82 ZOOLOGISCHE MEDEDEELINGEN — DEEL IL 



Stebbing; it indeed furnishes, as in nearly all other Amphipods, the 

 most characteristic feature of the species. The spines on the palm 

 margin are mostly of one size, but on close examination there are scat- 

 tered some smaller spinules among them, in such a way that smaller 

 and larger spines alternate at regular intervals. There is no defining 

 knob at the palm margin, to which the tip of the closed finger may fit, 

 as in Orchestia gammarellus. According to Stebbing, there is a little 

 gap left between the closed finger and the palm margin, and the tip of 

 the finger overlaps this margin, but I have not been able to find these 

 features pronounced in the way as figured by this author. 



It is useless to give a fresh description of the pereiopods, as this has 

 been done by Stebbing. I only figured the two last joints of these pereiopods, 

 in order to corroborate my finds with those of Stebbing who likewise 

 figured these parts in the case of the first to fourth pair. The propodite 

 of the first two pairs is narrow at the base and strongly bulging at each 

 group of spinules, according to Stebbing's figures; but I found these 

 propodite parallel-sided nearly throughout and the bulging of the fore 

 margin much less pronounced; the inner margin of the dactylus of the 

 second pair is in Stebbing's figure strongly bulging at the base and this 

 part is separated from the rest of the margin by a deep notch ; but in 

 my specimens this dactylus agrees better with Stebbing's description : 

 „very short, abruptly narrowed on the inner margin halfway towards 

 the nail" ; indeed this finger does not differ from the corresponding one 

 in Talitrus saltator. The finger of the third pair is much inflated, but 

 narrowed towards the base and of course also towards the very short, 

 acute nail; those of the fourth and fifth pair are long and slender, 

 especially in the case of the last pair. Here there is no trace of the flat 

 expansion of the mero- and carpopodite, so conspicuous in the male of 0. 

 gammarellus. All the legs are strongly spined, and the spines are mostly 

 placed in groups, most regularly so in the last pairs of legs ; these spines, 

 and also those of the gnathopods are blunt, with a thick subterminal 

 hair, projecting sometimes a little way beyond the tip of the spine. 

 Even the larger conical hooks along the palm margin of the second 

 gnathopod are always provided with a distinct subterminal hair. 



About the pleopods, the uropods and the telson I have nothing to 

 add to Stebbing's description. 



The length of an adult male is four-fifths of an inch according to 

 Stebbing; my largest specimen was about 17 mm long. 



It is remarkable, as I previously said, that this species was caught 

 on our shore, long before it was described by Stebbing in 1891. At 

 Herklots's time it obviously occurred in quantities, as 12 specimens were 



