BY C. HEDLEY. 



713 



AcMyEA MIXTA Reeve. 



Patelloidea flammea Quoyik Gaimard, Zool. Astrolabe, iii., 1834, 

 p.354, Pl.xxi., figs. 15, 16, 21, 22; Patella jacksoniensis Reeve, 

 Conch. Icon., viii., 1855, PI. xxxix., fig.l27a, 6; (not Patella 

 jacksoniensis Lesson, Voy. Coquille, ii., 1830, p.418) ; Patella 

 mixta Reeve, op. cit., PI. xxxix., fig. 129, a, b. 



Patelloidea flammea Quoy & Gaimard, is a compound of two 

 species, one of which occurred on the beach at Hobart, and the 

 other at the island of Guam, in the Ladrone Archipelago. Ap- 

 parently figs. 15, 16, 21, and 22 with a subcentral apex, repre- 

 sent the Tasmanian form, but the other figures, 17, 18, 19, 20, 

 with an anterior apex, relate to the Guam species. 



As the Tasmanian has other names, while the Guam species 

 has nob, it will be proper to leave the name flammea for the 

 Ladrone shell, and employ one of the alternatives for the Hobart 

 species. Apparently Patella jacksoniensis and P. mixta stand 

 next in order, but as the former is disqualified by P. jacksoniensis 

 Lesson, the adoption of A. mixta is recommended. 



ACMiEA MUFRIA, Sp.nOV. 



(Plate Ixxxi., figs.50, 51, 52.) 



Shell rather solid, variable in form, usually elevated and 

 narrow, about as high as broad, and twice as long, the apex in 

 advance of the centre. Colour bufi", irregularly rayed with brown, 

 usually the apex, interstices of ribs and central interior being 

 brown. Radial ribs varying from twenty to thirty, low and 

 broad, parted by narrow interstices; in youth, the ribs opaque 

 and interstices translucent. Fine concentric threads overrun 

 ribs and interstices. Muscle-scars distinct. Length, 5*5; breadth, 

 3; and height, 3 mm. Another specimen, length, 8; breadth, 5; 

 and height, 4 mm. 



Hah. — In the rough crust of Galeolaria coispitosa, a gregarious 

 annelid, A. mufria is common. I have found it dead frequently 

 in shell-sand at Balmoral Beach, Middle Harbour, and at Wreck 

 Bay, N.S.W. 



The relatively coarse radials, narrow elevated form and forward 

 apex, part this from the young of A. mixta Reeve. 



