RrFFANO TILL K. SV. VET.-AKAT). ItANDL. BAND 26. AFI). IV. N:0 12. 4il 



that deseribed by 8ars (fig. 10 a). By this, I think, the ideii- 

 tity of botli forms will be proved conclusively. It is, if I 

 niay say so, a connecting link between botb. In all important 

 poiiits it closely resenibles 1). spinnlosa, except in the less 

 number of the spines on the surface of the carapace. Tnstead 

 of eight spines, formin g- on either side a somewhat arched 

 series, there is on the left side onlj^ four, resp. no. 4, 6, 7, 8, 

 and on the right three, resp. (!, 7, S. Of those situated in- 

 side this series and on that part of the carapace which is 

 slielving down toward the so-called rostrum, none is deve- 

 loped, their place being here occupied by tubercles obtnsely 

 rounded like those in Z). nodosa. In fact, these are nothing 

 else than the base upon which the spines are fixed. Attached 

 to the upper plain margin of the basal piece there is, in most 

 cases, a fine single hair of the same length as the spine it- 

 self (fig. 10 c). 



Hansen (1. c.) found a young male which had the pro- 

 jections of the carapace in the same number, and ärran ged 

 in the same way as in the fullgrown females, but all were 

 rounded, not pointed. He believes that D. nodosa is a 

 variety of the typical form differing from that in having 

 the spines reduced in number and, besides that, all being 

 truncated. According to him, the females should have spines, 

 and the males tubercles, on the carapace. As shown above 

 I do not think that this is the case, because I found two 

 young males of tlie length of 16 — 17 mm., thus nearly as great 

 as that deseribed above, with the typical number of pointed 

 spines. Thus there is a fine series of young males which ex- 

 hibit a gradual transition to D. nodosa, viz. 1) the males 

 [length 16 — 17 mm.] of the same appearance as the female in 

 regard to the spines, 2) the male [length 18 mm.] both 

 with spines and tubercles, 3) Hansen's speciraen with tu- 

 bercles in the same number as spines in females. 4) Särs' D. 

 nodosa with a reduced number of tubercles. 



In regard to the number and arrangenient of the spines 

 on the free segments and on the abdomen, my specimens 

 differ but little from the type-specimen as deseribed hy 

 Heller. ^ 



' Tn the parts V & VI of Särs' Cumacea recently publislied, I find now 

 that Särs himself doos not seem to he fally oonvinced of the specific value 

 of his D. nodosa (\. c. p. aG). 



