14 PROCEEDINGS OF THE NATIONAL. MUSEUM vol.80 



Oncaea minuta proved to be a summer form, appearing only once 

 during the autumn. It was also obtained in summer, both at the 

 surface and at the bottom, on the 100-fathom line in the outside 

 ocean. Teuiora turhinata was entirely confined to autumn and winter, 

 and with a single exception was found only in the inner bay. 



Among species restricted to a few localities Alteutha depressa, 

 Cletodes longicaudatus^ Corycella carinata, Gryptopontius gracilis^ 

 Dactylopusia hrevicornis^ Diosaccus tenuicornis, Ectinosoma nor- 

 mani, Harpacticus chelifer^ MicroseteUa norvegica, Oithona spiniros- 

 tris, and Temora longicornis were obtained only in winter. Canda- 

 cia, Rohertsonia, and Tisbe appeared in spring, Ganuella and Hemi- 

 cyclops late in spring and summer, Corycaeus elongatus, Temora dis- 

 <audata, and Metacyclops in autumn, Corycaeus venustus three times 

 in autumn and once in winter, Harpacticus littoralis once in autumn 

 and twice in winter, Labidocera wollastoni and Pontella pennata 

 once in summer, Pontella raeadii once in winter and three times in 

 summer, and Taehidius once in autumn and once in winter. 



Fish has listed Alteutha and Dactylopusia as summer species and 

 MicroseteUa and Tishe as winter species in the Woods Hole region. 

 The new species of Pontella is also found there very commonly in 

 summer and early in autumn. 



To summarize, there were 3 species taken only in the spring, 3 only 

 in the summer, 4 only in the autumn, and 18 almost only in the 

 winter. The remainder showed a mixed seasonal distribution, being 

 often more abundant at one season in the outer bay and at another 

 season in the inner bay. 



BREEDING SEASONS 



Considered as a whole, the copepods showed a well-marked rhythm 

 of development, which probably recurs yearly but whose seasonal 

 proportions may vary considerably from year to year. There were 

 apparently four breeding seasons, which were grouped about the 

 months of January, April, July, and October. Each season begins 

 toward the last of the month preceding and continues into the 

 month following. 



The first evidence of these breeding seasons was found in the 

 presence of egg cases upon the adult females. Among the speci- 

 mens captured during each of these breeding seasons there were al- 

 ways some, and often many, bearing eggs. For the January period 

 were found such females of the two species of Acartia, the two 

 species of Centropages, Euryteniora hirundoides, Oithmiu hrevi- 

 comis and O. similis^ Paracalanus and Pseudocalanus^ and the new 

 species of Crypt op ontius. During the April period were found 

 egg-bearing females of Ectinosoma curticorne, Microthalestrls, Psevr- 



