CALIFORNIA STALK-EYED CRUSTACEA. 29* 



Genus Loxorhynchus St. 



Rostrum two-spined, the spines coalescent at the base and then diver- 

 gent. Preocular and postocular spines prominent. Orbits interrupted 

 by a deep sinus above and below. Basal antenual joint enlarged, sub- 

 quadrate, and having a laterally projecting spine at the outer angle. A 

 spine beneath the postorbital near the base of the first joint of the anten- 

 na. Epistome large and subtrapezoidal. Ischium of the maxillipeds pro- 

 duced forwards at the autero-internal angle; merus entire at the distal end. 

 Ambulatory legs subcylindrical, of moderate length, and decreasing in 

 length posteriorly. The carapace is spiny and the abdomen seven-jointed. 



Type. L. grandis ST. 



Loxorhynchus grandis St. 



Loxorhynchus grandis STIMPSON, Proc. Bost. Soc. Nat. Hist., Vol. VI, 1857, 

 p. 85; Journ. Bost. Soc. Nat. Hist., Vol. VI, 1857, p. 452, PI. XIX, 

 fig. 1, PI. XXII, fig. 1; Ann. N. Y., Nat. Hist., Vol. VII, 1859, p. 49. 

 RATHBUX M., Proc. U. S. Nat. Mus., Vol. XVII, 1894, p. 74. 



Carapace very broadly ovate, inflated and covered with small, conical 

 tubercles of nearly equal size. Rostrum a little longer than broad, much 

 deflexed, the horns convex above and below and separated for a little more 

 than half their length. Preorbital spine large, often more or less double 

 pointed; postorbital spine subconical, acute. Chelipeds in the male large, 

 tuberculated; hand oblong, palm inflated, the edges rounded. Ambulatory 

 legs subcylindrical, sparingly tuberculated, the antepenultimate joints 

 grooved above; a small tubercle near the end of the merus. Abdomen of 

 the male contracted behind the third segment, the three following segments 

 of nearly equal width (the fourth slightly wider at the base); fifth and 

 sixth segments nearly equal and longer than the third or fourth; last joint 

 subtriangular, but rounded at the tip. Abdomen of female broadly ellipti- 

 cal, all the joints free; the joints increase in length from the third to the 

 sixth; last joint broadly rounded, much broader than long*. Thoracic 

 sternum transversely grooved. Carapace covered with short hairs. 



Stimpson gives the following measurements of a 

 female: 



Length of carapace 5.55 in. 



Width of carapace 4.54 ' ' 



Length of first pair of legs 4.90 " 



Length of second pair of legs 6.45 " 



Length of last pair of legs 4.75 " 



Farallon Islands! near San Francisco! Santa Cata- 

 lina Island! San Pedro! San Diego! 



