ACM^EA. 51 



Interior white with a few flesh-colored spots ; border narrow, dot- 

 ted with pinkish. Length 31, breadth 27, alt. 8 mill.; a smaller 

 specimen measures, length 21, breadth 20, alt. 4i mill. 



Australia (Phil. Acad. Coll.) 



? P. stellaris REEVE, Conch. Icon. f. 114, not stellaris Q. &. G. 

 ? P. octoradiata HUTTON, Cat. Mar. Moll. N. Z. p. 44, 1873.? P. 

 stellaris (Q. & G.) HUTTON, Journ. de Conchyl. 1878, p. 37. 



It is with great doubt that I give the above synonymy for this 

 species or variety, for Hutton has never made clear what his octora- 

 diata really is ; referring it first to stellaris Q., and then omitting it 

 from his Manual of 1880. It is, however, fair to assume that in 

 1880 he included his specimen under the name P. stella Lesson. 

 Lesson's species is no doubt completely synonymous with Quoy's P. 

 stellaris ; and I, therefore, offer a new and definite appellation for 

 this form. The Patella stellaris Rv. (not Q. & G.) is an octo- 

 radiate limpet resembling somewhat the shells above described, but 

 not agreeing in characters with any of the specimens before me. 

 Reeve's figures are copied on pi. 36, figs. 65, 66. They should 

 be compared with certain varieties of Patella pentagona. 



Under whatever name this variety or species is ultimately placed, 

 it is well characterized by the number of ribs, which is constant in 

 the large suite before me, the rounded form of the ribs and their 

 striated surface. The interior does not have the dots characteristic 

 of A. stellaris Q. & G. The ribs are not carinated as in Patella 

 longicosta Linn., nor are interstitial riblets developed. Two ribs are 

 upon the central longitudinal line of the shell ; which is not the case 

 in .1. saccharina or A. stellaris. 



A. COSTATA Sowerby. PL 36, figs. 72-77. 



Shell solid, ovate, conical, apex a little in front of the middle ; 

 slopes convex or straight ; surface having 17 to 25 strong unequal 

 ribs, the ends of which denticulate the margin. 



Inside white, with a narrow gray border, often having black 

 scallops between the marginal projections ; the central area is more 

 or less clouded with brown, usually having a distinct outline. The 

 inner surface is sometimes stained with patches of livid purplish, 

 light olive or brown. Length 36, breadth 29, alt. 13 mill. 



South Australia ; Tasmania; Chatham Is. 



Lottia f costata SOWB., Moll, of Beechey's Voyage, p. 147, t. 39, 

 f. 2, 1839. Acmcea costata TENISON-WOODS, Proc. Roy. Soc. Tasm. 



