XVII. — Additions to the Tltnicata and Molluscoidea of the 

 Bermudas. By A. E. Verrill. 



Most of the published information concerning the Bermudian 

 Tunicata is by Herdman in the Reports on the Zoology of the 

 Challenger Exp,, vol. vi. 18S2 ; vol. xiv, 1886 ; and vol xxvii, p. 141. 

 In these volumes several ascidians are described from Bermuda, viz: 



Symplegma viride, vol. xiv, p. 144, pi. xviii, figs. 7-14. 

 Didemnum inerme, vol. xiv, p. 265, pi. xxxiv, figs. 6, 7. 

 Botrylloides nigrum, vol. xiv, p. 50, pi. ii, fig. 8 ; iii, figs. 19-21. 

 Ecteinascidia turhinata, vol, vi, p. 243, pi. xxxvi, figs. 1-6. 

 Clavellina ohlonga, vol, vi, p, 246, pi. xxxv, figs. 6-10. 

 Ascidia nigra (Savig.) = A. atra (Les., 1817), vol. vi, p, 210, 



All these species and many more were obtained by our party in 

 1898. The total number collected is about 25 species. These have, 

 as yet, been but partially studied. 



Among the additional genera are the following : Diazona {D. 



picta, sp. nov,) ; Botryllns ; Leptoclinum, several species; Dis- 



talium, a new species forming pyriform colonies of a bluish gray or 



smoky brown tint when in formalin; Distoma ; Amoroecium; 



Styela, and others. 



The most interesting species is that which I have named Diazona 

 picta. It forms large compound clusters, usually attached to gor- 

 gonians, and often 6 inches or more in breadth and height. Each 

 zooid has the oral aperture surrounded by a carmine-red band and a 

 stripe of the same color runs down one side, while the ground-color is 

 translucent bluish or pinkish white, giving to the whole cluster an 

 elegant appearance when living. 



Additional Species. 



Styela partita (Stimp.) Ver. 



Cynthia partita Stimp., Proc. Boston Soc. Nat. Hist., iv, p. 231, 1852. Verrill, 

 Amer. Jour. Sci., iii, p. 213, 1872. Eep. Invert. Anim. Vineyard Sd., p. 

 407 [701], pi. xxxiii, fig. 246, 1874. 

 Halocynthia partita Verrill, Proc. U. S. Nat. Mus. for 1879, p. 197. 



Distinguished externally by the alternating stripes of red and white 

 in the apertures. 



Common on the under side of stones and dead corals and in crev- 

 ices of the reefs. Mass, Bay to Florida and West Indies, 



