VAN NAME: COMPOUND ASCIDIANS. 365 
thin-walled. The irregular folds into which its walls are thrown in 
the preserved specimens are probably entirely due to the contractions 
incident to preservation. 
The testis consists of a group of about twenty pyriform glands in the 
left posterior part of the abdomen and lies for the most part posterior 
to the intestinal loop. The ovary (poorly developed in most of the 
specimens examined) consists chiefly of a group of eggs of various 
sizes, and is situated just anterior to the testis. A few of the speci- 
mens contained one or two large embryos in the anterior part of the 
abdomen. 
The writer identifies the above described specimens with this rare 
northern European species rather than with the better known P. 
crystallinum, widely distributed in European waters, which forms 
colonies of similar size and shape, chiefly on account of the structure 
of the branchial sac, P. crijstaUinum being described as having from 
9 to 15 rows of stigmata (Hartmeyer, 1903, p. 310). P. kiikcnthali 
was described by Gottschaldt (1894) from two specimens from Spitz- 
bergen, 8 to 10 fathoms, and was for a long time not found again, but 
has recently been recorded by Redikorzew (1907a, 1908a) from the 
Murman coast. It has been taken at a depth of 3<)5 meters (Hart- 
meyer, 1909). 
The American specimens, about thirty in niunber, are all from 
Station 2699 (off Newfoundland, N. lat." 45° 04', W. long. 55° 23', 
72 fathoms, Aug. 22, 1886). except two. These also are from localities 
off Newfoundland: Station 2693 (N. lat. 46° 53', W. long. 44° 39' 30", 
78 fathoms, Aug. 11, 1886) and Station 2694 (N. lat. 46° 52' 30", 
W. long. 44° 54' 30", 86 fathoms, Aug. 11, 1886). The colonies were 
mostly attached to small stones, gravel, and Boltenia stems. A 
majority of the specimens are small and poorly developed. 
Genus Holozoa Lesson, 1830 [= Distaplia Delia Valle, 18S1]. 
Form of colony very variable, most frequently capitate' or club- 
shaped. Test without spicules. Zooids with a large branchial sac 
having four rows of stigmata, each row with a delicate intermediate 
transverse vessel crossing (but without interrupting) all the stigmata. 
Digestive canal forming a simple, not twisted, loop. Reproductive 
glands on the right side of the abdomen. When a zooid contains 
developing embryos, a long tubular tapering diverticulum of the peri- 
