THE NAUTILUS. 



Ancula crittata sulplwrea (Stimps.), one young specimen of about 

 8 mm., at Brace's Cove. It seems best to prestrve Stimpson's name 

 at any rate in a varietal sense though Bergh has united it with 

 cristata. The differential character of the lower origin of the ante- 

 rior appendages of the rhinophores is fully confirmed by my observa- 

 tion and seems pretty constant. 



Total about 119 individuals, falling into 9 genera and 10 species 



or varieties. 



_».. . 



The picture of local nudibranch life obtained from this bit of 

 intensive collecting is tolerably clear. 



Goryphella rufibranchialis mananensis appears to have been "swarm- 

 ing," not in the sense that it was enormously numerous — for the total 

 figures are not impressive — but in the sense that adults were locally 

 gathered together in far greater numbers than normal and with 

 a distinctly gregarious habit, e. g., six or eight in one pool, none in 

 the next, rarely alone. The specimens ran remarkably uniform in 

 size and lent support to the view that the species is an annual. 

 None were seen in coitu either in the pools or in three days of cap- 

 tivity, but spawn was abundant and probably mating was about over 

 for the year. Alder and Hancock say of the British form: ''met 

 with * * * in April, May and June, when it has attained its full 

 size and is spawning. * ♦ * In August and September the young 

 are found considerably advanced." I believe our form will be found 

 to have a more concentrated breeding season. 



What has been said applies equally to the chocolate variety. 

 Aeolidia papillosa gave some slight indication of "swarming" in 

 that it was considerably more numerous than normal, and gregarious 

 in habit. But this was not nearly as marked as in the foregoing 

 and the sizes were so conspicuously not uniform as to look against its 

 being an annual. What I have seen in this and other years would 

 fit well with its being a bi- or tri-annual with a "swarming" habit 

 slightly later than that of C. mananensis and not so well marked. 

 The spawn was fairly abundant and all of a deep rose color whereas 

 Alder and Hancock say of the spawn of the British form that it is 

 " occasionally white, but generally has a pinkish tinge, and is some- 

 times distinctly rose-colored." They give the breeding season as 

 " spring and summer months." 



The other forms taken present no indication of a sexual " i-warm- 



