1889.] NATURAL SCIENCES OF PHILADELPHIA. 175 



Archaster typicus, M. and T. 1 California, 4 Lower California 

 and 1 Mulege Bay, Low. Cal. (Fisher coll.), W. N. Locking- 

 ton ; 1 Sandwich Islands, W. H. Pease. 

 The specimen from the Sandwich Islands differs from the others 

 by its narrower arms and greater number of arm plates, having 

 about 40 on each side of an arm, whereas the others have only about 

 35. It differs also in color, being of a very light cream color instead 

 of light or dark umber. This however may be due to the fading of - 

 the original tint. This species has not before been recorded either 

 from the Pacific Coast of North America or from the Sandwich 

 Islands. 



PTERASTERID.ffi. 



Pteraster tessellatus, Ives. A single type specimen in alcohol. 

 Proc. Acad, 1888, p. 421. Kodiak, Alaska. Dr. W. H. 

 Jones. 



OPHIUROIDEA. 



OPHIURIDJE. 



Ophiura appressa, Say. 1 Callao, Peru, Dr. W. S. W. Ruschen- 

 berger ; 3 Florida ; 14 (alcoholic) locality undetermined. 



Ophiura brevispina, Say. 1 Rhode Island, A. D. Bache. 



Ophiura cinerea, M. and T. 5 Aspinwall, W. M. Gabb ; 16 

 (alcoholic,) locality undetermined. 



Ophiura panamensis, Liitk. 1 California, W. M. Gabb ; 2 

 (alcoholic) Panama (?), KcXeil Expedition ; 1 San Bartolome 

 Bay, Low. Cal., W. N. Lockington ; 3 (alcoholic) San Diego, 

 Cal., Jos. Jeanes; 1 alcoholic, West Coast of Mexico, Dr. W. 

 H. Jones. 



Ophiura teres, Lyman. 1 Cape Tortola, Low. Cal., and 1 locality 

 undetermined, W. N. Lockington ; 1 alcoholic, Nicaragua, Dr. 

 Bransford ; 3 dried and 7 alcoholic, West Coast of Mexico, Dr. 

 W. H. Jones. 



Ophiolepis elegans, Liitken. 1 (alcoholic) Sarasota Bay, Fla. 

 (12 feet), Heilprin coll. 1886. 



Ophioplocus esmarki, Lyman. 3 (alcoholic) San Diego, Cal., Jos. 

 Jeanes ; 1 (alcoholic) West Coast of America, George David- 

 son ; 6 locality unknown, W. N. Lockington. 

 The number of arm spines to each side arm-plate in this species 



appears to be somewhat variable. In the specimen from the West 



