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BIGELOW: EXPLORATIONS IN THE GULF OF MAINE. 121 
Thus it was inhabiting rather warmer water than Clione (47°-52° 
as against 41°-57°), but of about the same salinity; and the capture 
at Station 30, on the surface, is particularly interesting, because 
Salpa fusiformis was likewise taken at that Station. The other cap- 
tures of Limacina were in open nets from 20-30 fathoms. Unlike 
Clione, the specimens were of various ages; a swarm of small ones 
being taken at Station 19, the largest at the last Station at which it 
occurred, 7. e., 40. This suggests that its chief period of growth is 
July and August in the Gulf. : 
Salpae (Plate 5).— Salpae were observed over only a small area, 
from Station 30 to Station 31; several S. fusiformis being taken at 
‘each Station, and others seen floating on the surface. But a large 
haul of S. mucronata was made twenty-five miles off Chatham, on the 
surface, September 30, by Capt. John McFarland of the fishing 
schooner Victor. The geographic importance of these hauls has been 
noted (p. 107). 
Tomopteris helgolandica. ‘This is the only species of the genus 
encountered, and was taken at Stations 11, 14, 30, 32, 40, 42, and 44, 
2. e., in Massachusetts Bay, north of Cape Ann, off Cape Porpoise, 
off Mt. Desert, on German Bank, off Seguin, and once in the Kennebec 
River. It was not taken in any of the off-shore hauls. The known 
salinities and temperatures are:— 
Station 30 surface temperature 52° salinity 32.7%o 
Station 32 _ surface temperature 57° salinity 32.5%o 
The other captures were in open nets from considerable depths (20- 
60 fathoms). 
Chaetognaths.— Sagittae were taken in greater or less numbers at 
almost every station. But the determination of most of the species 
of this genus is so difficult that only four, Sagitta serratodentata, S. 
elegans, S. lyra, and Eukrohnia hamata have been selected, as being 
so easily recognized that the records can be depended upon. And 
the identifications of these have been verified by Mr. E. L. Michael. 
Sagitta serratodentata, especially, is a useful index-species, because the 
serrate margins of its jaws separate it from all its allies. Among the 
Sagittae in the Grampus collection it is likewise readily identified by 
its stiff, slender body, and very large spermaries. * 
Sagitta serratodentata (Plate 5) was taken at Stations 19, 21, 22, 23, 
25, 27, 28, 30, 31, 32, 33, 36, 38, 40, 41, 44, but not in any of the bays 
or harbors, or in the Grand Manan Channel. ‘The list of stations 
shows that it occurred very generally over the Gulf, ¢. ¢., in Massa- 
