ECHIXODERM LARVjE. 



a point of importance, since it gives p<isitive evidence of the existence of these 

 structures umong the Cucumariidfe, a fact which has been asserted, but never 

 conclusively proven. 



Zoological Laboratory, McGill University, April 1st, l'.)()7. 



LIST OF PAPERS QUOTED. 



1. Bkll, i\ J. — " Ecbinuderms " in lleport on the collections of the 'Southern Cross,' London, 11102, 



p. 21-t. 



2. Bury, If. — "Studies in the Embryology of the Echinoderms." Q.J. Micros. Sci., vol. 2'.) (1889), 



pp. 409-4i9. 



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



Memoirs Soc. Nat. Hist., 5 (1898), pp. r(;!~88, 5 pis. 



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



from the Franklin Islands," Ann. Mag. Nat. Hist., vol. IG (19U."i). 



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



1 Buch. (1889-92). 



6. LuDWiG. — " Zur Eutwittkluugsgeschichte der Holothurieu." Sitzungsber. Preuss. Akad. d. Wiss. 



Berlin, 1891, p. 003. 



7. MacBride, E. AV.—" Development of Asterinu gibbosa." Q.J. Micros. Sci., vol. 88 (189G), 



pp. 339-111. 



8. MacBride, E W. — "The Development of Echiuoids," pt. 1. "The larva; of Echinus miliaris and 



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



9. MoRTENSEN, Th. — " Die Echinodermenlarven dcr Plankton-Expedition d. Humboldt-Stiftung." 



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

 10. THOiisON, C. WyviIjLE. — " The Voyage of the Challenger — the Atlantic," London, 1877. 



TABLE OF PLATES. 



Fig. 1. Asterias braiulli, Bell, x 12i. Youngest emliryo of brood. 



Fig. 2. Ophinpluteus sp. n. ? x Kio. 



Fig. 3. Echinoplutous antarctkus sp. n. x 100. 



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



Fig. a. Cucumaria 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. G. CiKumarta crocea Lesson, x 12i. Young embryo, born after capture of the mother, which is 



shown in figs. 1 and .5.' 

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



fiK. 6. 



