1921] Schmitt: The Marine Decapod Crustacea of California 111 
Axiopsis spinulicauda (Rathbun) 
Axius spinulicauda Rathbun, Proc. U. 8. Nat. Mus., 24, 886, 1902; H. A. E. 
10, 149, fig. 90, 1904. 
Fig. 74. Axiopsis spinulicauda, 2, X 2; a, dorsal view of anterior portion; b, 
tail-fan (from Rathbun, U. S. N. M.). 
Characters.—Rostrum reaches the middle of the second joint of antennular 
peduncle, slightly deflexed, longitudinally channeled; armed on either side with 
five to six teeth. Gastric region of carapace traversed by five carinae, all of 
which fade out before reaching the cervical groove; the median one extends along 
the basal third of the rostrum, and is armed with four spines just behind the line 
of the orbits; outer carinae are a continuation of the side margins of the rostrum; 
outer and intermediate carinae unarmed; in front of the narrow median posterior 
lobe of the carapace, the surface is compressed or pinched to form a short smooth 
ridge. Eyes black, of same diameter as the stalk, not reaching middle of basal 
antennular segment. Outer maxillipeds reach the end of the antennal peduncle. 
Abdomen smooth above; pleura sculptured and pubescent. 
Dimensions.—Type, female: length of carapace and rostrum along the median 
line 19.6 mm., length of rostrum 3.5 mm., of abdomen 31.5 mm. 
Type Locality—Off Bodega Head, California, 62 fathoms (‘‘ Albatross’’ 
station 3172). 
Remarks.—This species apparently belongs to the genus Awxiopsis Borradaile 
(1903, p. 588). The exopodite of the uropods shows a suture and the eyes are well 
pigmented, but as there is a suggestion of a keel at the posterior end of the median 
line of the carapace that portion of Borradaile’s definition regarding ‘‘no keel 
on the carapace behind the cervical groove’’ must needs be modified to include 
this species. Except for the well pigmented eyes it fits almost as well under 
Calastacus below, as does C. quinqueseriatus Rathbun. 
