The Nautilus 
VOI- VIII. 
NOVEMBER, 1894. 
No. 7 
DESCRIPTION OF A NEW SPECIES OF DORIDIUM FROM 
PUGET SOUND. 
BY W. H. BALL. 
Among specimens of mollusks collected in Puget Sound by the 
Young Naturalists’ Association of Seattle, Wash., and forwarded 
for identification by Prof. O. B. Johnson,was a species of Doridium, 
a genus new to the region, and detected by Miss AdellaM. Parker, 
in whose honor, at the request of the society, it has been named. 
The specimens were dredged in 80 fathoms at Eagle Harbor, Puget 
Sound. 
Doridium adellse n. sp. 
Animal naked, about 16 mm. long, of a dark plum color, mottled 
with fine vermiculate spots of golden yellow; general form that of 
D. carnosum Cuvier, but with a shorter velum, half as long as the 
body and transversely truncate behind; the posterior free portion of 
the mantle short, obscurely bilobed, and without a flagellum ; front 
edge of the velum slightly excavated ; parapodia wide, the sole 
slightly longer than the body; shell internal, subconical, white 
covered with a brownish epidermis; pillar strong, reflected with a 
deep grove outside of it, the basal end projecting spurlike; nucleus 
small, depressed. 
The shell is more conical and the cycloid wall of it narrower than 
in D. carnosum, and the excavated pillar much more prominent. 
