12 PROCEEDINGS OP THE NATIONAL MUSEUM vol.80 



four largest hauls were obtained in bottom nets near the inner end 

 of the bay where the salinity was quite low. 



The two species of Centropages were manifestly winter forms, 

 since they were entirely lacking at many of the stations during the 

 summer, and often early in autumn and late in spring. They ap- 

 peared during the autumn, were present practically throughout 

 the bay during the entire winter, and remained into the spring. 

 O, haniatus continued into the summer in the outer bay, and at three 

 stations there it was even recorded as most abundant during the 

 summer. G. typicu^ was found by Fish to be a summer form at 

 Woods Hole and liamatus a winter form. Williams also found the 

 latter species at Narragansett Bay during January and February. 



Harpacticus gracilis was also a winter form in the outer bay, but 

 m. the inner bay it continued into the spring, and some of the spring 

 hauls yielded more specimens than those of the winter. 



Ldbidocera aestiva was an autumn copepod, appearing in the inner 

 bay only during October, except a few stragglers obtained in Decem- 

 ber. In the outer bay it was more abundant in winter but was oc- 

 lasionally found in summer. It was also obtained August 21, 1921, 

 at depths of 40 and 67 fathoms in the outside ocean. It was given by 

 Wheeler as common at Woods Hole during July and early in August. 

 Fish included it in his list of Woods Hole species as " a southern 

 )ceanic form blown in by winds from the Gulf Stream during warm 

 weather." 



Oithona hrevicomis was fairly well distributed throughout the 

 year, but it may be called a summer form in the outer bay and a 

 ispring form in the inner bay. In the outer bay it also occurred 

 ibundantly during the autumn and winter, but in the inner bay it 

 was often exclusively a spring form and was not found at all at 

 other seasons of the year at many of the stations. The two largest 

 hauls of this species totaled 2,000 specimens each and were made one 

 ;at Station C in October and the other at Station F in December. 

 Station F is one of the three in the mouth of the bay, and Station C 

 s only a short distance inside. 



In contrast with the preceding species, Oithona similis was a 

 pronounced winter form in both portions of the bay, being confined 

 at many stations exclusively to that season. It was occasionally 

 found also during the summer and autumn, but every large haul was 

 made during the winter. This species was found in small numbers 

 by Wheeler at Woods Hole in July and by Williams at Wickford, 

 R. I., in the summer. Fish listed both species of Oithona as summer 

 forms for the Woods Hole region. 



Paracalanus was most abundant in autumn in the outer bay, 

 appearing late in summer and lasting into the winter. In the inner 



