202 University of California Publications in Zoology [ v ol. 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 

 44.5 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.- — -From 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. — Epialtus 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 Bandall, Jour. Acad. Nat. Sei. Phila., 8, 109, pi. 3, 1839; 

 Holmes, Oeeas. Papers Calif. Acad. Sei., 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). 



