DORIS PILOSA. 



present to merge it also among the varieties of this difficult species, leaving it to time to show 

 if any "permanent difference can be substantiated. Boris rocinela and D. ochracea, of Leach, 

 specimens of which are preserved in the British Museum, appear to be varieties of B. pilosa. 



The breeding season of this species commences in April, but the spawn is not abundant 

 until May or June, and patches may occasionally be found as late as September; it is 

 of a pretty cup-like form, with the margin turned outwards, and in some cases a little 

 flounced. The ova, which are small and whitish, are very numerous, and arranged in distinct 

 transverse lines. 



Boris pilosa inhabits the littoral and laminarian zones, and is often found further above 

 low-water mark than most of its congeners. It is comparatively active, and is with difficulty 

 kept alive in confinement, from its propensity to crawl out of the water. Its range, as far 

 as we at present know, is confined to the Atlantic shores of Europe. 



The heart pulsates about sixty-eight times in a minute. 



Figs. 1, 2, 3. Doris pilosa, different views. 



4. A portion of the cloak, highly magnified. 



5. Dorsal tentacles. 



6. A branchial plume. 



7. Spicula. 



8. Anal nipple. 



9. Spawn. 



10. A portion of the same, showing the ova. 



