149 



Height of 6tli somite anteriorly. 



Minimum thickness of 6th somite 



Length of carpus of y^ leg . 



, propodus , „ „ . 



V V dactylus , „ , . 



„ „ carpus of 4111 leg . 



, , propodus , , , . 



I. V dactylus , , „ . 



„ , carpus of 5th leg . 



, „ propodus „ , „ . 



„ „ dactylus , „ „ . 



N" I — s Stat. -,06. 



II 



4,1 



1.7 

 '7 

 15.25 



1.7 

 18.75 

 22 



2,2 

 20,5 

 26,2 



2,6 



„ . N" I male, N" 2 — 5 ova-bearing females; N" 6 — 11 Stat. 312, 

 X° 6 — 8 males, X° 9 — 11 ova-bearing females, the entire length of N" 11 could not be given, 

 the rostrum wanting entirely. 



Parapajidalus tenuipes Borr., which occurs in the same locality as this species, is no 

 doubt identical. The description agrees almost literally with that of Parap. serratifrons and no 

 characters are mentioned by which both forms can be distinguished. When the fifrure of this 

 species (1. c. fig. 9) is compared with that of Parap. serratifrons, some differences are, however, 

 recognizable, which probably have led the author to consider Parap. tenuipes as a distinct 

 species, but in this case it is quite singular that they were not indicated in the description. In 

 the figure of Parap. tenuipes the propodus of the i^' pair of legs is longer in proportion to 

 the carpus than in Parap. serratifrons, in this species the carpus of the 3''^ pair appears as 

 long, fig. 8«, as the propodus, but in the figure 9 distinctly longer, in fig. 8<7 the carpus of the 

 4"^ pair appears a little shorter than the propodus, in fig. 9 a little longer than this joint and, 

 as regards the s'^^ pair, the propodus appears in fig. 8a a little longer, but in fig. 9 a little 

 shorter than the carpus. The rostral teeth of the upper margin appear pro.ximally farther distant 

 from one another in fig. g than in fig. 8<7, but 1 have already pointed out (p. 147) that in some 

 specimens of Parap. serratifrons the rostral teeth are slightly longer, their apices farther 

 distant from one another than is usually the case. As regards the differences in length of the 

 joints of the legs, I may remind of the fact that a similar variability in the measurements has 

 also been observed in Pies, martia (A. M.-Edw.) var. semilaevis Bate (p. 119), but it occurs 

 indeed also in Parap. serratifrons, as results from the Table of Measurements. The propodus 

 of the 3'^'^ pair of the ova-bearing female (N" 10), for instance, is much shorter in proportion 

 to the carpus than in the egg-laden female (X" 4), the propodus of the 4'** pair in the female 

 (N" 11) longer in proportion to the carpus than in the female (X" g), the dactylus of the 4'^ pair 

 in the male (X" 6) shorter in proportion to the propodus than in the male (X" 7), the propodus, 

 finally, of the 5''> pair in the female (X" 11) much longer in proportion to the carpus than in 

 the female (X" 3). Therefore both species arc considered as identical. 



Dr. J. J. Tesch, formerly of the Leyden Museum, has been so kind to e.xamine for me 

 the only still existing specimen from Japan, that was described by de Haan (Fauna Japonica, 

 Crust., p. 175) under the name of Pandalus prist is, and to compare it with an adult, ova- 



