168 APPENDIX-ACM^EID^. 



ing a wide dark ray extending from apex to margin in front, and a 

 broader one behind. (Smith.) 

 Length 24, width 19, alt. 9 mill. 



Island of Fernando Noronho, off Brazil. 



Acmcea noronhensis SMITH, Journ. Linn. Soc. Lond. xx, p. 495, t. 

 30, f. 3, 3a (1891.) 



This species has a smoother surface than A. subrugosa, d'Orbigny 

 (==Lottia onychina Gould), from Rio Janeiro. Like that species, 

 however, it has in the interior a broad obscure ray from the apex to 

 the margin in front and a broader one at the opposite end. These 

 rays, however are more distinct in the present species than in the 

 Brazilian shell. The external radiating striae being very fine, do 

 not, as a rule, produce a crenulated margin, but in some instances 

 a slight crenulation occurs. The surface within the muscle scar 

 is almost black, forming a marked contrast to the pallid space be- 

 tween it and the black margin, shells found attached to rocks, when 

 placed upon a flat surface, rest upon the anterior and posterior mar- 

 gins only, so that the sides are slightly raised. (Smith.) 



SCURRIA ZEBRINA Lesson, (page 63.) 



Following Dall, I included " Patella concepcionensis Lesson " in 

 the synonymy of zebrina on page 63. Lesson described no such 

 species, his name being " concepsionis " ; and its pertinence to zebrina 

 is doubtful. See at foot of page 155, this volume. 



New Zealand Acmceidce. 



ACM.EA LACUNOSA Reeve (p. 52). 



Hutton omits this name from his latest revision of the New Zea- 

 landic Acmseids (Proc. Linn. Soc. N. S. Wales, ix, p. 372, 1884). 

 He considers A. corticata a good species. Figures 9, 10, 11 of my 

 plate 37 represent specimens of corticata received from Hutton, and 

 figs. 7, 8 of pi. 37 are Reeve's originals of lacunosa. 



A. CINGULATA Hutton (p. 53). 



Add to references : HUTTON, N. Z. Journ. of Sci. i, p. 477, 1883 ; 

 Proc. Linn. Soc. N. S. Wales, ix, p. 372. 



A. RUBIGINOSA Hutton (p. 53). 



This unfigured species I have not seen. It may = A. lacunosa. 

 Hutton considers Patella campbelli Filhol (Compt. Rend, xci, p. 



