44 AGIOS A. 



A. SCHRENCKII Lischke. PI. 2, figs. 21, 22, 23, 24. 



Shell elliptical, much depressed, rather thin. The apex is 

 situated between the front sixth and eighth of the shell's length ; 

 posterior slope convex, its curve generally higher than the apex. 

 Sculptured with very fine, unequal thread-like riblets, which are 

 very closely granose ; of an olive-ashen color, variously marbled 

 with blackish-olive. 



Inside light blue with a broad blackish border and an ill-defined 

 dark chestnut central area. 



Length 31, breadth 22-24, alt. 4-6 mill. 



Ojima and Nagasaki, Japan. 



P. sehrenekii LISCHKE, Mai. Blat. xv, p. 220 ; Jap. Meeres-Con- 

 chyl. i, p. 107, t. 8, f. 1-4. Tectura schrenckii DKR., Ind. Moll. 

 Mar. Jap., p. 155. 



My description is drawn from typical specimens collected at 

 Ojima by Mr. Frederick Stearns. The species is variable in mark- 

 ings, the mottling sometimes being converted into stripes obliquely 

 radiating and curving from the central dorsal region. It is closely 

 allied to P. eoncinna, but is of a longer elliptical outline, is more 

 depressed, and the granulation is finer. Still, I am disposed to 

 believe that the two will be united when fuller collections are made. 



A. CONCINNA Lischke. PI. 2, figs. 12, 13, 14, 15, 16, 17. 



Shell oval, rather thin ; apex at the front fifth or sixth of the 

 shell's length; posterior slope convex. Surface sculptured with 

 close fine unequal riblets, finely and distinctly granulose ; of a uniform 

 blackish-olive shade, or variegated with olive, green or brown on a 

 very light green ground. 



Inside light blue, with a wide dark or spotted border, and an ill- 

 defined central darker tract. Length 24, width 20, alt. 6 mill. 



Yokohama to Enophima, Japan. 



P. eoncinna Lischke, Mai. Bl. xvii, p. 25 ; Jap. Meeres-Conchyl. 

 ii, p. 98, t. 6, f. 1-6. Tectura eoncinna DKR., Ind. Moll. Mar. Jap. 

 p. 154. P. granostriata SCHRENCK, Amurl. Moll. t. 14, f. 1-3. 



Closely allied to A. schrenckii, probably a variety of that species, 

 but rounder, more elevated, more distinctly granulose. These 

 Japanese forms have much in common with A. scabra of the Cali- 

 fornian coast, but they are abundantly distinct in sculpture, the 

 position of the apex, and the general tone of coloring. 



