A V I C U L A 



Plate X. 



Species 29. (Fi-. 29 and 31, Miis. Cuming.) 

 AviCDLA LACCNATA. Mic. kst/i mbquadrato-ovatd, cou- 

 vexittsciild, tenui, lutescente-corned, compicue dense 

 laminatd, laminis in spinis lacunatis Jimbriatis pro- 

 jects. 

 The guttered Avicula. Siicll somewhat squarely ovate, 

 rather convex, thin, yellowish-horny, conspicuously 

 densely laminated, the laminae projecting into fes- 

 tooned guttered spines. 

 Hah. Australia. 



Tlie surface of this species is remarkable for its very 

 elaborate system of horny lamina;, projected into fes- 

 tooned guttered spines. 



Species 30. (Mus. Cuming.) 

 Avicula irrasa. Avk. testa suicircular/., temnculd, 

 corned, concentrice lamlnato-striatd, deinde sjiiamis 

 angustis plants dense regulariter obsitd, pallide spa- 

 diceo-rufd. 

 The unshorn Avicula. Shell nearly circular, rather 

 thin, horny, concentrically laminately striated, then 

 densely regularly beset with flat narrow scales, light 

 fawu-red. 

 JM. ? 



A light nearly circular species, of a delicate fawn-red 

 colour, thickly rayed with close-set flattened narrow scales. 



Species 33. (Mus. Cuming.) 



Avicula .-erata. Jvic. testa subquadratd, tenuicidn, 

 coHvexd, prasertim valvd dextrd, postice subsinmld, 

 areo-lutescente, obsolete tenuilamimtd, squamis tmui- 

 bus nunwrosis parvis plants marmoratis obsitd. 



The bronze Avicula. Shell somewhat square, rather 

 thin, conve.x, especially the right valve, posteriorly 

 slightly siuuated, bronze - yellow, obsoletely finely 



laminated, beset with numerous small thin Hat mot- 

 tled scales. 

 Ilab. Australia. 



Chiefly distinguished by its yellowish-bronze hue, thin 

 in substance, and regularly beset with small flat mottled 

 scales. 



Sjiecies 33. (Fig. 33 and 31, Mus. Cuming.) 



Avicula NEBULOSA. Jvic. testa oblique quadratd, coii- 

 vexiusculd, prasertim valvd dextrd, soUdiuseuld, postice 

 subsinuatd, intus vivide margaritaced, extus rugosd, 

 muticd, sordide alba, nigro profuse uebulosd. 



The clouded Avicula. Shell obliquely square, rather 

 convex, especially the right valve, rather solid, pos- 

 teriorly slightly sinuated, richly pearly in the interior, 

 externally rough, without sculpture, dull white, pro- 

 fusely clouded with black. 



Conrad, Journ. Acad. Nat. Soc. Philadelphia, vol. vii. 



Hab. Sandwich Islands. 



A rather solid black clouded species, void of any ex- 

 ternal sculpture, remarkable for the rich delicate golden 

 hue of its internal nacre. 



Species 35. (Mus. Cuming.) 

 Avicula irradians. Avic. testa sub-Pectiuiformi, irre- 

 gulari, planiusculd, lavigatd vel obsolete laminatd 

 circa umbones, deinde rude squamatis, squamis cris- 

 patis, valde irregularibus ; albidd, rufo-radiatd. 

 The R.4.YED Avicula. Shell somewhat Pecten-shaped, 

 irregidar, rather flat, smooth or obsoletely laminated 

 around the umboes, then rudely scaled, scales crisp, 

 very irregular; whitish, rayed with red. 

 Hab. Australia. 



An irregularly formed species, of 

 a characteristic manner with red. 



itish hue, rayed in 



March, IS 57. 



