THE TRAKSACTIOj!fS OF THE LTNXEAN SOCIETY. 197 



densed account of the various hair-like organs which clothe the 

 body of this animal, all of which are here described in connection 

 with the several regions and appendages to which they were found 

 attached. Not only do they occur on most parts of the exterior, 

 but even the stomach of this crab is seen to be supplied with a rich 

 diversity of similar structures. They are not, however, continuous 

 with those of the integument, since none could be found along the 

 course of the intestine or oesophagus. 



Mr. Lubbock's ' Notes on some new or little-known species of 

 Fresh- water Entomostraca' refer to seven species of Oy clops, two of 

 Diaptomus and one of Lepidurus, "We select the last by way 

 of sample. Lepiduriis productus is a near ally of Apus, type of 

 the Branchiopoda 'phyllopoda — which, excepting the Trilohita, are 

 the only Crusta<?ea possessing more than the typical number of 

 somites. This simple fact, in no wise subversive of the doctrine of 

 common plan, has proved a stumbling-block to so distinguished a 

 carcinologist as Prof. Dana, who, with perverse ingenuity, has de- 

 vised what we must term an uncalled-for explanation of it. • Mr. 

 Lubbock courteously points out the futility of such "sdews, in a note 

 on the homologies of the Branchiopod group ; the irrelative repeti- 

 tion of whose somites is paralleled among air-breathing Arthropoda 

 by the Myriapods, which exhibit a similar divergence. Apus is also 

 remarkable for the scarcity of its males, first described in 1857, 

 more than a century after the discovery of the genus, by Kozu- 

 bowski, who counted only 16 among 160 females. Mr. Lubbock, 

 in stagnant pools near Eouen, found the males of LepiduruSt 

 hitherto undetermined, very abundantly, though the females ap- 

 peared to preponderate. The males, unlike those of Apus, were as 

 large as, or larger than the females, but Mr. Lubbock lays no stress 

 on this circumstance, since the species which he obtained were pro- 

 bably not adult and, therefore, did not rightly display the true 

 proportions, as to size, of the two sexes. 



But if the males of Apus be zoological wonders, how much more 

 marvellous is an Ilymenopterous insect " actually swimming by 

 "means of its wings?" Mr. Lubbock has been the first to witness 

 Ihis strange sight ; nor has he, like the too susceptible Eedi, making 

 wndue application of the maxim of his great compatriot : 



Sempre a quel ver ch'ba faccia di menzogna 

 De' I'uom chiuder le labbre finch' ei iiuote, 

 Pero che senza colpa fa vergogna ; 



