202 University of California Publications in Zoology [Vou 23 
downward and curved inward, inner margins dentate and contiguous throughout 
their length, except in old males, in which they may become more or less gaping at 
the base. 
Dimensions.—Type, female: length of carapace, inclusive of rostrum, about 
44.55 mm. Large male: length, tip of rostrum to back of carapace 170 mm., width 
at first anterolateral tooth 84 mm., length of chelipeds 195 mm.; large female: 
length 92 mm., width 78 mm., length of chelipeds 90 mm. (Weymouth). Length 
of carapace for the Bay specimens ranged from 3 to 67 mm., mostly about 25 mm. 
Color.—In life color varies from dark brown to tan, the lighter shades being 
found in young and apparently recently moulted individuals, in which also the dark 
spots mentioned by Holmes are inconspicuous or absent. Under parts reddish, often 
bright brick red, sometimes with light markings on the coxae of the ambulatory 
legs and on the external maxillipeds (Weymouth). Color reddish brown to olive 
brown, mottled with small, round spots of a darker hue (Holmes). 
Type Locality.—California. 
Distribution.—F rom British Columbia to Lower California (Rathbun). 
Remarks.—There may be small, setose tubercles on the median region of young 
specimens, but they disappear with age, and there are two rows of curved setae 
on the upper side of the rostrum which persist for a longer time. Old specimens 
are almost devoid of hairs or setae of any kind (Holmes). 
The young of the ‘‘kelp crab’’ are very common in the tide pools, clinging 
to Fucus and other brown algae, but mature specimens are found only in the kelp 
beds (Baker). 
Biological Survey of San Francisco Bay—E pialtus productus was 
only found in or near large patches of kelp: four fairly large speci- 
mens were taken August 1, 1912, below the low tide mark, from the 
extensive beds east of Point Bonita; one very large, one medium sized, 
and nine very small specimens, all told, were obtained on various 
occasions from the more or less abundant growths of kelp along the 
Sausalito shore ; and one small specimen was dredged in 2 to 3 fathoms 
(D 5778), in the vicinity of the kelp patches off the rocky portions 
of the Presidio shore, east of Fort Point. 
Epialtus nuttallii Randall 
Epialtus nuttallii Randall, Jour. Acad. Nat. Sci. Phila., 8, 109, pl. 3, 1839; 
Holmes, Occas. Papers Calif. Acad. Sci., 7, 23, 1900; Rathbun, H. A. E., 
10, 173, 1904. 
Characters.—Carapace ovate, convex, smooth; first tooth of anterolateral mar- 
gin small, not prominent, sides of carapace convergent anteriorly between the two 
pairs of lateral teeth. Rostrum prominent, depressed, flattened above, and having 
a small triangular notch at the tip. No preocular spine, postocular small. 
Dimensions.—Type, male: length of carapace about 101.6 mm., inclusive of 
rostrum, greater width a little over 76.2 mm., female but half the size. 
Color.—Dark purplish color, besprinkled with testaceous spots, becoming large 
and somewhat ocellate behind, and still larger and brighter on the under side of 
the body (Randall). 
Type Locality.—California. 
Distribution —From Santa Barbara to Ballenas Bay, Lower California (Rath- 
bun). 
