FROM THE INLAND SEA OF JAPAN. 403 



The upper surface of the rostrum is somewhat hairy in the middle, sliort. seta3 being' 

 arranged in curved, parallel rows on each side and near the middle line ; a longer seta is 

 inserted at the base of the fourth lateral tooth, in the middle, another nearly in the middle 

 of t]\e rostrum on either side of the median line. 



The lateral borders of the carapace are armed witb nine teeth, or rather spines. The 

 first spine is, in the male from the Inland Sea, a little larger than the first lateral tootb of 

 the rostrum and directed obliquely outward ; it stands at the outer angle of the orbits. 

 The second spine, a little less turned outward, is placed somewhat nearer to the first than to 

 the cervical groove ; one observes, between the scjcond and this groove, the two following 

 spines, viz. the third, somewhat smaller than the second, placed on the upper surface quite 

 near the cervical groove and a little remote from the lateral margin, and the fourth, which 

 is as large as the second, just below the lateral margin. Behind the cervical groove 

 the lateral margin carries five other spines, which are equidistant and of equal size, as 

 long as the second, except the last which is somewhat shorter. From each of the two 

 spines, on the boundary between rostrum and gastric region, a ciliated ridge runs 

 laterally towards tbe base of the second spine of the lateral margin of the carapace ; 

 posterior to the two spines one observes seven ciliated ridges, all reaching the lateral 

 margins, except the second, which terminates at the cervical groove. Between tbe third 

 and the fourth runs a short transverse ridge immediately in front of tbe cervical groove ; 

 between the fourth and the fifth a ridge proceeds, parallel with them, from the lateral 

 border until at some distance from the middle line ; between the fifth and sixth two similar 

 shorter ridges run from the lateral border inward, of which the posterior, which terminates 

 at the ninth spine of the lateral margin, is almost twice as long as the other. Between tbe 

 sixth ridge and the seventh a similar stria proceeds from the lateral border ; this stria is a 

 little shorter than the posterior of tbe two between the fifth ridge and the sixth. A 

 ciliated stria runs from the fifth lateral spine inward along the cervical groove, another 

 shorter one from the sixth lateral spine. All these ridges are ciliated ; the cilia are long, 

 viz. 0"3-0'35 mm. The upper surface of the carapace, of the rostrum, and of the abdomen 

 is thickly and coarsely punctate ; the anterior borders of the segments of the abdomen 

 are ciiiate and carry, moreover, a few rather long setae, which occur also in very small 

 number on the lateral parts of the upper surface of the carapace. 



The antepenultimate joint of the antennal peduncle is bispinose, carrying a strong 

 spine above and a similar one on the lower border ; the penultimate joint is armed above 

 Avith a single, somewhat smaller spine. 



The external maxillipeds (PI. 31. fig. 14), partly described already by Dr. Ortmann, show 

 the following characters :- — Measured along its outer margin, the ischium appears a little 

 longer than tlie merus; in the male from the Inland Sea the ischium is 1-5 mm. long, 

 the merus, however, 1'2 mm. The outer margin of the ischium terminates distally in a 

 sharp tooth, which is slightly turned inward ; the inner margin ends in a conical, stouter 

 though shorter tooth. The two acuminate teeth on the inner margin of the merus are 

 larger than those of the outer border ; the anterior spine on the outer border is somewhat 

 curved inward and stands at the distal end, the other nearly in the middle of the border. 

 The outer margin of the carpus is armed, in the male from the Inland Sea, with three sharp 



SECOND SEMES. — ZOOLOGY, VOL. IX. 68 



