146 



of the rostrum 



teeth. In the largest specimen, a female with eggs, tlie rostrum 



5 + 1 

 that is dentate, is very slightly (0,5 mm.) shorter than 



the scaphocerites, quite horizontal, not turned upwards at tlie tip. 



The shorter ramus of the outer fiagellum extends by tAvo-thirds 

 or three-quarters its length, the fused portion included, beyond 

 the rostrum, sometimes almost by its whole lengtli, in 2 speci- 

 mens, liowever, only by three-fifths of it. 



The smallest specimen with eggs is 47 mm. long. 



The mediterranean forni, like probably also that which is found 

 in the Adriatic, should therefore be referred, in my opinion, to 

 the variety Fdhrirli Ratiike. 



FaldriHOH Leackii Bell certainly also belongs to the variety 

 Fahricü Rathke. 



Upon my request Prof. M. Braun of König'sberg has been so 

 kind to send me two type specimens of Palaemoti reet irosf ris 

 Zaddach from the Bay of Danzig, preserved in the Zoological 

 Museum of that University. The examination of these types 

 brought at once to light that P. rectirosfris Zaddach is idcnfiad 

 with the variety Fabridi of L. adspeysns (Rathke). 



ünfortunately both specimens are much mutilated, in both types, 

 indeed, the caudal fan and tlie 6^^ segment of the abdomen are 

 wanting, like also the legs of the 2^ pair: measured from the 

 apex of the rostrum to the end of the 5^h segment of the abdomen 

 they proved to be 52 mm. long. The rostrum of one of the two 

 specimens (Fig. 2;;^), a little, viz. 1,5 mm., longer than the scales, 

 extends straightly forwards, hardly trending upwards at apex; 



the rostral formula is — ^-, the 2-1 tooth arises iust behind 

 4 



the orbital margin, but the apex of this tooth is distinctly 

 situated before it, as is generally the case in L. adspersus. 

 The distance between the 2<i and the 3<1 tooth is as large as 

 that between the 'M and the 4Hi; this distance is shorter than 



