294 University of California Publications in Zoology (Vou. 14 
Sculpture like 7. mertensii. Color olivaceous, or dull earthy brown, indistinctly 
clouded more or less with light blue, especially upon the side areas. The 
lateral areas are raised, and bear irregular rows of rounded pustules, the young 
having four rows, the adults 6 to 8. A strong lens reveals a fine, subobsolete 
granulation of the nearly flat surface between the pustules. The central areas 
have a fine but distinct and even radial striation, over which run acute narrow 
raised threads parallel to the dorsal ridge; upon the ridge these threads are 
seen to be more or less diverging, especially upon ‘the second valve. The end 
valves are radially ridged, the ridges bearing elongated pustules, or showing 
scars where such pustules have been. Mucro low, flat. 
Interior bluish, the valves marked under their umbones with dark olive. 
Head valve having 11, central valves 1, tail valve 11 slits; teeth roughened but 
rather sharp; eaves wide, dark, minutely punctulate, but solid, not spongy. 
Girdle compactly covered with small imbricating, deeply striated scales.’’ 
This chiton was collected by Wood and Raymond within this region. 
Not among the “‘ Albatross’’ collections. 
Range.—Bolinas Bay to Santa Cruz, California (Pilsbry). 
Ischnochiton magdalenensis Hinds 
Ischnochiton magdalensis Hinds (1844a), p. 54, pl. 19, fig. 1; Pilsbry 
(1892-1893), p. 62; Blankinship and Keeler (1892), p. 151. 
Description.—This species has been redescribed by Pilsbry (1892) as follows: 
“‘Shell elongated, rather narrow, generally faintly mottled with delicate 
olive on a light greenish blue or pinkish ground. Interior bluish white or pink. 
Lateral areas and end valves having radiating riblets, central areas finely pitted. 
The lateral areas are distinctly raised, radiately delicately ribbed. Front 
slope of the anterior valve straight. Central areas haying a more or less 
developed system of branching reticulating wrinkles producing oblong or 
diamond-shaped pits. Umbo of posterior valve central, but little projecting. 
Interior: sutural plates well developed, the sinus deep, angular. Anterior valve, 
having 10-13, central valve 2-4, posterior valve 10-12 slits.”’ 
This species was reported from the Farallon Islands by Blankin- 
ship and Keeler. 
Range—Farallon Islands (Blankinship and Keeler); Monterey 
to Magdalena Bay (Pilsbry). 
Nuttallina Carpenter 
Nuttallina scabra Reeve 
Nuttallina scabra Reeve (1847), pl. 17, fig. 106; Wood and Raymond (1891), 
p- 58; Keep (1904), p. 276; Pilsbry (1892-1893), p. 280. 
Description—This chiton was described by Pilsbry in the following terms: 
‘¢Shell similar to N. californica, but having the individual valves very much 
shorter in proportion to their width; the outer layer of the median valves 
produced at the sides anteriorly, curving broadly forward and laterally upon 
the sutural plates; the median ridge and sulci more or less obsolete. Tail valve 
shorter, with less posterior mucro. Color of valves lighter, more variegated. 
