494 THE AMERICAN NATURALIST. [Vor. XXXV. 
Thyone. 
Deposits in body wall wanting . . . . . . . . . . TZ briareus (Less.) 
Dark brown, almost black; 150 mm. ; in mud, Cape Cod to Texas. 
Deposits in the form of tables . . eo. LD. seabra Verr 
Brownish; 5o mm.; coast of New Kp to i Clasp Bay. 
Deposits small reticulate cups and uneven oval buttons with four holes 
T. gemmata (Pourt.) 
Body spindle-shaped, dusky brown ; North Carolina to Brazil (?). 
Deposits unperforated rods . . . . T. elongata (Ayres) 
Banks of Newfoundland, in anes fathoms; Massachusetts Bay (?). 
Deposits crowded oval buttons with four holes . . . . Z. unisemita (Stimp.) 
Brownish-gray ; 60-75 mm.; coast of New England from Nantucket northward. 
Deposits buttons with four holes, and very numerous ~ complex 
tables T. rubra Clark 
Red above, whitish below; 20 mm. ; viviparous; Pacific Grove, Cal. 
Orcula. 
Size medium, 65 mm.; brownish ; deposits wanting . . . O. darthii Troschel 
Labrador, Greenland, and the Arctic Ocean. 
Thyonidium. 
Size small, 15 mm.; pale yellowish; deposits few . . . 7: productum (Ayres) 
Eastport and Grand Manan. 
Miilleria. 
Tentacles 20; deposits tables and buttons . . . . . . . M. parvula Sel. 
Chestnut-brown; 5o mm.; Florida 
Tentacles 2 TES tables and buttons wanting; yes small branched 
rods M. agassizii Sel. 
Light brown mottled with darker; 300 mm.; Florida and West Indies. 
Stichopus. 
Tables with round perforated disk; no buttons . . . . . S. dadionotus Sel. 
Olive green or olive brown; 200 mm. ; Florida 
Tables without disk; no buttons. . . 20. S. sitchensis (Brandt) 
9o mm.; Alaska. The status of this species is doubtful. 
Tables with well- rds disks; numerous buttons with nine pairs ©: 
holes . S. cali Veri oe 
Brown; 300 mm.; coast of ries: Pet Sound. 
