MARINE BIOLOGICAL STATION AT PORT ERIN. 79 
shear-net ran into hundreds, as follows :—-860, 125, 286, 
310, 200, 200, 400, 400, 300, 800. The fact, however, 
that the weighted tow-net, not invariably, but usually, 
took a much larger number than the similar surface nets 
shows that Sagztta is usually more abundant in a zone of 
water below the surface, extending down to ten fathoms, 
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Fic. 23. Curve for larval Balanas in 1907. 
and that consequently the much greater numbers obtained 
by the shear-net may be due not wholly to the size of the 
net and mesh but in part to the depth at which it was 
worked. 
The Nauplius and Cypris stages of Balanus form an 
interesting study (fig. 23). The adult Barnacles are 
present in enormous abundance on the rocks of Bradda 
Head, and they reproduce in winter, at the beginning of 
the year. The newly-emitted young are sometimes so 
abundant as to make the water in the shore pools 
appear muddy. The Nauplii first appeared in 1907 
in the bay gatherings on February 22nd (in 1908 
on February 13th), and increased with ups and 
