Why the Females stay at Home. 189 



his statements, which at first seemed to me very 

 problematical." 



With the details themselves we need not trouble 

 the reader. Those who would take up the study of 

 these small but remarkable animals, in which the 

 breathing apparatus appears to be quite unique, 

 should by all means consult the works of Professor 

 G. O. Sars of Christiania, who, like so many other 

 zoologists, several times makes reference to valuable 

 specimens sent him from Millport. In 1879, for 

 example, when re-describing the above-mentioned 

 Nannasta<eus unguiculatus among the cumacea of the 

 Mediterranean, as all the examples he had obtained 

 from that sea were females, " The figures of the male 

 here given," he says, " are from British specimens sent 

 me by Mr. Robertson." 



As the females in this group never have swimming 

 feet, with which the males are generally provided, a 

 difference of behaviour between the two sexes results, 

 which Mr. Robertson was probably the first to 

 observe, namely, that the females remain decorously 

 at home in the sand at night time, at which period 

 the males disport themselves in a lively manner at 

 the surface, where they can in consequence easily be 

 taken with a hand-net 



How highly Dr. Dohrn thought of the opportunities 

 which had been presented him by his friend at 

 Cumbrae is shown also in the paper which he read 

 before the British Association in September, 1867. 

 After stating that his investigations had been carried 

 out some weeks previously at Millport, on the Clyde, 

 he further says : 



