MAZATLAN UNIVALVES 209 
=A. secutum D’ Orb. loc. cit. pl. 64, f. 8—10, excl. diagn. (teste 
Mid.) 
?=Lottia punctata, Gray ; (non Quoy & Gaim.) teste Mid. 
=P. Oregona, Nutt. in Jay’s Cat. no. 2852 :—Rve. Conch. Ic. 
pl. 36, f. 112, a, b. 
+P. umbonata, Wutt. loc. cit. no. 2887 :—Rve. loe. cit. pl. 35, 
f. 107, ab. 
+P. pileata, Nutt. loc. cit. no. 2861. 
This species is known by its comparatively small size, com- 
pressed sides, and recurved apex. The front part is sometimes 
covered with stout, rounded ribs, sometimes with a very few 
fine and separate ones, and sometimes nearly smooth. It is 
either uniform in tint, or is minutely spotted outside; inside 
white and blackish brown. The solitary Mazatlan specimen 
has broad, rounded ribs, and a somewhat shagreened surface ; 
and measures Jong. ‘96, lat. °8, alt. °42. 
Hab.—Sitcha, Eschscholtz—Mouth of Columbia River, WVut- 
tall.—Sta Barbara, Col. Jewett—San Diego, Lieut. Green.— 
Mazatlan; 1 fresh sp.:; L’pool Col. 
Tablet 1008 contains the specimen. 
267. AcM=EA scaBRa, JVutt. 
Jay's Cat. no. 2907.—Rve. Conch. Ic. sp. 119, pl. 37, f. 119, a, 6. 2 ® 54 
Non Patella (Lottia) scabra Gould Exp. Shells, p. 10:—/*%; 
= Patella spectrum, Nutt. in Jay’s Cat. no. 2877 :—Rve. loc. 
cit. pl. 29, f. 76, a, b. 
Although the name of Gould was published with description 
_before that of Nuttall, yet I have presumed upon the known 
courtesy of Dr. Gould, in order to avoid re-naming a species 
which has been widely distributed in collections, and which 
(as well as Dr. Gould’s A. scabra, under the name of P. spec- 
trum) has been figured in the Conch. Ic. This shell occurred un- 
named in Dr. Gould’s collections. It frequents the temperate 
portion of the coast, and is easily recognized by its light flesh 
colour, and tubercular rasp-like surface. Long. 1'06, lat. *9, 
alt. °4. 
Hab.—California, Nuttall Monterey and Sta Barbara, Col. 
Jewett.—Mazatlan ; 1 sp. only ; L’pool Col.—S. W. Mexico ; 
I spi: Pi. 6. 
Tablet 1009 contains the specimen. 
