ECHINODERM LARVJ5. 9 



a point of importance, since it gives positive evidence of the existence of these 

 structures among the Cucumariidse, a fact which has been asserted, but never 

 conclusively proven. 



Zoological Laboratory, McGill University, April 1st, 1907. 



LIST OF PAPERS QUOTED. 



1. Bell, F. J. — " Echinoderms " in Report on the collections of the 'Southern Cross,' London, 1902, 



p. 214. 



2. BuEY, H.— "Studies in the Embryology of the Echinoderms." Q.J. Micros. Sci., vol. 29 (1889), 



pp. 409-449. 



3. Claek, H. L. — " Synapta vivipara : a contribution to the morphology of Echinodermata," Boston, 



Memoirs Soc. Nat. Hist., 5 (1898), pp. 53-88, 5 pis. 



4. Henderson, E. H. — " Some observations on the development of an Asterid with large yolky eggs 



from the Frankhn Islands," Ann. Mag. Nat. Hist., vol. 16 (1905). 



5. LuDwiG, H. — " Die Seewalzen " in Bronn's Klassen u. Ordnungen d. Thier-Reichs, 2 Bd., 3 Abth., 



1 Buch. (1889-92). 



6. LuDWiG. — " Zur Entwicklungsgeschichte der Holothurien." Sitzungsber. Preuss. Akad. d. Wiss. 



Berlin, 1891, p. 603. 



7. MacBeibe, B. W.—" Development of Asterina gibbosa." Q.J. Micros. Sci., vol. 38 (1896), 



pp. 339-411. 



8. MacBeide, E W. — " The Development of Echinoids," pt. 1. " The larvse of Echinus miliaris and 



E. esculentus." Q.J. Micros. Sci., vol. 42 (1899), pp. 335-339. 



9. MoETENSBN, Th. — "Die Echinodermenlarven der Plankton-Expedition d. Humboldt-Stiftung." 



Bd. IL J., Kiel and Leipzig, 1898. 

 10. Thomson, C. Wyville. — " The Voyage of the Challenger — the Atlantic," London, 1877. 



TABLE OF PLATES. 



Fig. 1. Aster ias Irandti Bell, x 12 J. Youngest embryo of brood. 



Fig. 2. Ophiopluteus sp. n. ? x 100. 



Fig. 3. EcMnopluteus antarcticua sp. n. x 100. 



Fig. 4. Gucumaria crocea Lesson, x 1. Adult female, showing openings of the two brood-pouches. 



Fig. 5. Gucumaria crocea Lesson, x 1. Another view of the same specimen, with the body- wall cut 



through so as to expose the interior of the brood-pouches. 

 Fig. 6. Gucumaria crocea Lesson, x 12|. Young embryo, born after capture of the mother, which is 



shown in figs. 4 and 5. 

 Fig. 7. Gucumaria crocea Lesson. Transverse section through the anterior region of embryo shown in 



fig. 6. 



