11 



consists in his indicating new a localit}' for Choniosfomn on the other side of NovaZemhlia 

 oijposite to mine (the Kara Sea), and that an otherwise very deserving' author has committed 

 a most peculiar mistake. That is all; whether I ought to have mentioned the subject is a 

 matter of opinion; at the time I thought it might as well be left out. 



I shall pass over several other remarks which might call for censure, and take up 

 some hypotheses set forth rather hesitatingly by the authors, p. 352—53. After having 

 declared themselves at a loss to understand that a CJtonio/<towa with its ovisacs can cause 

 a swelling in the carapace of a Hippohjte entirely resembling that which is produc:ed by 

 Gyge Hippolytes, they write: »I1 nous parait beaucoui) plus vraisemblable d'admettre que le 

 Cop6pode a infests les Hippolytes d6ja parasites pai- les Gyye, et qu'il supplante les Epicarides 

 ou tout au moins proflte pour se loger de la deformation produite par ces derniers«. To 

 this conclusion they add a doubt wliich I think rather iiielevant, and say further: »N6au- 

 moins en rapprochant I'^thologie d'Aspidoecia de celle de CJwnwstoma , il nous semble 

 bien probable qu'il existe un rapport, soit de para.sitisme , soit de mutualisme, entre ces 

 parasites et les Epicarides des genres Aspidopliryans et Gyge". However, they go still 

 fmther. They have found a genus of Epicaridea, Podascon G. and B., on a species of the 

 genus Ampcliscu, and Salensky has found nnmeious examples of a Splta-roiiclla in all stages 

 ou an Ampliipod of an alioydlicr diffcrmt iiunily. Here we should think it would be lather 

 difficult to establish a connection between the Epicaridea (Fodascon) and the Choniostomatid3e 

 (SplHcrondla), which live »exactement dans les memes conditions «; nevertheless they continue: 

 »on pent se demander s'il n'a pas existe autrefois enti-e ces deux groupes de parasites des 

 rapports analogues a cenx que nous avous cherch6 a d6montrer entr-e les auties Choniosto- 

 matides (Aspidoecia et Choniontoma) et certains Epicarides«. With the ^\'ord auti-efois« 

 the authors resort to the past, but it will be impossible in a case like the present one to 

 gain any perfect or imperfect knowledge concerning the Ibinier state of things. We confess 

 that this invention would be ingenious if — as sometimes happens where an excellent thing 

 is carried to an extreme — it had not overstepped the limit and become ridiculous. 



My experience, which is based on very extensive lesearches, enables me to declare 

 that, as far as the present time is concerned, these hypotheses, Avhich the authors repeat 

 with additional remarks in two later paiiei-s, ai'e entirely destitute of foundation. 



Of infested Isopoda this work mentions four examples of three species with three siiecies 

 oi SphceroneUa ; of Cumacea with parasites in the marsupium twenty- four examples lielonging 

 to six species (the parasites belong to five species), and of these six species I have examined 

 several hundred specimens, in order to find those tliat were infested. Of two species of 

 Cumacea seventy -three instances were found with (two species of) Homoeoscelis under the 

 carapace; finally, one hundred and forty examples of Amphiitoda (lielonging to twenty- eight 

 species) were found and proved to be infested with twenty-eight species of SplueronelJa and 

 Stenotocherea. Of these twenty eight species of Amphipodal have examined several thousand 

 specimens. So the result is, that of tdl three orders tuyefher I hare seen (dwut tua hundred 



