6o 



the antennal scales; it is t-dentate, but here also the 3 posterior teeth are placed behind the 

 I*' tooth of the lower margin. Different from the adult male the teeth on the lower margin 

 are not paired with those of the upper, but tliey alternate with them. 



The 3'^'^ abdominal somite (Fig. 12 c) has a different form, because the dorsal carina is 

 much more strongly curved; the spine on this somite is the largest of the four and that 

 of the 4''' is distinctly smaller than those of the 5"^ and 6''* which are of equal size. Sixth 

 somite (4,75 mm.) almost twice as long as 5''' (2,5 mm.), telson just as long as 6'*' somite and 

 slightly shorter than the outer uropod ; 4 or 5 pairs of lateral spines besides those at the tip. 



The two younger specimens from this Station are 20 mm. long and belong to the parva 

 stage. In one of them the rostrum extends just beyond the far end of 2"'* antennular article 

 and has the same form as in the specimen from Stat. 203. It is f-dentate; the 8 teeth of the 

 upper margin that all stand on the rostrum itself, regularly decrease in size from the 1*' which 

 is placed just in front of the orbital margin, to the last and the distal tooth is just half as far 

 distant from the tip as from the first; the 5 much smaller teeth on the lower margin are paired 

 with the 5 distal teeth of the upper. The rostrum of the other specimen shows the same 

 characters and is also l^-dentate, but the i^' tooth stands above the orbital margin and the 

 8"' is 3-times as far distant from the i*'' as from the tip. Second abdominal tergum slightly 

 carinate, 3'''' presenting the same form as in the specimens from Stat. 203. The measurements 

 in millimeters of the s"* and 6''' somite and telson are the following: 



Length of the s'li somite 



Length of the 6ih somite 



Width of the 6'li .somite anteriorly . . 

 Length of telson 



In the first specimen the 6'*^ somite is 2,4-times as long as the 5''' and 2,8-times as long 

 as wide, in the other these numbers are 2 and 2,8: the telson is armed on each side with 4 

 spinules in both specimens, besides those at the tip. The 6''' somite has a somewhat stouter 

 form than in the specimens from -Stat. 203 and the second forms a transition to the parva 

 tnuliidetis stage, the 6''' somite being only twice as long as the 5''*. 



The specimen from Stat. 243, finally, measures 22 or 23 mm. and belongs also to the 

 parva paucidctis stage. The rostrum, which is as long as the antennular peduncle, is t-dentate; 

 the i^' tooth of the upper border .stands just in front of the orbital margin and its distance 

 from the 7"' is somewhat more than twice as long as the distance between the y'** and the ti]); 

 the 4 much smaller teeth of the lower border are situated on the middle of the rostrum and 

 alternate with the 4 distal teeth of the upper. 



Second abdominal somite carinate, the 3''* presenting the same form as in the specimens 

 from Stat. 203. Fifth somite 1,7 mm. long, 6''' 3,95 mm. long, 2,32-times as long as 5''^ and 

 2,86-times as long as wide anteriorly, being here 1,38 mm. broad. The lateral margins of the 

 telson which is 3,6 mm. long and which by the terminal spines of the tip reaches as far 

 backward as the outer uropod, are armed with 4 spinules before the tip. 



General distribution: Aca7ithcphyra pnrpurea seems to have an almost cosmo- 



