1920.] NATURAL SCIENCES OF PHILADELPHIA. 323 



Ocean Island. Mokunianu. Kauai: Hanalei, Haena, Milolii, 

 Kalalau. Oahu: Honolulu Harbor, Mokapu Point, Kailua, Pau- 

 malu, Waimanalo, Kaneohe Bay, Laie. Molokai: Moomomi, 

 Kaina'u, Papohaku. Maui: Maalaea Bay, Kahului. Hawaii: Hilo. 



At Kainalu, Molokai, a set was taken having the shell very thin 

 and frail, the corrugation weakly developed. Length 17 mm. 



Congeria bryanae n. sp. 



The shell is triangular, very much inflated along the middle of its 

 length, the ventral side flattened and subtruncate, the posterior and 

 dorsal borders, beyond the hinge, broadly rounded. Sculpture of 

 very numerous radial riblets crossed by closer and narrower concen- 

 tric threads which are more prominent in the intervals. The color 

 is green or yellow, uniform or clouded in varying shades and tints, 

 often with some irregular, maculation of brown, or whitish and pale 

 yellow with vinaceous or pink maculation The interior is whitish, 

 more or less tinted with the external colors. The septum is small, 

 There are about 10 rather strong teeth in each valve, between beaks 

 and septum, and a group of elongated crenulations at the posterior 

 end of the hinge-line. The rest of the internal margin is delicately 

 crenul'ate. 



Length 6.5, width 4.3, diameter 5 mm. 



Length 11.2, width 6.6, diameter 6 mm. 



Oahu: Mokapu Point, Kailua, Paumalu, Rabbit Island (type 

 loc), Makapuu Point, Honolulu Harbor. Kauai: Mouth of Han- 

 alei River. Molokai: Moomomi. Laysan Island. Pearl and Her- 

 mes Reef (W. A. and E. J. Bryan). 



Mytilus hifurcatus Conrad, said to be from the Sandwich Islands, 

 is a common Cahfornian species. See Nautilus XII, Oct., 1898, p. 

 69. 



Cardium thaanumi n. sp. PI. XII, flg. 24. 



The shell is small, plump, thin. Beaks full, sUght^ inclined 

 forward, nearly smooth; posterior end truncate, anterior rounded. 

 White with the beaks and numerous rays of a light coral red color; 

 the rays faint except towards the periphery. 



Sculpture of many very fine, even radial striae, which are closely, 

 minutely prickly towards the periphery and ends. Hinge-teeth 

 well developed; inner margin crenulated. 



Length 11, height 10.5, diameter 9 mm. 



Off Waikiki, Oahu, 35 to 50 fathoms. Also off Launiupoko 

 Camp, near Lahaina, West Maui 4 to 8 fathoms, Thaanum and 

 Langford. 



