212 University of California Publications in Zoology  [Vou. 28 
Genus Loxorhynchus Stimpson 
Carapace spiny or tuberculated. Rostrum two spined, spines coalescent at base 
and then divergent. Basal antennal joint enlarged, subquadrate, and having a 
laterally projecting spine at the outer angle. Preocular and postocular spines 
prominent; postocular flattened and densely hairy on anterior face, so that cornea 
of retracted eye is partially concealed from above; orbits interrupted by a deep 
sinus above and below. 
KEY TO THE CALIFORNIA SPECIES OF LOXORHYNCHUS 
I. Hepatic region with two large spines; carapace with numerous nearly equal 
tubercles; sparingly hairy or smooth in adult. 
grandis, p. 212. 
II. Hepatic region with one large spine; carapace with from nine to twelve 
prominent tubercles; covered with a short, thick, felt-like coat of hair. 
crispatus, p. 213. 
Loxorhynchus grandis Stimpson 
Loxorhynchus grandis Stimpson, Proc. Boston Soe. Nat. Hist., 7, 85, 1857; 
Jour. Boston Soe. Nat. Hist., 6, 452, pl. 20, fig. 1, pl. 22, fig. 1, 1875; 
Holmes, Occas. Papers Calif. Acad. Sci., 7, 29, 1900; Rathbun, H. A. E., 
10, 175, 1904; Weymouth, Stanford Univ. Publ., Univ. Ser., no. 4, 31, 
pl. 5, fig. 14, 1910; Baker, Rep. Laguna Mar. Lab., 1, 102, 1912. 
/ 
TON 
a b 
Fig. 132. Loxorhynchus grandis, 9, X %; a, ventral; b, lateral view of rostral 
region (after Stimpson). 
Characters.—Carapace broadly ovate, with numerous nearly equal tubercles; 
sparingly hairy or smooth in the adult; hepatic region with two large spines. 
Rostrum much deflexed, curved almost in a direction at right angles with the 
horizontal axis of the body. Preocular spine large, often more or less double 
pointed. 
Dimensions.—Type, female: length of carapace 141 mm., width 115.3 mm. 
A large specimen taken at San Diego measured 186.4 mm. in length and 148.6 mm. 
in width (Stimpson). 
Color.—Color of exposed parts is reddish, inclining to roseate, becoming yel- 
lowish, white on the sides. Fingers white (Stimpson). 
Type Locality—Coast of California, near San Francisco. 
Distribution.—From Point Reyes and the Farallon Islands to San Diego, Cali- 
fornia; 6% to 68 fathoms. 
