A V I C U L A. 



Plate VI. 



Species 10. (Mus. Cuming.) 



AvicDLA ALA-PEKDlcis. Avic. testd subquadrato-orbl- 

 culari, oblique convexd, superne redd, postice anffulaio- 

 sinuaid, semipellucido-corned, purpureo-nifescmte ra- 

 diatd, undique dense sqimmatd, squamis trigono-lanceo- 

 latis, fragilibus, peculia?iter marmoratd. 



The paetridge-winq Avicula. Shell somewhat squarely 

 orbicular, obliquely convex, straight at the top, pos- 

 teriorly angularly siuuated, semitransparent, horny, 

 rayed with purple-red, densely scaled throughout, 

 scales triangularly lanceolate, fragile, peculiarly mot- 

 tled. 



Hab. West Indies. 



Of this horny species, delicately rayed with purple-red, 

 the scales are prominently festooned in their made of de- 

 velopment, whilst in substance and appearance they are 

 fragile and peculiarly mottled. 



Species 11. (Mus. Cuming.) 

 Avicula imbricata. Avic. testa subquadratd, planius- 

 culd, postice angulato-prodnctd, parum simiatd, oU- 

 vaceo-flavicante, undique dense imbricato-squamatd, 

 squamis cuspidatis, appressis, regularibus. 

 The imbricated Avicula. Shell somewhat square, 

 rather flat, posteriorly angularly produced, but little 

 sinuated, olive-yellow, everywhere densely imbri- 

 cately scaled, scales cuspid, appressed, regidar. 

 Hab. Philippine Islands ; Cuming. 



The scales of this species arc very numerous, flatly ap- 

 pressed, pointed, and of unusually regular growth. 



Species 12. (Mus. Cuming.) 

 Avicula mubicata. Avic. testd suboblique quadratd, 

 solidiusculd, leviter convexd, postice arcuato-sinuatd, 

 flavicante, marmorato-nigro interrupte strigatd, versus 

 marginem dense squamatd, squamis angulato-lanceo- 

 latis, regularibus. 

 The prickly Avicula. Shell somewhat obliquely square, 

 rather solid, slightly convex, posteriorly arcuately 

 siuuated, pale yellow, inteiTuptedly streaked with 

 mottled black, densely scaled towards the margin, 

 scales angularly lanceolate, regular. 

 Hab. Philippine Islands. 



The colouring of this species is characteristic, the sur- 

 face being of a yellowish cast, interruptedly rayed with 

 marbled-black, and the scales are prominently pointed. 



Species 13. (Mus. Cuming.) 



Avicula lentiginosa. Avic. testd subquadratd, postice 

 late brevi-alatd, parum sinuatd, planiusculd, spadiceo- 

 fuscescente, alho radiatim lentiginosa, irregnlariter 

 laminato-squamatd, squamis simplicibus, Jdc illic ob.su- 

 iHis. 

 The freckled Avicula. Shell somewhat square, pos- 

 teriorly broadly short-winged, but little sinuated, 

 rather flat, fawn-brown, radiately freckled with white, 

 irregularly laniinately scaled, scales simple, here and 

 there obsolete. 

 Hab. Moluccas. 



In this species the scales are only obscurely developed 

 with the iiTegular lamina; of growth. The colour of the 

 shell is a pale fawn-brown, distinguished by a character- 

 istic pattern of mottled-white rays. 



March, 1857. 



