W. G. Van Name — Bermuda Ascidians. 401 



figiare, do not Ji])pear to be frequent. The papillje are rather stout, 

 of moderate length and somewhat curved. Their ends are obtuse. 

 Those opposite the smaller transverse vessels are smaller. These 

 small transverse vessels are occasionally interrupted and rudimentary 

 though the corresponding papillae may be present and well developed. 



In most parts of the sac there is little or no sign of the undulation 

 or plication common in this genus, the sac being almost flat, but 

 individuals vary in this respect. On the whole the branchial sac is 

 of a simple type. Horizontal membranes are developed only on each 

 side of the dorsal lamina and to a very slight degree on the adjacent 

 parts of the sac. Elsewhere they are inconspicuous or wanting. 

 The dorsal lamina is often nearly plain-edged for most of its length. 

 In other cases it is finely denticulated in the posterior portion of the 

 bod}^ 



The stomach and intestine are proportionately small and form a 

 very compact and short loop. The stomach has a few longitudinal 

 folds and during life is of an orange color. This color may also 

 extend to part of the intestinal loop. 



The reproductive organs lie between the stomach and intestine 

 and the branchial sac. The duct follows the rectum and ends near 

 the anal opening. 



This species was found at Coney Island, Long Bird Island, in 

 Harrington Sound, at Somerset Island, and many other places, 

 attached to stones, shells, etc. It is one of the commonest simple 

 ascidians at Bermuda. Traustedt's specimen (he appears to have 

 had but one) was from St. Thomas, W. I. 



LITERATURE. 



1. Baxcroft, F. W. — Ovogenesis in DistapUa occidentalis Ritter (MS.), with 



remarks on other species. Bull. Miis. Comp. Zoology at Harvard College. 

 vol. XXXV, No. 4. 



2. Delage, Y. and H^rguard, E. — Traite de Zoologie Concrete, vol. viii, Les 



Protochordes. Paris, 1898. 



3. VON Drasche, R. — Die Sj'uascidien der Bucht von Rovigno (Istrien). Wien, 



1883. 



4. Heller, C. — Untersuch. liber die Tunicaten des Adriatischen und Mittel- 



meeres. Denkscbr. d. k. Akad. d. Wiss. Wien, vol. xxxiv, pp. 1 and 

 107, vol. xxxvii, p. 241. 



5. Heller, C. — Beitrage ziir nabern Kenntniss der Tunicaten. Sitz. Ber. d. 



Akad. d. Wiss. (Math, naturw.), vol. Ixxvi, p. 83, Wien, 1878. 



Trans. Conn. Acad., Vol. XI. 26 February, 1902. 



