BIOLOGICAL SURVEY OF WOODS HOLE AND VICINITY. 95 



but always within a very limited area near the head of the Bay. Mr. G. M. Gray also 

 reports finding it at Bird Island, in the same vicinity. We know of no other records 

 of the occurrence of this species. 



The following is a list of the species recorded from the Survey dredgings. The 

 asterisk denotes those which were taken at 10 or more of the stations (exclusive of Crab 

 Ledge). 



Chalina arbuscula. 

 Chalina oculata. 

 Esperella modesta. 

 Desmacidon palmata. 

 Myxilla sp. undet. 

 *Microciona prolifera (chart 13). 



Ascortis fragilis. 

 ?*Grantia ciliata (chart 10). 

 *Cliona celata (chart 11). 



Polymastia robusta. 



Tethya gravida. 



Halichondria panicea. 



Halichondria caduca. 



A chart (12) has been prepared based upon the equivocal records for one or both 

 species of Chalina. 



Of the three determined species so common as to have been recorded from 10 or 

 more stations, one appears to be distinctly northern, another to be distinctly southern, 

 while the third appears to have a range of nearly equal extent in both directions. The 

 ranges, as given by Verrill (1873), are as follows: 



Grantia ciliata: Rhode Island to Greenland. 

 Cliona celata: South Carolina to Portland, Me. 

 Microciona prolifera: South Carolina to Cape Cod. 



Cliona, as already stated, has since been reported from the Gulf of St. Lawrence. 

 3. CCELENTERATA. 



Our list comprises 160 determined species belonging to this phylum, together with 12 

 others which are undetermined or doubtful. These are assignable to 54( + 3?) families 

 and 98(4-7?) genera. The representation of the various classes is as follows: Hydrozoa, 

 i32( + 8?); Scyphozoa, 5(4- 1?); Actinozoa, 14(4-3?); Ctenophora, 8. Among these, 

 28(4-1?) of the Hydrozoa and 4( + 2?) of the Actinozoa have been encountered 

 during the Survey dredgings. The Scyphozoa and Ctenophora, owing to their pelagic 

 mode of existence, do not figure in the dredging records, although the latter frequently 

 and the former occasionally were taken during the reeling in of the dredge or trawl. 

 Furthermore, a large majority, even of the fixed hydroids, comprised in our catalogue, 

 find their proper habitat in shallower waters, where they grow attached to plants or 

 woodwork, and are rare or absent upon the bottoms reached by the dredge. 



The identification of specimens concerning which any doubt was felt by the col- 

 lectors was made by Prof. C. W. Hargitt, of Syracuse University, and Prof. C. C. Nut- 

 ting, of the University of Iowa, to whom we again take occasion to express our thanks 

 for their assistance. The identification of the 1903 specimens was performed by Prof. 

 Nutting, that of the subsequent material by Prof. Hargitt. A comparison of the deter- 

 minations made by these two authorities revealed certain differences of opinion, some of 

 which were later adjusted. In other cases, such differences are indicated in the text. 

 Prof. Hargitt was present at the laboratory as a member of the investigation staff dur- 

 ing the summers of 1905 to 1909, inclusive, and the records for those seasons are doubt- 

 less on this account more complete than during the two previous seasons of the Survey's 



