400 DE. J. a. DE MAN ON CEUSTACEA CHIEELT 



Aecania globata, Stimpson. (PL 31. figs. 11-13.) 



Arcania glohata, Stimpson, in Proc. Acad. Nat. Sciences Philadelphia, 1858, p. 160. 



Arcania globata, INIiers, in Proc. Zool. Soc. 1879, p. 44. 



Arcania globata, Ortmann, in Zool. Jahrb., Syst. vi. 1892, p. 577. 



One young male, collected at a depth of 8 fathoms in the Inland Sea of Japan; 

 bottom sandy. It is said to be here very rare. 



Measured in the middle line, this specimen appears to be 8 mm. long, Avhereas the 

 carapace is 7 '25 mm. broad without the spines, and 9 mm. when they are included. 

 Without the front the cephalothorax appears semiglobular, for the outline is circular 

 and it is strongly convex transversely and also much longitudinally. The front, which 

 is characteristic, is prominent, extending a little beyond tlie eye-peduncles. Its upper 

 surface, which is a little convex longitudinally, is slightly furrowed in the median line, 

 makes a very obtuse angle with the upper surface of the carapace, and appears to be 

 situated at a much lower level than the latter, in a lateral view or when the carapace is 

 looked at from in front. The breadth of the front is nearly one-fourth that of the carapace 

 (the spines included) and it is a little broader than long ; the slightly arcuate, lateral 

 margins terminate each in a small subacute tooth, and the anterior border of the front 

 between these two teeth is nearly straight, very slightly concave. The upper surface is 

 rather thickly beset with slender, subacute spines ; these spines, which are smooth and 

 almost of equal length, appear to be very slightly curved forward in a lateral view of the 

 carapace. A few similar spines, though much smaller, stand at the base of the front. 

 The spines on the upper surface of the carapace are about 80 to 90 in number. 

 Under a strong magnifying-glass the upper surface appears to be covered between the 

 spines with small pointed spinules, especially anteriorly. A much stouter though barely 

 longer spine stands on the middle of the well-defined intestinal region ; this spine is 

 granular and also slightly curved forward. Round the margin of the carapace are ten 

 conical larger and actde spines that are all granulated and more or less curved upward ; 

 they are as stout as the already described stouter spine on the intestinal region. Of the 

 five spines on each side, the third or middle one is placed just in the middle of the lateral 

 margin and somewhat curved forw^ard ; the fourth spine has the same size as the third, 

 and it is as far distant from the third as from the spine on the intestinal region. A fifth 

 spine, a little shorter than the third and the fourth, is placed on the outer angle of the 

 narrow posterior border of the carapace ; this spine, which is directed backward and slightly 

 outward, is also as far distant from the fourth spine as the fourth from the third. The 

 second spine, which is a little smaller than the third, stands somewhat nearer to the latter 

 than to the first ; the distance between the first spine and the second is just two-thirds 

 of that between the third and the fourth. The first to fourth spines and also the spine 

 on the intestinal region are all placed at some, nearly equal, distance from the lower 

 border of the carapace, i. e. from the base of the legs, but the fifth spine stands just near 

 the base of the last leg. One observes, moreover, two smaller spinules on the posterior 

 margin between the two spines of the fifth pair. 



Eye-peduncles a little shorter than the front ; the cornea, which is shining and dark 



