W. G. Van Name — Bermuda Ascidians. 379 



Distoniida?. Lahille considered that it should be placed in the 

 Botryllidae, and Herdman in his later work has followed him in this. 

 Only a single colony was obtained, and that, as Herdman says, was 

 in poor condition. As far as the writer is aware, the species has not 

 been found since, though through an oversight it was included in 

 Prof. Verrill's (17) statement of the species found in 1898. 



The following details are from Herdman's description : 



The colony consists of heads connected by branching peduncles. 

 The heads are narrow at the lower end and taper gradually into the 

 peduncles. " The color of the head is a dull green with spots of 

 reddish brown scattered here and there. The peduncle is of a dull 

 greyish yellow color." (These no doubt were the colors of the pre- 

 served specimen.) Length of head of average size 12 mm , greatest 

 thickness 7 mm , length of peduncle about 15 mm , thickness 3 mm . 



The test is tough and firm. Muscle bands of the mantle not large, 

 but numerous and running in all directions. The sphincters of the 

 siphons are especially strong. 



The branchial sac is large, with numerous stigmata, and provided 

 with internal longitudinal bars. The dorsal lamina is a plain mem- 

 brane and there are eight tentacles, all of one size. 



The body of the zooid is not divided into thorax and abdomen. 

 The alimentary and reproductive organs form a mass projecting a 

 short distance beyond the branchial sac. The stomach is folded 

 longitudinally and provided with a coecum. 



There are branching vessels in the test, with enlarged terminal 

 bulbs containing corpuscles. 



Family POLYSTYELIDiE Herdman, 1886. (Polyzoidse Michaelsen, 1900.) 



Colony variable in form, but always without systems, the atrial as 

 well as the branchial aperture of each zooid opening independently 

 on its surface. Test penetrated by branching vessels with enlarged 

 terminal bulbs. 



Zooids with both apertures four-lobed, if lobes are developed. 

 Branchial sac with many rows of stigmata, with internal longitudi- 

 nal bars, and often with folds. Dorsal lamina a plain membrane. 



Alimentary loop usually lying alongside the branchial sac. 

 Stomach-wall longitudinally folded. 



Reproductive organs in the form of polycai'ps containing either 

 testes or ovaries, or both, attached to the inner wall of the mantle in 

 the peribranchial cavity. They are developed on both sides of the 

 body. 



