147 



tlio distances between the otlier tcoth. Measured at their apices 

 the interspaces between the teeth, from the Ist to the extremity 

 of the rostrum, prove to be 2,46 mm., 1,94 mm., 1,86 mm., 

 2,64 mm., 2,9 mm., 2,2 mm. and 0,8 mm. long and these numbers 

 also show that the apical tooth, which is closely situated to the 

 tip, is a little less distant from the 6it tooth as the latter from 

 the 5th. 



In this specimen the coalesced portion of the shorter ramus of 

 the outer antennular flagelhim is 2 mm. long (Fig. 2>/), the free 

 portion 6,2 mm., so that one-fourtli appears to be coalesced. ïhe 

 free portion consists of 17 joints that are more or less longer 

 than broad, while the terminal joint is a little more than twice 

 as long as broad. Like in the Scandinavian specimens the shorter 

 ramus extends by four-fifths (in the other type by two-thirds) 

 its length, the fused portion ineluded, boyond the apex of rostrum. 



54-1 



The rostral formula of the otlier type is 



the 2d tooth 



is situated as in the first and the distances between the apices 

 of the teeth, are, from the l^t tooth to the apex of the rostrum, 

 2,34 mm., 1,75 mm., 2,8 mm., 2,85 mm., 2,5 mm. and 0,6 mm. long. 

 Like in the first type, one-fourth of the shorter ramus is fused 

 to the outer fiagellum. 



M e a s u r e m e n t s of the 1 e o- s in millimeters. 



11 



