]M D I L A . 



Plate VI. 



Species 25. (Mus. Cuming.) 

 MoDioL.^ PLICATA. Mod. Ustd ohlongo-naviformi, tenui- 

 r.uld, latere postico brevi, tumidiusculo,rotundato, liris 

 brcvibus subdistantibus rugato, antico compresse dila- 

 lato, margine angulato-producto ; subpellucidd, epider- 

 mide tenui corned olivaceo-castaned nitente indutd. 



The plicated Modiola. Shell oblong-boat-shaped, ra- 

 ther thin, posterior side short, rather swollen, rounded, 

 wrinkled with rather distant short ridges, anterior 

 side eompressly dilated, angularly produced at the 

 njargin; semitrausparent, covered with a shining, 

 olive-chestnut, horny epidermis. 



Lamarck, Anim. sans vert. vol. vii. p. 25. 



M^/iliis piieatits, Gmelin. 



Hab. West Africa. 

 A very light, broad, rather compressed shell, delicately 



plicately wrinkled. 



Species 26. (JVIus. Cuming.) 



IVLodiola Japonica. Mod. testa cylindraceo- 



gmta, tenui, lateribus roiundatis, postico brevissimo, 

 altenuato ; pellucido-virescente, roseo-pnrpureo concen- 

 trice undatd. 



The Japan Modiola. Sliell cylindrically oblong, nar- 

 row, sides rounded, posterior very short, attenuated ; 

 transparent green, conceniiically waved with rose- 

 purple. 



f'olsdta Japonica, Dunker, Pro. Zool. Soc. 1S56, p. 363. 



Hab. Japan. 



A slender shell, very elegantly painted. 



Species 27. (Mus. Cuming.) 

 Modiola akcuatula. Mod. testa arcuato-eloiigatd, sub- 

 angustd, 'medio valide gibboso-angulato, latere postico 

 parvo, antico subjlabellato ; pellucido-corned, purpureo 

 irregnlariter undatd. 



The arched Modiola. Shell arouately elongated, ra- 

 ther narrow, strongly gibbously angled in the middle, 

 posterior side small, anterior somewhat fan-shaped ; 

 transparent horny, irregularly waved with purple. 



Hanley, Pro. Zool. Soc. 1S44. 



Modiola varicosa, Gould. 



Hub. Singapore and Philippine Islands. 



Chiefly distinguished by its arched form and gibbously 



angled growth. The painting consists of purple vein-like 



stains of irregular |)attern, upon a semitrausparent horny 



ground. 



Fig. 28. (Mus. Cuming.) 

 Modiola rhomboidea. Mod. testa elongato-rhomboided, 

 tenuiculd, latei-e postico brevi, rotundato, antico valde 

 elongato, margine compresse angulato ; nitente luteo- 

 castaned, postice obscure saturate fasciatd. 



The rhomboid Modiola. Shell elongately rhombo: 

 rather thin, posterior side short, rounded, anteri 

 very elongated, eompressly angled at the margi 

 shining yellowish-chestnut, obscurely darker banded 

 on the posterior side. 



Hanley, Species Recent Shells. 



Hab. The Gambia, West Africa. 



An elegantly-formed species of very simple character, 



beyond the concentric lines of growth inclining to become 



corrugated on the median angular ridge and beneath the 



umboes. 



Fig. 29. (Mus. Cuming.) 

 The specimen here figured is a fine characteristic exam- 

 ple of M. elegans, represented in the preceding Plate. 



Species 30. (Mus. Cuming.) 

 Modiola arborescens. Mod. testa subcglindraceo-ob- 

 longd, tenui, compresse comexd, IcBvigatd, lateribus 

 roiundatis; Ititescente-albd, ferrugineo-tinctd, antice 

 lineis tenuibus nigricantibm irregnlariter dense divari- 

 catim reticulata. 



The arborescent Modiola. Shell somevyhat cvUn- 

 drically oblong, thin, eompressly convex, smooth, sides, 

 rounded; yellowish-white, stained with rust, ante- 

 riorly irregularly densely divaricately netted with fine 

 blackish lines. 



Mytilus arborescens, Chemnitz, Conch. Cab. vol. ii. pi. 198. 

 f. 2016-17. 

 Modiola picta, Lamarck. 



Hab. West Indies. 



Peculiarly distinguished by its arborescent pattern of 

 network on the anterior side. 



Fig. 31. (Mus. Cuming.) 

 This dark-coloured shell, tinged on the anterior side 

 with bronze-green, is the typical M. Brasiliensis from 

 Brazil. The light-coloured specimen represented at PI. IV. 

 Fig. 17, is a variety from Guayaquil. 



