MODIOLA. 



Plate II. 



Species 4. (Mus. Cuming.) 



MoDIOLA ELONGATA. Mod. tests, elongato-trapeziformi, 

 mbangmtd, tenui, latere postico subimpresso-arcuato, 

 antico carinato-produclo ; nU.eute-castaned, olivaceo- 

 luteo tinctd, imdique conceritrice striata. 



The elongated Modiola. Shell elongately trapeziform, 

 rather narrow, thin, posterior side rather irapressly 

 arched, anterior produced into a compressed keel: 

 shining chestnut, stained with olive-yellow, concen- 

 trically striated throughout. 



SwAiNsoN, Exotic Conchology, Second Edition, p. 81. f. S 



Rab. Moluccas. 



A delicate glossy fulvous-chestnut shell, of light sub- 

 stance, elegantly produced in form. 



Fig. 5. (Mus. Cuming.) 

 This fine shell proves on examination to be a specimen 

 of very advanced growth of M. tulipa, described at PI. IV. 



Species 6. (Mus. Cuming.) 



Modiola nitida. Mod. testa elongato-oUoiigd, subcur- 

 mtd, tenuiculd, tiimidd, concentrice striata, nitente- 

 castaned, fulvo tinctd, latere postico recto, antico ver- 

 sus extremitalem subjlabelliformi. 



The shining Modiola. Shell elongately oblong, some- 



what curved, rather thin, swollen, concentrically stri- 

 ated, shining-chestnut, fulvous-tinged, posterior side 

 straight, anterior a little fan-shaped towards the ex- 

 tremity. 



Hab. Port Essington, New Holland. 



This pretty glossy species resembles M. elvngata, but 



more foreshortened, with the anterior side less produced 



into a keel. 



Species 7. (Mus. Cuming.) 



Modiola albicosta. Mod. testd subtrigono-oblongd, so- 

 lidiuscttld, valde tumidd, latere postico subimpresso- 

 arcuato, antico superne producto, Quasi alato ,- intense 

 castaned, obscure fulvo-radiatd. 



The white-kibbed Modiola. Shell somewhat trian- 

 gularly oblong, rather solid, very much swollen, pos- 

 terior side rather impressly arched, anterior side pro- 

 duced at the upper part, as if winged ; dark-chestnut, 

 obscurely fulvous-rayed. 



Lamarck, Anim. sans vert. vol. vii. p. 19. 



Hab. Tasmania. 



We are indebted to the beautiful work of M. Delessert 



for being able to identify this species. The character 



which suggested to Lamarck the name " white-ribbed " 



arose apparently from the epidermis beit)g worn off the 



prominent central ridge of the shell. 



August, 1857. 



