12 c. BOVALLIUS, NOTES OX PTERYGOCERA ARENARIA, SLABBER. 



the other are each of about the same length, the thickness 

 decreasing the nearer they are to the point. The diameter of 

 the last joint is about the fourth of that of the first. The first 

 and second joints carry, in the foremost börder on the upper 

 side, 2 — o feeling-bristles feebly bent at the point, and 1 — 2 

 shorter ones on the lower side. 



The third, fourth and fifth joints carry moreover on the 

 upper side two, sometimes three long smelling-glandules of an 

 equal breadth and whith short peduncles (Pl. IV, fig. 64). 



The following but the last have only one such glandule 

 each. The last joint carries 3 — 4 feeling bristles and two 

 straight spines. 



The secondary flagellum is articulated to the upper corner 

 of the peduncle's last joint a little behind the insertion of the 

 primary flagellum. It consists of five joints; the two first are 

 the longest; all of them carry in the foremost börder 3 — 4 

 feeling-bristles and 1 — 2 short glandule hairs, secreting gluti- 

 nous matter. 



Tlie inferior antennce are, as before said, about a third 

 longer than the superior ones. The are inserted just below 

 the upper prominence of the foremost margin of the cephalon. 

 They have as usual a five-jointed peduncle. The first joint is 

 the smallest, broader in the foremost end, totally smooth. The 

 second joint is more than twice as broad, the lower part is 

 formed into a broad winglike expansion, destitute of hairs or 

 bristles. I have not been able tho discover the organ of smel- 

 ling, delineated by Spence Bate, on the foremost börder of 

 this joint *). The third joint is considerably slenderer than 

 the preceding one ; it carries, near the lower börder, 3 — 4 short, 

 thick bristles with long cilia, resembling bristles of hea- 

 ring. The fourth joint is the biggest, it is almost as long as 

 the three preceding ones together. Downwards it dilates into 

 a strong, wingshaped expansion, which is almost as broad as 

 it is long. The posterior margin is rounded, the fore- 

 most concave, presenting the tolerably large opening of 

 auditory cavity. Beside this opening there is placed a great 

 and well developed auditory bristle (Pl. IV, fig. 55); a row 

 of ten similar ones follows the lower börder of the joint, 

 moreover there are 10 to 12 spread över its outer side near 



') Catalogiie of AmphipodoiTS Crustacea, pl. XVIII. fig. c. 



