200 



ZOOLOGY OF THE FAR BAST. 



The rostrum reaches ahnost to the tip of the antennal scale in adults (text-fig. 8) ; in 

 the young it is a trifle longer. The upper margin is straight or very slightly convex 

 and bears from 8 to ii teeth ' ; the hindmost is rather widely separated from the next 

 of the series and the posterior two or three are placed on the carapace behind the level 

 of the orbit. On the lower border there are 2 or 3 large teeth. 



The accessory ramus of the outer antennular flagellum is longer than the 

 peduncle. 



The second peraeopods (text-figs. 8a, b) are equal and in well developed males reach 

 beyond the end of the antennal scale by the chela and at least half the length of the 

 carpus ; in the largest individual, however, they are proportionately shorter, reaching 

 beyond the same point only by three quarters the length of the chela. Five specimens 

 yield the following measurements : — 







(ji 





Second peraeopod 



: LENGTH OF 







al 



N^ 











M 





•4-, 













C 



L* 



0-> 









en 







.^ „•, 



J3 (LI 



g 



m 





3, 1 









f „ "S 



3 







p^ 



■ 'A 



rt 





a '^ 



jH 



2 ! ft 



g 



t1 



(U 









0) a 



W, 



M cfl 





d 



t/} 



fH 



i-f 



^ 



7-0 



8-4 , 9'3 



(M 



Q 



c? 



75 



22'4 



42-0 



9-6 



.5-6 



c? 



63 



i8-i 



52-5 



8-4 9-5 10-9 



133 



8-6 



c? 



57 



i6-i 



50-5 



77 9'3 1 To-4 



13-4 



8-3 Î 



9 



49 



13-2 



38-5 



5-9 7'2 8-4 



9-2 



6-2 1 



9 



43 



11-2 



307 



5-5 5-5 1 7'i 



7-0 



4-4 i 



It will be noticed that the carpus is decidedly shorter than the propodus in all the 

 larger specimens. In those below 45 mm. in length the proportions are, however, differ- 

 ent, the carpus being almost as long, or even (as in the specimen measured) a shade 

 longer than the palm. 



In the male 63 mm. in length the carpus is 27 mm. in breadth at the distal end, 

 the segment thus being about four times as long as broad. In all the larger specimens 

 tlie segments bear minute asperities, specially noticeable on the inner and under 

 surfaces of the carpus and propodus where they tend to form longitudinal rows. The 

 fingers bear few hairs ; on their inner margins there is a fine ridge extending from the 

 base to the tip ; there is a single small tooth at the base of the fixed finger and two in 

 a similar position on the dactylus. 



The telson is produced to a sharp apical point which is, however, exceeded by the 

 innermost of the two pairs of terminal spinules. 



The specimens collected by Dr. Annandale were found not far from Shanghai, the 

 locality from which von Martens described the species. There is thus little doubt 

 that they represent the true P. asperulus. 



' The rostral formulae in ten specimens are, — 8/2, 9'2, 9/3, 9/3, 10/3, 10/3, 10/3, io'3, 11/3, ii/.î. 



