Mindeskrift for J. Steenstrup. XXVI. 



Senna's figure (1. c. PI. 11 fig. 8) shows a lobate appendage, but gives no details; 

 in the text he writes only (p. 295), "Nei maschi di 15 mm (in the explanation of 



the piates is by a misprint written Mastigopus ?), 

 il petasma e una breve lamina lobata (fig. 8)". 



In both my specimens it is very easy to see, 



that already in the Mastigopus-stage the petasma 



consists of the same elements as in the adult. 



It is articulated to a little process in the pleopode. 



On the edge towards the pleopode it bears a small 



appendage, which becomes much larger in the 



adult; a little more distally, but turned towards 



the middle-line of the animal, another appendage 



is fixed, joined to the corresponding one in the 



petasma of the other side of the animal. Apic- 



ally the petasma bears 4 buds. Distinct articula- 



Fig- 1- F'g- 2. tions I have not been able to see; but it is pos- 



sible that the narrow stalk in the specimen from st. 206 (fig. 1) is articulated to 



the rest. 



2. Petasma of the adult (fig. 3—6). 

 Fig. 3 shows the petasma of a young d*, 16 mm, from st. 160 (35° 59' N, 28° 14' E), 



Fig. 3. Fig. 4. Fig. 5. Fig. 6. 



1000 m wire out; fig. 4: 31 mm, st. 66 (36° 16' N, 6° 52' W), 1200 m wire out; figs. 

 5 — 6: respectively 35 and 26 mm, both from st, 66 (see above), 600 m wire out. 



