132 . BULLETIN OF THE BUREAU OF FISHERIES. 



large collection of specimens taken by Mr. Edwards with the tow net, or gathered by the 

 Survey parties during the shore collecting, has been identified for us by Dr. B. W. 

 Kunkel. A few of the readily recognizable forms (e. g., Unciola irrorata) were frequently 

 listed in the field. Unfortunately during the first season all the Caprellidae were recorded 

 by the collectors as "Caprella geometrica." Since some other members of this genus 

 have been recorded from the region, and particularly since the allied ALginella longicornis 

 is found with great frequency, such records are, of course, equivocal, and they have been 

 changed to "Caprellidae sp." Later dredgings have, however, resulted in differentiating 

 to some degree the distributions of these species, but not sufficiently to warrant 

 our plotting out a separate chart for each. We have consequently prepared a single 

 chart showing their combined distribution. 



On the average 1.6 species of amphipods are recorded for each of the Survey dredge 

 hauls. The species found to have the most general distribution was Unciola irrorata, 

 which was taken at 115 of the regular dredging stations. No other member was 

 encountered at as many as one-fourth the entire number of stations. 



The most salient fact respecting the distribution of the bottom-dwelling amphipods 

 in local waters is the paucity of species in Buzzards Bay as compared with Vineyard 

 Sound. In fact, of the 19 species for which distribution charts have been plotted, only 

 2 are shown to be of greater abundance in the Bay, while not more than 2 others seem 

 to be present in about equal numbers in the two bodies of water. We may for con- 

 venience group the species as follows with reference to their comparative abundance 

 in one or the other body of water. 



Species wholly or chiefly restricted to Vineyard Sound. 



Sound Bay- 

 stations, stations. 



Lysianopsis alba 11 2 



Haustorius arenarius 11 1 



Byblis serrata 16 4 



Calliopius lseviusculus 15 o 



Pontogenia inermis 25 2 



Batea secunda : 24 1 



Gammarus annulatus 9 1 



Elasmopus lsevis 30 3 , 



? Autonoe smithi (data too few) 12 5 



Amphithoe, rubricata 32 9 



Jassa marmorata 16 1 



Ericthonius minax 31 1 



Corophium cylindricum 59 7 



iEginella longicornis) - 



Caprella geomtrica J 



Species chiefly restricted to Buzzards Bay. 



Ampelisca macrocephala 4 27 



Ptilocheirus pinguis 14 42 



Species of nearly unrestricted distribution. 



Ampelisca spinipes 32 23 



Unciola irrorata 70 40 



