INACHIDvE 33 



Measurements of largest male in collection (the specimen figured) : 



Total length of carapace 115 mm. 



Total width of carapace 84 " 



Length of cheliped (approximately) 233 " 



Length of first ambulatory leg (approximately) 161 " 



This species is found from between tides to a depth of 50 ft. It is 

 commonly known as the "moss crab" from the fact that it is generally 

 completely covered with algae, hydroids, bryozoa, ascidians, and the like 

 so as to be "scarcely recognizable as a crab at all." It is, as might be ex- 

 pected, very sluggish in all its movements. 



Genus CHORILIA Dana. 



Chorilia Dana, Am. Journ. Sci., (2), xi, 269, 1851; Crust. U. S. Expl. Expd., part i, 

 91, 1852 (Type Chorilia longipes Dana). 



Chorilia longipes Dana. 

 Plate VI, fig. 16. 



Chorilia longipes Dana, Am. Journ. Sci., (2), xi, 269, 1851. 



Hyastenus (Chorilia) longipes Holmes, Occas. Papers Calif. Acad. Sci., vii, 33, 1900. 



Chorilia longipes Rathbun, H. A. E., x, 174, 1904. 



No specimens of this species from a point nearer than San Diego are 

 in the collection, although it is in all probabliity found in the bay. 



Genus SCYRA Dana. 



Scyra Dana, Amer. Journ. Sci. and Arts, ser. 2, xi, 269, 1851 ; Crust. U. S. Expl. 

 Expd., xiii (i), 80, 1852 (Type Scyra acutifrons Dana). 



Scyra acutifrons Dana. 

 Plate VI, fig. 17. 



Scyra acutifrons Dana, Am. Journ. Sci., (2), xi, 269, 1861. Rathbun, Proc. U. S. 

 Nat. Mus., xvi, 88, 1893. Holmes, Occas. Papers Calif. Acad. Sci., vii, 41, 

 1900. Rathbun, H. A. E., x, 175, 1904. 



This species (a series of about 30) shows, as stated by Holmes and 

 Rathbun, great variation in the tuberculation of the carapace and in the 

 form of the rostrum, as the following comparison of two large males of 

 approximately the same size will show. 



