CoLGAN. — Phototropism and Eye- Spots in Lincus, II 
They range from ten to twelve, and are placed not across 
the head, but along the head-mar gms, five or six on each 
side. As the worms hatched out early in May last lived with 
me up to the following 28th June, I was enabled to observe 
at least the earlier stages in the transition from the two 
symmetrically placed transverse eye-spots of the young 
Lineus to the numerous marginal spots of the adult. On 
the 4th June in several individuals the original dense eye- 
spots showed signs of breaking up, while small accessory 
specks made their appearance at some distance from them 
and usually nearer to the head -margins. Two days later 
several other specimens were examined. In these the 
original eye-spots had become a loose aggregation of 
blotches and specks accompanied in some instances by 
spots much larger th?n the components of the old eye -spots 
and placed closer to the head-margins. In some individuals 
a constellation of minute specks, a sort of ocular Pleiades, 
was observed lying outside of the old eye -spot and 
apparently the result of its dissolution. Such groups of 
of close-set specks only needed a coalescence of their mem- 
bers to originate the secondary marginal eye -spots of the 
adult. These changes in the form of the original eye -spots 
suggested that the transition from the binocular immature 
state to the multocular mature state was effected, not by 
the development of new eye -spots from previously un- 
pigmented tissue, but rather by the disintegration of the 
original spots, succeeded by a re-integration of the frag- 
ments for the formation of the ultimate marginal spots of 
the adult worm. Mcintosh (" Monograph," Part I., p. 119) 
found change in the eye-spots to be much less rapid. " Ten 
weeks afterwards " [after hatching], he says, the young 
animals .... still possess only two eyes, rarely an additional 
pigmentary fragment." 
The highly developed positive phototropism of the young 
Lincus gesserensis, its tendency to seek the light, is not 
shared by the adult. Dr. Oxner, in a paper published 
in the Bulletin de Vlnstitut Oceanographique in December, 
1907, declares as the result of observations made on marine 
gatherings kept in basins of sea water that Lineus ruber 
( =L. gesserensis) is negatively phototropic in a high degree ; 
