382 W. G. Van Name — Bermuda Ascidians. 



this intermediate vessel from one large vessel to the next. In other 

 places the stigmata are interrupted by the intermediate vessel. 



The stomach is long and narrow, deep yellow or brown in color, 

 with many longitudinal folds and a small coecum on the side toward 

 the intestine. There are a considerable number of short atrial ten- 

 tacles. 



There are a number of polycarps arranged along each side of the 

 ventral part of the body. They are hermaphrodite, containing two 

 large pyriform or oval testes and a number of ova. Often, as sections 

 of the colonies clearly show, they lie in small papillae or knob-like 

 evaginations of the body-wall which are thus more or less nearly 

 surrounded by the test, and may communicate with the body only 

 by a somewhat constricted neck. It is probably on account of 

 these, as well as because of the large and strong vascular processes 

 arising from the posterior ventral part of the body, that it is very 

 difficult to remove the zooids from the test entire. 



Specimens of this species preserved in formalin retain their natural 

 color for a considerable time. In its character and appearance a 

 colony closely resembles a flattened example of some of the simple 

 ascidians of the family Cynthiidse, with which it is found associated, 

 though the numerous apertures serve to distinguish it. The colony 

 looks more like an aggregation of small simple ascidians than a com- 

 pound ascidian. 



This species is found on the under side of stones near low water 

 mark, nowhere in great abundance, but widely distributed, and it 

 was collected in 1901 at nearly all the points about the islands where 

 much collecting was done. 



Diandrocarpa, n. gen. 



Colony incrusting. Apertures elliptical, without lobes. Tenta- 

 cles few. 



Branchial sac simple ; no folds and few internal longitudinal bars. 

 No small intermediate transverse vessels. 



Loop of alimentary canal large, placed beside the branchial sac. 



Reproductive organs consist of a single mass on each side of the 

 body, each with two large pyriform or lobed testes and a group of 

 eggs. 



I form this genus for the species described below, which differs 

 too much from the type of Gynandrocarpo. Michaelsen to be placed 

 in the same genus with it. (The type of Michaelsen's genus is 



