W. G. Van Name — Bermuda Ascidians. 383 



Goodsiria placenta Herdman, which forms pedunculated colonies 

 and has a folded branchial sac with numerous longitudinal bars.) 



Synstyela monocarpa Sluiter, from South Africa, which is included 

 by Michaelsen in Gynandroearpa, is however closely related to the 

 form here described, and is better placed in this new genus than in 



Gynandroearpa, and I have so defined the genus that it may be 

 included. Possibly one or two other species might also find their 

 place here. Synstyela Giard is rightly rejected by Michaelsen as too 

 poorly defined to be certainly recognized. 



Diandrocarpa botryllopsis, n. sp. 



Plate LIV. Figure (58. Plate LIX. Figures 120 and 121. 



Plate LX. Figure 123. 



The colonies are very thin, seldom averaging over 2 mm thick, 

 though the surface is slightly raised over the position of each zoOid. 

 In outline they are very irregular, but sometimes measure 60 mm or 

 more in the longest direction. Frequently they break up into a 

 number of small colonies, which may remain slightly connected. 



The test is very soft and gelatinous with a slightly tougher outer 

 layer. It is transparent and almost colorless after death, but in the 

 living and expanded animal it has more or less of the dark color of 

 the zooids. The reason for this is not clear, but it may be due in 

 part to greater distension of the test vessels with colored corpuscles 

 in the living animal. These vessels are quite numerous, especially 

 in the marginal parts of the colony, and have club-shaped terminal 

 bulbs, but the latter are not proportionately very large. 



The zooids reach about 2.5 m,n in length and 1.3 mm in width, or 

 slightly larger when fully expanded. They lie on their ventral sur- 

 faces, and have the branchial aperture close to the anterior end and 

 the atrial near the middle of the body. The apertures project but 

 little and are elliptical, with the long diameter parallel to the long- 

 axis of the body, and without lobes, but sometimes with minutely 

 denticulate edges. 



Their color (due chiefly to corpuscles contained in their vessels 

 and in the mantle) is blackish, or some shade of dark purplish brown 

 or brown, sometimes even dark olive. During life the branchial 

 aperture is surrounded by an area of white pigment, or sometimes 

 greenish white, pale salmon, or pale yellow. This has an irregularly 

 stellate outline, and there is also considerable of the light pigment 

 over the region of the ganglion and in small dots at various points 

 on the mantle and on the bulbs of the test-vessels. This pigment 



