ANIMAL DISTRIBUTION FOLLOWING A HARD WINTER. 99 



upon animals near the northern limit of their geographical range. 

 The result of an inquiry as to whether or not such animals were 

 affected is shown in the list given as Table III. The list is made 

 from the class list of invertebrates whose distribution, as shown 

 in Pratt's Manual of Common Invertebrate Animals, is that of 

 southern ranging animals. By "southern ranging" is meant 

 that the known geographical range extends twice as far south 

 as north of the point under consideration. The frequency data 

 is based principally on my own experience in the field assisted 

 by that of Mr. J. S. Kostir, of Ohio State University, who has 

 collected over the same ground for the last two summers. 



TABLE III. 



A List of Species, that are South Ranging according to Pratt. Taken by the Inver- 

 tebrate Class of the Marine Biological Laboratory. The Comments in the Last Column 

 Give the Frequency Data as Compared with the Preceding Summer. 



Species 



Porifera: Range Frequency 



Cliona celata (Grant) S. Ca.-Maine. Fewer. 



.Chalina arbuscula (Ver.) N. Ca.-Cape Cod. Fewer. 



Microciona prolifera (Ellis and Solan- 



der S. Ca. 2 -Cape Cod. Fewer. 



Coelenterata: 



Pennaria tiarella (Ayres) Fla.-Maine. Fewer. 



Schivotricha tenella(Ver.) Beaufort, 1 N. C.-Marthas Vine- 

 yard. No change. 



Dactylometra quinquecirrha (Desor) .Tropics- Vineyard Sound. Comparison 



unfair. 



Sagartia lucice (Ver.) FloridaCape Cod. Fewer. 



Sagartia leucolena (Ver.) N. Ca. Cape Cod. More. 



Eleoactis producta (And.) S. Ca. Cape Cod. Fewer. 



Astrangia dance (Ag.) Fla. Cape Cod. Fewer. 



Nemertini: 



Micruri leidyi (Ver.) N. J. Cape Ann. Fewer. 



Cerebratulus lacteus (Leidy) Fla. Maine. Fewer. 



Echinoderma:. 



Asterias forbesi (Desor) Common south of Cape Cod 



Rare north to Maine. More small. 



Ophioderma brevispina (Say) South from Cape Cod. Fewer. 



Arbacia punctulata (Gray) Yucatan 2 Cape Cod. Fewer. 



Thyone briareus (Lesueur) South from Vineyard Sound. No change. 



Annelida: 



Sthenelais leidyi (Quatr.) N. Ca. Mass. Bay. No change. 



