W. G. Van Name — Bermuda Ascidians. 327 



consequently uncertain in regard to the genus and even of the 

 family in which it should be placed. Considering the difficulty of 

 recognizing most species of Compound Ascidians even when an 

 abundance of well preserved material is at hand, the practice of 

 describing new species from such wretched specimens need not be 

 commented on. The writer does not believe that the animal in 

 question is a Didemnum. It may or may not be identical with one 

 of the forms described in this paper, but the description does not 

 warrant devoting time and space to conjectures concerning it. 



The following are the additions to this list made in Prof. Verrill's 

 paper (IV) above alluded to: 



Styela partita (Stimpson). Microcosmus miniatus. 



Styel" canopoides Heller. Polycarpa multiphiala. 



Halocynthia rubrilabia. Diazona picta. 

 Halocynthia riiseana (Traustedt). 



Of these, four were new species. All save the last named are 

 Simple Ascidians. Prof. Verrill also mentions the occurrence of the 

 following genera, Leptoclinum, Distaplia, Uistoma and Amarou- 

 cium, though naming no species. 



One of these, Styela canopoides Heller, is, I think, included on 

 insufficient evidence, while the Bermuda representatives of two of 

 the others, Styela partita (Stimpson) and Halocynthia riiseana 

 (Traustedt) differ sufficiently from the types to be considered as new 

 subspecies. 



Omitting Styela canopoides and the doubtful Didemnum inerme, 

 there remain a total of eleven species recorded from the islands. Of 

 these six are Simple and five Compound Ascidians, according to the 

 classification I have adopted in this paper, in which the Clavelinida 1 

 and Perophoridae are regarded as Compound Ascidians. Only one 

 of these, Symplegma (unfortunately the most interesting of them), is 

 wanting from the Yale collections. 



This is no inconsiderable number if the small geographical area 

 under consideration is taken into account, yet a study of the collec- 

 tions made in 1898 and 1901 enables me to increase it to no less than 

 38 species, one of which is represented by at least six well-marked 

 varieties and another by three, in addition to the type. As these 

 varieties differ sufficiently to constitute species if intermediate forms 

 did not occur, we have 46 as the total number of kinds of tunicates 

 known to occur at Bermuda. They are distributed as follows in 23 

 genera (4 new) and 9 families. 



