A V I C U L A. 



Species -i. (5Ius. Cuming.) 



AvicULA FLEXUOSA. Avic. testa iubquadratd, tenuiculd, 

 compressa, suhdistorti, valde incsquilaterali, superni 

 recta, postice vix alatd, longitudinaliter Jiexuose squa- 

 matd, sqiianm partis, plants, cmpidatis, hie illic ohso- 

 letis, ref/ulariter descen-denlibm. 



The flexuous Avicula. Shell somewhat square, rather 

 thin, compressed, somewhat distorted, very inequi- 

 lateral, straight at the upper part, scarcely winged 

 posteriorly, longitudinally flexuously scaled, scales 

 small, flat, cuspid, here and there obsolete, descend- 

 ing regularly. 



Hal>. Cape Hillsborough, North Australia ; Jukes. 



A shell of somewhat square growth, having rather a 

 distorted appearance, sculptured with small cuspid scales 

 descending in comparatively distant flexuous rays. 



Species 5. (Mus. Cuming.) 



.\viuuLA LATA. Avic. testa transverse oblongo-quadratd, 

 suddistortd, valde inaquilaterali, postice parum alatd, 

 late sinuatd, concentrice dense filo-striatd, intense rufo- 

 CMtaned, squamulis minutis, irregulariter curcatis, 

 versus marginem concentrice indutd. 



The broad Avicula. Shell transversely oblong-square, 

 rather distorted, very inequilateral, but little winged 

 posteriorly, broadly sinuated, concentrically densely 

 thread-striated, dark reddish-chestnut, covered to- 



wards the margin with close-set irregularly festooned 



minute scales. 

 Gray, MS., Brit. Mus. 

 Hab. Port Essington and Raines' Island, Torres Straits, 



Australia ; Lieutenant luce. 

 An extremely characteristic species, of a peculiar red- 

 dish-chestnut colour, sculptured throughout with close-set 

 thread-like concentric strife of growth, and covered to- 

 wards the margin with minute irregularly festooned scales, 

 which have the appearance of a dense pile. 



Species G. (Mus. Cuming.) 

 Avicula Cumingii. Avic. testa orbiculari, piano-con- 

 vexd, superne recta, postice vix sinuatd, iibique concen- 

 trice et longitudinaliter sqiiamatd, squavm longitudi- 

 7ialibtts crispato-spathulatis, valde promiscuis, intense 

 virescente-olivaced, pallide radiatd. 

 Cuming's Avicula. Shell orbicular, flatly convex, 

 straight at the upper part, scarcely sinuated poste- 

 riorly, everywhere concentrically and longitudinally 

 scaled, longitudinal scales crispately spathulate, very 

 promiscuous, dark greenish-olive, faintly rayed. 

 Uab. Lord Hood's Island, Pacific Ocean (attached to 

 rocks, at the depth of ten fathoms) ; Cuming. 

 This fine species is quite remarkable for the dense forest 

 of scales with which it is sculptured throughout, the scales 

 being of an irregular crispately spathulate growth, deve- 

 loped in the most fantastic and promiscuous manner. 



March, 1857. 



