490 THE AMERICAN NATURALIST. [Vor. XXXV. 
Myriotrochus. 
Small, 50-60 mm. ; blackish or dusky; tentacles light . M. rinkii Steens. 
Circumpolar; northeastern America as far south as Labrador. Occurs in water not over 
300 fathoms deep. 
Eupyrgus. 
Very small, 10 mm.; grayish . E. Scaber Ltk. 
Labrador, ohne Sp RR quo]: Kara Sea. At i addi of 4-240 fathoms, generally 
on muddy 
Trochostoma (Fig. 1). 
Deposits wanting; ee smooth and leathery; body o 
€ 100 mm. aSa or reddish-white with reddish-brow 
atc T oan Stimp. 
Coast of southern California. 
With colorless calcareous tables, more or less 
imperfect (Fig. 17), in addition to the ellipses 
T. boreale (Sars) 
An Arctic species, reported from the coast of Florida, Lesser 
Antilles, and Maine. Verrill’s Molpadia itm probably 
this species, was taken at various points on the lan 
coast up to the Gulf of St. Lawrence, in 40-100 nied 
Deposits, reddish- 
brow 
the animal a dark 
red color; skin Without tables . . . . . . T. ooliticum (Pourt.) 
grayish. 
Boston, Block Island, Boon Island. Very possibly identical 
L with "as Pom eding. 
Caudina (Fig. 2). 
Medium size, 50-100 mm.; about oce duet plea of the long, 
C. arenata (Gould) 
New England coast, Revere Beach, — Manan d, SEEN and Vineyard Sound. 
Occurs buried in the sand in shallow wa 
Psolus (Figs. 3 and 4). 
Body subcylindrical; ( Dorsal 
perisome without large plates; with 
anal region elon- 
numerous minute da plates and roun: 
edly conical granules . . . . . P regalis Veral 
caudiform; pedi- Banks of Newfoundland, in [x fathoms. 
cels in three j 
complete rows on Dorsal perisome with a mr scal 
ventral surface imbricated P, Alenteon: "(Struss.) 
i North Atlantic and Arctic oceans; on American coast as far 
L south as Massachusetts ; occurs from low water to 130 fathoms. 
