\i- 



I \(;i; sKfiiisiMono 



8t«go. these lougths vary si.inewhat. The seventh 1 i m 1) is of the definitive typo witli 

 two distal bristUvs, one long and one sliort one. The number of bristles on tlie other limbs 

 is ..nlv verv sliglitlv (b<civased. The penis consists of two very small embryonal processes. 



Each f ureal lamella has six claws. 

 '~¥g?J^g?s?^tJ3i9^¥a;'^'gi^g^^Si?|!iJ^5jsg]^:?Ar|^-;^^^ vvhich decrease faiil\- regularly in length 



and strength the more |)roximally they 

 are situated. 



Female: Shell: Average length, 

 1,(»U mm. It is oi the same type as in 

 the male of this stage; the secondary teeth 

 on tlic |)oster()-dorsal spine are, however, 

 somewhat less developed. The r o d- 

 shaped organ is similar to that of 

 the male in this stage. The limbs are 

 about the same as in the female of the 

 preceding stage. The f u r c a is similar 

 to that of the male in this stage. 



There cannot be the slightest doubt 

 that these two larval stages really belong 

 to C. elegans, as in the region from whicli 

 these specimens were obtained there are, 

 except the species mentioned, only two 

 forms of tile genus Conchoecia, namely 

 C. ohtusata (t. 0. Sars and C. borealis 

 G. 0. Sars; there is no risk of confusion 

 with either of these species during the 

 two oldest larval stages. 



It seems also to be quite certain 

 that they represent two moults. The 

 agreement with the observations of 

 ('. Claus and G. W. MCixer is com- 

 plete; cf. the latter author, 1894, 

 pp. 183, 184. 



Measure ni e n t s: — 

 258 specimens of this species from 

 the station mentioned were investigated 

 and measured. The measurements of the lengths of the shells gave the following result, as 

 shown graphically in fig. XXII. 



The above table shows that the specimenij could be divided into three distinct male 

 and three female classes according to the lengths of their shells. The male class 68 — 61 and th<' 

 female 53 — 60 represent mature specimens. 



Kisr. XXII. — • Curves sho\ving the results of my iiii-asui't;ni(;iits d 

 Ihelengtlisof the shells of a number of specimens of Conchoecui 

 elfgans from Koster, west coast of S^xeden. — = the females; 



= the males. The abscissa represents the lengths of 



the shells expressed in divisions of a micrometer (27 divisions 

 = 1 mm.); the ordinate represents the niiriiber of sin'iinieiis 



measured. 



