticd fulvo-castaned, an- 

 ticd vivide tsrugineo-viridi, punctis et lineis fexuosis 

 minutis lentiginosd. 

 The Brazilian Modiola. Shell triangularly fan-shaped, 

 posterior side somewhat contracted, smooth or very 

 finely striated, anterior keeled, then broadly dilated, 

 and concentrically thread-striated ; posterior area ful- 

 vous-chestnut, anterior bright metallic-green, freckled 

 with dots and minute flexuous lines. 

 Chemnitz, Conch. Cab. vol. ii. pi. 205. f. 2020 and 2021. 

 Modiola Guyanensis, Lamarck. 



Modiola semifusca, Sowerby. 

 Hab. Brazil. 



This very pretty species may be readily distinguished 

 by its striking contrast of colour, the posterior area being 

 a glossy fulvous-chestnut, almost smooth, while the poste- 

 rior is a bright pale metaUic-green, with the striae raised 

 in thread-like ridges. 



August, 1857. 



