1921 ] Schmitt: The Marine Decapod Crustacea of California 193 



A. Bostrum simple. 



1. Postocular spine small and distant from the eye or absent. 



a. Chelipeds fairly short and stout, dactyl about one-half total length 



of hand, no supraocular spine. Carapace not spiny, elongate, 

 pyriform, narrowed in front; hepatic region tumid, with two 

 not very prominent tubercles, the larger above and in front 

 of the smaller. (Not known north of Monterey Bay.) 



Podochela, p. 195. 



b. Chelipeds long and slender, dactyl about one-fourth total length 



of hand; a prominent supraocular spine. Carapace spiny. 

 (Not known north of Monterey.) 



Anasimus, <$, p. 196. 



2. Postocular spine prominent and close to eye. Chelipeds moderately 



short and stout, dactyl about one-half total length of hand. 



a. A prominent acute, supraocular spine. Carapace spiny. A low 



tubercle or spine on first abdominal joint. (Not known north 

 of Monterey.) 



Anasimus, J, p. 106. 



b. Upper margin of orbit prominent, but without supraocular spine. 



Carapace furnished with tubercles and granulations. A prom- 

 inent spine-like tubercle on first abdominal joint. (Not known 

 north of Monterey Bay.) 



Inachoides, p. 199. 



B. Bostrum bifid, composed of two long, slender, contiguous spines. Post- 



ocular spine prominent, slender, acute, inclined forward and situated 

 some distance behind orbit. Chelipeds rather slender, dactyl about 

 one-half total length of hand. (Not known south of Monterey Bay.) 



Oregonia, p. 198. 



II. Basal joint of antennae not extremely slender, often very wide. Length of 



basal antennal joint less than distance between lower orbital margins; 



usually in the proportion of two to three. Bostrum bifid except in 



Epialtus, where it may be either bifid or simple. 



A. Basal joint of antennae truncate-triangular. Eyes without true orbits, 



eye-stalks very short, either concealed beneath a supraocular spine, 



or sunk in the sides of a huge beak-like rostrum. Postocular spine, 



if present, with anterior face convex or flattened so that cornea of 



retracted eye is always visible from above. Exognath of outer 



maxillipeds widest in distal half, tapering abruptly. 



1. Antennae concealed beneath the rostrum. Lateral margins of carapace 



not markedly flattened or produced. Surface of carapace smooth 

 or undulated. Bostrum bifid or simple. 



Epialtus, p. 200. 



2. Antennae not concealed beneath the rostrum. Bostrum bifid. 



a. Lateral margins of carapace not markedly flattened or produced; 



with two large lobes or teeth on each side; upper surface with 

 spines or tubercles. 



Pugettia, p. 205. 



b. Lateral margins of carapace markedly flattened and produced, 



entire lateral portions of carapace wing-like; upper surface 

 smooth or nearly so. 



Mimulus, p. 204. 



