346 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
12. Aplidimti pallifhiDi (Verrill). [Anifiroccinm pnUidum Verrill.] 
Newfoundland and the Gulf of St. Lawrence; coast of New England, 
chiefly north of Cape Cod, l)ut locally to southern Massachusetts and 
probably Rhode Island. A. lacteum Huitfeldt-Kaas, 1896, of northern 
European waters, is veiy probably identical with this species. 
Low water to 126 (in one case 471) fathoms. 
13. Amaroucium pellucidum (Leidy). 
Southern Massachusetts, Rhode Island, and Connecticut. [North 
Carolina, according to Verrill.] 
Greatest depth, 12 fathoms. 
13a. Atnarouciutn pellucidum form constellatum (Verrill). [.-1. constellatum 
Verrill.] 
New Hampshire, to Long Island Sound. 
Low water to 18 fathoms. 
14. Aitiarouciut?! (jiabrum Verrill. 
Newfoundland and the Gulf of St. Lawrence: coast of New England, 
chiefly north of Cape Cod, but locally to southern Massachusetts and 
Rhode Island. A very clo.sely allied, if distinct, form (A. translncidum 
Ritter, 1901) occurs in northern European, Asiatic, and Alaskan waters. 
Low water to 80 fathoms. 
15. Amaroucium stellatum Verrill. 
Southern Massachusetts. [North Carolina, according to Coues and 
Yarrow.] 
Shallow water. 
In this pajDer seven of these species are considered as identical with 
previously described European species, while with four of the others 
subsequently described European species may be identical. 
ka far as their distribution in the New England and eastern Cana- 
dian region is concerned these species may, if we except the deep- 
water Leptoclinides faerdensis, be divided into two groups, a northern 
one composed of 
Botrylloides aureum Sars. 
Polycitor kukenihali (Gottschaldt). 
Holozoa clavata (Sars). 
Telradidemnum. albidinn (Verrill). 
Didemnopsis tenenan (Verrill). 
Lissoclinum aureum Verrill. 
Macroclinum pomum (Sars). 
Aplidium pallidum (Verrill). 
Amaroucium glahrum Verrill. 
