ECMiXODEKM LAKV.H. 



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

 structures among the Cucunmm.Uu, a fact which has been asserted, hut never 

 conclusively proven. 



Zoological Laboratory, MeGill University, April 1st, I!>o7. 



LIST OF PAPERS QUOTED. 



1. DELI..^ J.--" E rhinoderms " in K,port on the collections of the ' Southern Cross," London, 1902, 



2. IJniY, II.-" Studies in the Embryology of the ly:hinodmns." Q.J. Micros. Sri V ol 29 fi 8 891 



It- 09-44'J. 



3. CI.AKK, II. L-Synapta vivipara : a contribution to the morphology of Erhiuodermata," Boston 



Memoirs Soc. Nat. Hist., 5 (mis), pp. ;,;;_*, 5 p l s . 



4. HKXI.ERSON E. H --"Some observations on the development of an Asterid with large yolky eg** 



from the Franklin Islands," Ann. Ma- Xat. Hist, vol. 10 (I'll,;,) 



s, > M., * Abth., 



6. Lu.-"Zur Entwicklnngsgeschichte dcr Holothurien." Sitzuugsber. JVenss. Akad. d. \Viss. 

 Jt>erliD, 1^91^ p. do;j. 



-m W -" Devel P ment of Astt ' rina t'il'bosa." Q.J. Micros. St-i., vol. 38 (1896), 



- 



8. MAC_BHI,, E E W- -The Development of Echinoids," pt. l. -The larva, of Echinus miliuris and 



E. esculentus." Q.J. Micros. Sci., vol. 4i> (1801)), pp. 835-S8M 



9. MOETENSE-N, Tii " Die Echinodermenlarven der Plankton-Expedition d. Ilnmboldt-Stiftung " 



iW. II. J., Kiel and Leipzig, 18'J8. 

 10. THOMSON, C. WYVILLK.-" The Voyage of the Challenger-the Atlantic," London, 1x77. 



TABLE OF PLATES. 



FIG. 1. Astern bramHi liell. x U>i. Youngest einl^ryo of brood. 



ilG. 2. Oplnuplufrtis sp. n. ? x 100. 



FIG. 3. Eehmopluteus mitim-tii-iia sp. n. x 100. 



' 'M crocea Lesson, x 1. Adult female, showing openings of the two brood-pouches. 



MTb MiM Lesson. < 1. Another view of the same specimen, with the body-wait cut 

 thiough so as to expose the interior of the brood-pouches 



Fl %L n l:t:r; ;:;;" Lcsso "' x 15 '- YM emb ^ *- "- * <"< *-. -^b 



F ''i I""""""" '""" LeSSO ' T 'e < through the a,,tc.,i,,r region of eml.rjo Ao.vn in 



