VAN NAME: SIMPLE ASCIDIANS. 449 
21. Caesira pannosa (Verrill), 1871. [Molgula pannosa Verrill]. 
Gulf of Saint Lawrence; Bay of Fundy region; Casco Bay; George's 
Bank. 
10 to 80 fathoms. 
22. Caesira citrina (Alder and Hancock), 1848. [Molgula liltoralis Verrill]. 
Northern and western Europe; Gulf of Saint Lawrence; Saint Peter's 
Bank (south of Newfoundland); Bay of Fundy region; southward to 
off Martha's Vineyard, and Narragansett Bay. 
Littoral to 126 fathoms. 
23. Caesira cryslallina (Moller), 1842. [Pera pellucida Stimpson; P. crys- 
tallina Verrill]. 
Arctic seas; Norway; Iceland; Greenland; etc. Nearly circumpolar. 
Gulf of Saint Lawrence; George's Bank. 
10 to 180 meters. 
24. Caesira papillosa (Verrill), 1871. [Molgula papillosa Verrill]. 
Arctic seas (Bear Island, Hope Island, Faroe Islands, Greenland). 
Gulf of Saint Lawrence and Bay of Fundy to off Martha's Vineyard. 
10 to 100 fathoms. 
25. Caesira arenata (Stimpson), 1852. [Molgula arenala Verrill; Ascidia 
psammophora Agassiz]. 
Nantucket, Vineyard Sound, and Buzzards Bay to Long Island Sound 
(near New Haven, Conn.). 
3 to 15 fathoms. 
26. Caesira robusta, sp. nov. 
Region about Wood's Hole and Martha's Vineyard, Mass. 
Shallow water. 
27. Caesira retortiformis (Verrill), 1871. [Molgula retorliformis VerriUj. 
Waters of northern Europe and Asia, Iceland and Greenland, Alaska. 
On the American Atlantic coast south to the southeastern angle of Cape 
Cod. 
Shallow water to 150 fathoms. 
— . Caesira verrilli, sp. nov. 
Deep water. One specimen only, from N. lat. 40° 24', W. long. 66° 04', 
1,769 fathoms. 
28. Caesira singularis, sp. nov. 
Off Race Point, Cape Cod, to Long Island Sound. 
14 to 27 fathoms. 
— . Caesira producta (Stimpson), 1852. Uncertain species. 
Massachusetts Bay to east of Block Island, R. I. 
Low water to 29 fathoms. 
Note. — Caesira sordida (Stimpson), 1852, has been attributed to the New 
England fauna through an oversight only. 
