PLANKTON OF THE WOODS HOLE KEGION 
139 
appeared on July 16, it being the only specimen taken that year. In Narragansett 
Bay the season is usually completed in a few weeks in late June; after that hardly 
a ripe adult can be found. As four species of Asterias have been recorded from 
Woods Hole it is probable that all do not breed at the same time. This might 
accoimt for the extended breeding season. 
A specimen of LeptosT/napta inhserens (Miiller), 20 mm. long, was taken on 
September 19 after a hard northeast storm. This was not a free-swimming form 
and would not normally occur in surface collections. 
CRUSTACEA 
PHYLLOPODA 
Two species of marine Phyllopoda (Podon leuckarti and Evadne nordmanni) 
have been recorded from the Atlantic coast of the United States. D. L. MacDonald 
records three species from St. Andrews, New Brunswick, two of which {E. spinifera 
Miiller and Podon finmarchichus) have never since been taken. As the name of 
the original describer does not appear on the list, I am unable to find any other 
record of P.jinTnarchichus. This name is not given in any available literature on the 
subject. E. spinifera is a southern form that has not appeared in this region during 
the past year. 
Two species of Evadne were taken at Woods Hole in abundance during the 
summer of 1922. Evadne tergestina, new to this region, appeared on May 20, be- 
coming very numerous by July 1 . During the summer diatom maximum the num- 
bers decreased but rose again in September. After that they declined until Novem- 
ber, the last being recorded on November 15. 
Evadne nordmanni appeared shortly after E. tergestina, but never became 
abimdant in the summer months (fig. 37, p. 138). In October they increased and 
reached their highest point about November 1, at a time when E. tergestina 
was fast disappearing. Throughout December they declined rapidly and disappeared 
about January 20. E. nordmanni is easily distinguished by its pinkish color as 
well as its different appendage formula. E. tergestina is usually quite colorless 
and very transparent. 
Podon intermedins was first recorded from the western Atlantic by MacDonald 
at St. Andrews, New Brunswick. This species appeared in the surface collections of 
Great Harbor on May 27, 1922, and increased rapidly, reaching a high point in the 
last week of June. The numbers declined during the period of the diatom swarms, 
but rose again, reaching the peak in the middle of September. Another diatom 
maximum in early October reduced the number a second time, but they once more 
rose and remained until the last of the month. During November P. intermedius 
became scarcer and disappeared about December 15. In general, the season is the 
same for the various species. Evadne nordmanni has the longest occurrence. The 
distribution of P. intermedius in 1923 was very similar to that of the previous year, 
except that it arrived later (fig. 38) . 
No specimens of Podon leucTcarti (Sars) were taken during the past year, and a 
careful search through the collection of 1899 and 1900 failed to show any, although 
