W. G. Van Name — Bermuda Ascidians. 339 



branchial sac narrow and borne on stout connecting ducts. No 

 horizontal membranes present. The meshes between the internal 

 longitudinal bars contain two or three stigmata. On each side of the 

 dorsal lamina (which consists of a row of narrow tentacular languets) 

 there are no internal longitudinal bars for a space of about ten stig- 

 lii tta, but there is a papilla on each transverse vessel at about half 

 this distance. 



Tentacles simple and filiform. They are of three lengths placed 

 regularly. Dorsal tubercle elongated and tapering posteriorly. Its 

 aperture is anterior, and the horns are coiled. 



Genital glands in the intestinal loop. Ovary alongside and curved 

 parallel to the intestine. Testis in the concavity of the ovary. 



The young individuals obtained by the writer do not exceed 

 gmm j n ] eil gth. Most of them are smaller. The test and mantle 

 are very transparent and the latter contains branching vessels similar 

 to those in Perophora. 



In life the color is a pale greenish yellow, due to corpuscles of 

 that color in the vessels of the branchial sac and mantle. It becomes 

 brown in preservation. 



The body and branchial sac are much shorter than in the adult; 

 none have over 18 or 20 rows of stigmata. There are two sizes of 

 tentacles. The apertures appear lobed, but these may merely be 

 folds produced by contraction of the strong sphincter muscles. 



None of the individuals had repi'oductive organs developed. 



The type specimen of this species was obtained by the Challenger 

 Expedition at Bermuda in shallow water. Herdman also states that 

 there are several colonies in the Liverpool Free Public Museum from 

 Alexandria Harbor (3 to 5 fathoms). It also occurs at Jamaica 

 (Lefevre 9). 



The young specimens collected at Bermuda by the writer were 

 mostly found under stones along the shores of Castle Harbor and at 

 Coney Island, during the month of May. 



Family DISTOMIDiE Giard, 1872. 



Colony generally thick and massive, sometimes pedunculated. 

 Systems often wanting. Zooids usually completely imbedded in the 

 common test. 



Zouids having the body divided into two distinct regions, — thorax 

 and abdomen. From the posterior part of the latter vascular pro- 

 cesses usually extend into the test, and upon these the buds form. 



Branchial sac without internal longitudinal bars or folds. Dorsal 

 lamina in the form of a series of languets. 



