W. G. Van Name — Bermuda Ascidians. '.45 



grains. This coating of sand generally ceases abruptly at the top 

 of the peduncle. The interior of the colony is usually nearly free 

 from sand or shell fragments. 



The zooids are light colored, with the stomach and part of the 

 intestinal loop orange. The mantle is less pigmented than in D. 

 convexum, the spots are blackish and exceedingly minute, and it is 

 usually only on the anterior end just over the ganglion and over the 

 end of the endostyle that they are sufficiently numerous to conceal 

 the whitish ground-color of the mantle. These two points, however, 

 are in most individuals practically black, so thick is the spotting, 

 and they are visible through the semi-transparent test (especially in 

 light-colored colonies) as black dots, and in many of the specimens 

 are the most conspicuous parts of the zooids. 



In structure the zooids resemble those of D. convexum. This 

 applies also to the structure of the gland surrounding the intestine. 

 They average, however, somewhat smaller and slenderer than those 

 of D. convexum, as a comparison of figs. 9 and 16, drawn to the 

 same scale, will show. There are the same number of rows of stig- 

 mata (four) but fewer in each row. There are also fewer tentacles. 

 There are a dozen or more quite long slender ones, also some small 

 ones inserted further forward. 



None of the zooids examined contained embryos in advanced 

 stages, or very large eggs. 



This species was not among those collected in 1898. In 1901, 

 however, it was abundant, especially on corals in Harrington Sound, 

 but common also under stones along the shore at various places, 

 including Coney Island, Long Bird Island, and Hungry Bay. It 

 appears, though, to prefer deeper water rather than situations near 

 low-water mark. 



Distoma clarum, n. sp. 



Plate XLVIII. Figure 10. Plate LIX. Figure 117. 



Colony jelly-like, the test usually colorless and transparent in pre- 

 served specimens. In life, however, it is slightly opalescent with a 

 greyish, pinkish or sometimes a blue or green cast. The colony is 

 simply a rounded or oval mass without a peduncle, attached by most 

 of the under surface. It seldom exceeds I2 ram in width and half 

 that in greatest thickness. The zooids, which are irregularly placed 

 and lie at all angles to the surface (no systems being discernible), 

 are visible through the test with perfect distinctness. 



