ACM^EA. 49 



large, filling the cavity of the shell, muzzle broad, tentacles long 

 and fine, mouth not notched beneath. It does not appear to keep 

 to one place and form a hole for itself like some Patellse, but it is 

 very sluggish in its movements. (Blanfy ' 



The only specimen of this species which I have seen is in the col- 

 lection of Dr. W. H. Dall. It has the appearance of an ordinary 

 Acmcea of the type of A. striata Q. & G. 



A. BIRADIATA Reeve. PL 42, figs. 88, 89. 



Shell nearly orbicular, conoidly depressed, apex nearly central ; 

 radiately striately ridged ; whitish, rayed with blue-black near the 

 margin, conspicuously ornamented posteriorly with two broad, pale 

 bands ; interior vividly painted with the same color. (Reeve}. 



China Seas. 



P. biradiata RVE., Conch. Icon. f. 142. 



A. HIEROGLYPHICA Dall. PI. 33, figs. 77, 78, 79. 



Shell small, stout, rugged, with a sub-central, more or less eroded 

 apex moderately elevated. Muscular impression pyriform. Shape 

 of shell ovate; exterior with rather strong white ribs, 14-20 in 

 number, with riblets between them, interspaces brown. Stride of 

 growth somewhat imbricated, less prominent on the ribs. Internally 

 white, with brown maculae on the margin corresponding to the 

 brown interspaces of the exterior. Margin strongly crenulated. 

 Spectrum pyriforrn with the smaller end anterior, consisting of a 

 sharp black line forming a pyriform figure with three longitudinal 

 black lines inside of it. In the larger specimens these have a faint 

 bluish halo about them, but in the smaller they are simply black 

 on a white ground. The same figure of less size is conspicuous on 

 the outside of the eroded apex, soft parts unknown. (Dall.) 



Length 7, breadth 51, alt. 1J mill. 



China. 



A. hieroglyphica DALL, A. J. C. vi, p. 258, t. 17, f. 37. 



This little species of the A. spectrum group, has much resem- 

 blance to the Chilian species A. ceciliana. I have seen no specimen 

 but the type, which was found in a box of Chinese shells in a San 

 Francisco tea shop. 



A. SACCHARINA Linne. PI. 36, figs. 60, 61, 62, 78 ; pi. 18, figs. 31, 

 32; pi. 24, figs. 12,13. 



