102 bulletin: museum of comparative zoology. 



four fragmentary specimens of the hydromedusa Halopsis ocellata, 

 taken at Stations 15, 22, and 23. This species, first discovered in 

 Massachusetts Bay (A. Agassiz, 1865, p. 102) has since been recorded 

 only once, by Fewkes, (1888), who found it in considerable numbers 

 "near the wharves at Grand Manan." The chief point of interest 

 about this species is its otocysts, for though Agassiz figured them (1865) 

 it has remained questionable whether they are open or closed, and 

 consequently Browne, (1910) found it impossible to refer the genus 

 definitely either to the Mitrocomidae or to the Eucopidae. Fortu- 

 nately our specimens, though much battered, show these organs well, 

 and it is easy to demonstrate that they are open pits. The opening 

 is evident on surface views of the oral side of the velum, and large 

 enough to admit a fine bristle. Consequently Halopsis is a mitro- 

 comid. The specimens agree with Fewkes's statement as to the inde- 

 pendent origin of the radial canals from the stomach (in the original 

 account they are described as arising in four groups). 



Our run out to Piatt's Bank showed that very few fish were spawning 

 except close to the shore, for the tows at Station 23, on the bank, 

 contained no eggs at all, nor did we meet any over the deep trench a 

 few miles further south (Station 24), while very few were found over 

 Jeffrey's Bank (Station 25) except for a Lophius veil, with the eggs 

 nearly ready to hatch, which we picked up from the surface at this 

 station. And to complete the brief survey of fish eggs I may add that 

 very few were taken at any of our stations further north or east; none 

 at all at the off-shore stations over the Eastern Basin (Stations 27, 28) 

 on German Bank (Stations 29, 30), off Lurcher Shoal (Station 31), off 

 Mt. Desert Rock (Station 32) or in the Grand Manan Channel. 



On the other hand we captured 190 larval red fish (Sebastes) on 

 Piatt's Bank (Station 23); 18 at Station 27, 61 at Station 28; and 27 

 at Station 32; but it was not taken on Jeffrey's Bank (Station 25); 

 nor along the coast from Grand Manan to Penobscot Bay (Stations 

 33 to 39). 



At our off-shore hauls the plankton repeated, in a general way, the 

 conditions met nearer land, Calanus with a few other copepods, 

 notably Euchaeta norvegica and Anomalocera patersoni, still forming 

 the bulk of the hauls (Stations 23, 24, 27, 28). But the haul from 

 twenty fathoms at Station 23 yielded an important addition to the 

 list of copepods, in the Arctic Calanus, C. hyperboreus, represented by 

 six specimens among the thousands of C. finmarchicus. We now 

 met Meganyctiphanes more regularly, considerable numbers of this 

 schizopod being taken at Station 27, 80-0 fathoms. And at Station 



