174 W. C. ALLEE. 



The nomenclature follows Pratt wherever the species are 

 listed in his Manual. Other species have the name given them 

 in the catalog of the Biological Survey. No attempt has been 

 made to give synonyms since these can usually be found in the 

 Survey catalog. 



The arrangement of species within the major divisions is 

 alphabetical. While this does violence to all principles of 

 taxonomy, the taxonomic sense is not strongly developed at 

 present, and this method renders the material more easily 

 available to the average zoologist than would be the case if a 

 strictly taxonomic system were followed. 



The records given in the habitat list are necessarily abbreviated. 

 Thus, Hydractinia is recorded as taken from "sand" when the 

 whole record should read: "on shells inhabited by hermit crabs 

 taken on sandy bottom"; or other animals, as Sagartia lucice, 

 recorded from "mud" which does not mean that the anemone 

 was growing on the mud but that it was found attached to a bit 

 of board or rock surrounded by typical mud conditions. 



The classification headed "eel grass" includes records of 

 animals living free among the eel grass, as Pecten; attached to 

 eel grass, as Pennaria; crawling over it, as Ophioderma; on the 

 substratum at its base, as Microcione; or burrowing in the 

 substratum at its roots, as Cumingia. In addition the lumping 

 is still greater for one must remember that eel grass begins to 

 grow on fairly pure sand and extends back to the pure muck 

 of the flats. 



A number of animals are recorded under "rocks and rock- 

 weeds" which were taken only from the substratum under or 

 among the rocks. Whenever all the records are for an animal 

 so found, the entry has been appropriately labeled. 



Under "range" is listed the information at hand showing the 

 distribution of the animal along the Atlantic Coast. The abbre- 

 viations are: N., north ranging; S., south ranging; M., approxi- 

 mately mid-range; L., local; C, cosmopolitan. Whenever an 

 animal is known to extend twice as far north of Woods Hole as 

 south, it is listed as north ranging and vice versa. (Cf. Hoyle, 

 1889). Some relations between the local and geographical 

 distribution will be discussed in a later paper. 



