AVICULA. 



Plate IX. 



Species 25. (Mus. Cuming.) 



AvicuLA FIMBRIATA. Avic. te.stu, subqiiodrato-ovatd, su- 

 perne lata, tcnui, planiusculd, Ifevigatd, irreyulari, 

 squamis laminaribus versus marginem late fimbriatd, 

 pallide spadked. 

 I'he fuebelowed Avicola. Shell somewhat squarely 

 ovate, broad at the upper part, thin, rather flat, 

 smooth, irregular, broadly furbelowcd towards the 

 margin with laminar scales, pale ftiwn-eolour. 

 Hab. North-west coast of Australia (uuder pieces of coral 

 at low water) ; J. E. Dring. 

 Of rather sliglit irregular structure, thin and flat, orna- 

 mented towards the margin with conspicuous rows of 

 brnadlv frilled lamina?. 



Species 26. (Mus. Cuming.) 



Avict'LA Anomioides. Avic. testa siibcirculari, siib-Pec- 

 tiniformi, tenui, lavigald, pelliicido-albd, vircsceide 

 pallide radiatd, ad marginem obsolete rugoso-laminatd. 



The Anomia-like Avicula. Shell nearly circular, some- 

 what Pecten-shaped, thin, smooth, transparent-white, 

 faintly rayed with pale green, obsoletely roughly la- 

 minated at the margin. 



Uab. ? 



A very characteristic species, of semitransparent white 



Anomia-like substance, rayed with pale green in a manner 



very unusual in this genus, the edge being rudely jagged 



with short broken laniiiiffi. 



Species 27. (Mus. Cuming.) 

 ICULA SIGILLATA. Avic. iestd subquadrato-ovtttd, irre- 



gulari, lavigatd, pelliwido-albd, purpureo-nigricante 

 circa umbones tinctd et radiatd, fasciis opaco-albis 

 prope marginem radiatd, ddnde laminis planis fim- 

 briatd. 

 The bruised Avicula. Shell somewhat squarely ovate, 

 irregular, smooth, transparent-white, rayed and 

 stained about the umboes with purple-black, rayed 

 near the margin with opake-white bands, then frilled 

 with flat laminse. 

 Hab. Cape Hillsborough, North Australia ; Jukes. 



This shell is of the same transparent white Anomia-Hke 

 substance as the preceding species, but differs materially 

 in form, and is more or less stained with purple-black. 

 Near the margin it is curiously marked with opake-white 

 radiating bands, and at the edge is broadly flatly frilled. 



Species 28. (Mus. Cuming.) 



Avicula cetua. Avic. te.'itd subqitadratd, siipeme latis- 

 simd, Icevigatd, sordide spadiced, irregulariter obsolete 

 laminatd, versus marginem dense radiatim squamatd, 

 sqitamis minutis, plants, cuspidatis, subdistantibus, pe- 

 cidiariter marmoratis. 



The shield Avicdla. Shell somewhat square, very 

 broad at the upper part, smooth, dirty fawn-colour, 

 irregularly obsoletely laminated, towards the margin 

 densely radiatcly scaled, scales minute, flat, cuspid, 

 rather distant, peculiarly mottled. 



Eab. ? 



The chief characteristic of this thin broadly square spe- 

 cies is its sculpture of minute flat cuspid mottled scales, 

 arranged in regular radiating rows. 



March, 18.5 7. 



