On the Development of Cucumaria 
echinata v. Marenzeller. 
By 
Hiroshi Ohshima. 
With Plates 8 and 9 and 11 Text-tigures, 
CONTENTS. 
PAGE 
1. INTRODUCTORY REMARKS : : ‘ ‘ : Saeeligies 
2. Previous StupIES ON ALLIED Forms. : é 2 Pi 
3. METHODS OF INVESTIGATION . ; : : . E aekio 
4, BREEDING SEASON , ‘ ; ‘ ‘ ; 3 a Alb 
5. GENITAL ORGANS . ‘ ; F : . : : Fe alts 
6. SPAWNING . , 5 ; P : a ; : . 186 
7. NEWLY-SHED Eaas : ‘ ‘ ; : : d . 188 
8. CLEAVAGE . ’ ; , : ; : ; : . 190 
9. BuastuLa . : : 3 - : é : : er l92 
10. GastTRULA . P ; : F 2 : é ; . 195 
11. DreLeuRvLa ‘ ; ; : : ‘ P ; . L199 
12, DoLIoLaRIA ; ‘ ‘ : d : d ‘ 5 ADE 
13. METADOLIOLARIA p f ; F ; : : 2 28 
14, PENTACTULA ‘ , ; : : : : ; ae rN 
15. Younae , 5 ; f ; A ‘ : ; 5 7224 
16. SUMMARY . ; ‘ : F é é : ‘ Seni 
17. BIBLIOGRAPHY . é ; : : , : : =, wt) 
1. InrRopucToRY REMARKS. 
Tue following passages, which are to be found in the diary of 
the Marine Biological Station of Misaki, concern the spawning of 
Cucumaria echinata, and are written chiefly by the late 
Professor Dr. Kakichi Mitsukuri. 
