VIll-llKI'OliT ITON TIIH INYHKTHmiATH A\l\l 

 OK YINKYAIM) SOIM) AND Till', AD-IAIKN! 

 , THUS, WITH AN ACCOUNT OF TIIH PHYSICAL 

 CHARACTERS <>!' TIIH KHIifON. 



\\\ A. I-!. \ i.iaau,. 



A. IIAIJITS AND DISTRIBUTION OF Till: IN V 



ANIMALS. 



I. GENERAL KEMA.IIKS. 



The investigation of the invertebrate lite of these waters, undertaken 

 ut the request of the United States Commissioner of Fish and Fisher- 

 ies, was actively carried forward during the entire summer of 1871, 

 and the very extensive collections then made have been studied by Mr. 

 S. I. Smith, Mr. O. Harger, and myself, as thoroughly as possible dur- 

 ing the time that has been at our disposal. The work upon the collec- 

 tions is by no means complete, but is sufficiently advanced to serve the 

 immediate purposes of the Fish Commission. 



To Mr. Smith I aui indebted for the identification of all the Crustacea 

 referred to in this report and the accompanying lists, except the Iso- 

 pods, which have been determined mostly by Mr. Harger, to whom my 

 thanks are also due for several excellent drawings of those animals. 

 To Professor A. Hyatt I am indebted for the identification of some of the 

 Bryozoa, and for most of the figures of that class. 1 am also under 

 obligations to Dr. A. S. Packard, Dr. G. H. Horn, and Dr. H. A. 1 la- 

 gen, who have identified the insects inhabiting salt water. 



According to the plans adopted these explorations had in view sev- 

 eral distinct purposes, all more or less connected with the investigation 

 of the fisheries. The special subjects attended to by this section of the 

 Fish Commission party were chiefly the following: 



1st. The exploration of the shores and shallow water for the purpose 

 of making collections of all the marine animals and ulgiB living between 

 tides, on every different kind of shores including the numerous burrowing 

 worms and Crustacea, and to ascertain as much as possible concerninu- 

 their habits, relative abundance, stations, \;c. 



I'd. The extension of similar observations by means of the <ln 

 trawl, tangles, ;uid other instruments, into all depths down to the d 



ateiS \\hieh were accessible to us. and to make a systeit: 

 vey, as complete Me. of all the smaller bays and h ithin 



1 V 



