[Ill] 



Animal slate colored, body cylindrical, rugose, tentacles 

 moderate; foot elongated, behind wedge-shaped. 



Shell — large diameter 0-96 to 1-20 ; smaller diameter 0-76 to 

 0-9t) ; height 0'42 to 0-54 hundredths of an inch. 



Santa Cruz, Cal., among decayed trees in the dampest places. 



This beautiful species is quite rare, only nine adult and 

 twelve young specimens having been found after long searching. 

 It will probably occur more commonly in some part of the red- 

 wood forests which I have been unable to explore. It approaches 

 nearest to S. Dupetithouarsi and H. fidelis, being between them 

 in form and size as well as color, but the pilosity at once dis- 

 tinguishes it. Its distinct bands and rounded whorls separate 

 it from H. infumata and HilUbrandii, the latter when perfect 

 having also much longer hairs. The animal is lighter colored 

 than those of H. arrosa, NicJcliniana, redimita, ramentosa, tudicu- 

 lata (which are all very similar), but much darker than that of 

 Dupetithouarsi, and I believe also oi fidelis and infumata. The 

 form of the shell is a link connecting these with Mormonum." — 

 Proceedings California Acad. Nat. Sci., April, 1866. 



Through the kindness of Dr. Wesley Newcomb, of Oakland, 

 California, I am enabled to give figures from his types of several 

 species, which I was not able to illustrate at the time they were 

 described. 



Aglaja Ayresiana, Newcomb, sp. 7. Plate 11, fig. 28. 



This species comes from the Island of Sta. Cruz ; the locality 

 originally given by Newcomb is incorrect. It is thus a sub- 

 tropical, and not a boreal species. 



Aglaja Bridgesii, Newcomb, sp. 11. Plate 11, fig. 29. 



Aglaja Rowellii, Newcomb, sp. 18. PI. 11, fig. 30. 



Aglaja Gabbii, Newcomb, sp. 17. Plate 11, fig. 31. 



I re-figure this species from a specimen received from Dr. 

 Newcomb, the original figure, pi. 6, fig. 19, being unsatisfactory 

 and more like the following species, to which Crahbii is closely 



15 



