A CONTRIBUTION TO THE ANNELIDA. 69 
of the gut. Besides the anterior long bristles, there are 
several pairs on the sides posteriorly, as shown by Claparéde, 
who figures four pairs in Magelona (ibid., Taf. x, fig. 12). In 
a coloured drawing of one at this stage by Mr. J. Pentland 
Smith, M.A., B.Sc., about seven pairs are present. The 
tentacles are longer than the body, and contain only a single 
vessel, as in Claparéde’s stage of Magelona of 2 mm., and no 
circulation is yet visible, though a few stationary corpuscles 
are observed on the wall of the vessel. In this condition the 
Annelid stretches itself freely, with the tentacles widely ex- 
panded, and apparently draws in water by the mouth at 
intervals, to judge from the movements of the gullet. When 
irritated it coils its tentacles like springs, and wriggles rapidly 
through the water, as noticed by Claparéde in Magelona. 
Only slender spine-like papille occur on these elongated 
organs, as in S pio, to which the young form has close affinities. 
No forward growth of the snout has yet taken place, and 
therefore this example would appear to belong to another form 
or to be less developed than Claparéde’s fig. 12. Moreover, 
the eyes are black, not red, and much smaller than he shows. 
The pigment of the body further is white, not brownish, such, 
perhaps, being due to variation. As in other species, such 
forms do not follow the younger in regular succession as 
regards date, for the spawning period is evidently prolonged. 
Thus, for instance, the foregoing example was much larger 
than some examples of Magelona procured at the same time, 
or even than others found in the middle of June. Moreover, 
the shedding of the long larval bristles takes place at different 
periods in specimens of the same or nearly the same age. 
They are absent, for instance, in the example figured in Pl. 8, 
fig. 2, though in other respects it agrees in structure with the 
foregoing. 
On the 17th of October (similar forms, however, having been 
seen earlier) a more advanced specimen of Magelona than 
described by Claparéde was obtained in the bottom trawl-like 
tow-net (PI. 8, fig. 3). The basal part of the tentacles is now 
furnished with larger papille, while the slender processes 
