1904,] NATURAL SCIENCES OF PHILADELPHIA. 559 



valve there is a small erect anterior lamella, and a curved posterior 

 one. 



Length 7, alt. 5, diam. 2 mm. 



Hirado, Hizen. Figured specimens are No. 86,301, A. N. S. P., 

 from No. 914 of Mr. Hirase's collection. 



A peculiar, very asymmetrical little species, originally described 

 from China. Mijodora proxima Smith, 1880 {= triangularis "A. Ad." 

 Dkr., 1882), has also been taken by Mr. Hirase at Hirado, Hizen. 

 These two with M. fluduosa Gld. are the only species of the genus yet 

 reported from Japan. 

 Ostrea circumpicta n. sp. PI. XL, figs. 12, 13. 



The shells of this oyster are very irregular and rough, showing a 

 few radial ridges on the upper valve, and rough lines of growth-arrest. 

 Nearly the whole lower valve has been attached. The exterior is 

 gray or with some pm-ple pencilling. Both valves have long, projecting 

 beaks, and are usually about equally concave within. The interior 

 is bluish-white or dirty white, extensively olive-stained, and often 

 with some purple stains. The borders are smooth or nearly so near 

 the hinge, and smooth or finely, irregularly scalloped elsewhere, and 

 the distal and lateral margins are in part or wholly painted with a 

 rather wide border of purple or groups of purple lines. The length of 

 a well-grown shell is 87, breadth 56 mm. 



Hirado, Hizen. Types No. 80,448, A. N. S. P., from No. 500 of Mr. 

 Hirase's collection. 



0. inocquivalvis Sowb.,^ from :\radagascar and Mauritius, is similar in 

 internal coloring. 0. vitrefada Sowb.^ also resembles this species 

 somewhat, but that is conspicuously crenate wdthin. 



Area kobeltiana n. sp. PI. XL, figs. 16, 17, 18, 19. 



Area ocellata'! Kobelt, Conchylien Cabinet, Area, p. 87, PI. 24, figs. 1-4. 

 Not A . ocellata Reeve. 



This is a deep, narrow Area, with a strong diagonal keel and another 

 defining the posterior border of the ligament-area. The surface where 

 unworn is many-ribbed and densely hirsute, but this sculpture and 

 covering persists only at the edges of the specimens before me. The 

 ventral margin gapes rather widely. The wide ligament-area is marked 

 off into concentric lozenges by very numerous ligament-filled diagonal 

 broadly V-shaped sulci, of which I count 11 in a shell 44 mm. long, 

 17 in one 55 mm. long. The hinge-Hne is narrow, the teeth fine, close 



2 Coneh. Icon., XVIII, Ostrea, fig. 82. 



3 Conch. leon., XVIII, Ostrea, fig. 80. 



