1910.] AND XUDIBRANCHS OF BERMUDA. 145 



Under a low power lens one can see the long cilia in motion. 

 The animal assumes a variety of positions while in this resting 

 state, and it frequently rests on its back. The foot may be fully 

 expanded or much contracted. When the animal was placed in a 

 weak solution of methylene-blue in sea-water, the cup-like folds 

 on the rhinophores appeared as swellings, and after a few hours 

 the lateral papillae and rhinophores were sloughed off. 



The eggs are laid in a cylindrical mass of jelly. The number 

 varies from one hundred to three hundred in each mass. Each 

 animal lays several egg-masses. 



The animals are very hardy, living in confinement for over six 

 weeks. 



A paper on the anatomy of this species is well under way and 

 will be published separately. 



Bibliography. 



CoNGDON, E, D. 



(07.) The Hydroids of Bermuda. Proc. Amer. Acad. Arts 

 and Sci. vol. xlii. no. 18, pp. 461-485. Contributions 

 Bermuda Biol. Sta., No. 9. 



Bergh, R. 



(92.) System der Nuclibranchiaten Gasteropoden. In Karl 

 Semper's Reisen im Archipel der Philippinen, Theil ii. 

 Bd. ii. Heft 18, pp. 993-1165. 

 Also separately, Wiesbaden : Kreidel, 173 pp. 



Heilprin, A. 



(89.) The Bermuda Islands. Philadelphia, [vi] + 231 pp., 

 17 pis. 



Reichert, K. B. 



(70.) Yergleichende anatomische Untersuchungen iiber Zoo- 

 botryon pellucidus (Ehrenberg). Abhandl. phys. Kl. 

 konigl. Akad. Wissensch. Berlin, Jahrg. 1869, pp. 233- 

 338, 6 Taf. 



Verrill, A. E. 



(80.) Notice of recent Additions to the Marine Invertebrata of 

 the North-eastern Coast of America, with Descriptions 

 of new Genera and Species and Critical Remarks on 

 others. Part II. Proc. U.S. Nat. Mus., vol. iii. pp. 356- 

 405, Dec. 1880. 



(82.) Catalogue of Marine Mollusca added to the Fauna of the 

 New England Region during the past Ten Years. Trans. 

 Conn. Acad. Sci., vol. v. pt. 2, pp. 447-587, pis. 42-44, 

 57, 58. 



Proc. Zool. Soc— 1910, No, X. 10 



