248 



conformity with Ihc well known fact that most pclat^ic animals avoid 

 the strong dayli^iit by goiiii> down in llie sea, raising again to the 

 surface at night lime. 1 would exjject that samples tal<en by niglil will 

 prove larvte to occur also all over the Arabian Sea. But that remains to 

 be proved. 



Besides llu- niaU'rial of |)Iankton samples collected lor me on various 

 cruises across tiie .\tlantic by Messrs. Blegvad.Kramp and Fogh (comp. 

 p. 10) I have also had liie opportunity of examining some other samples like- 

 wise taken on the way to and from the West Indies, kindly placed at my dis- 

 posal by Dr. .lohs. Schmidt. The samples were all taken at the surface 

 by night time. The following larv.ne were obtained lioiu these samples. 



Spharechinits (jranularis . . . 36°13' N. .S.S°.")0' W. l.")'Il 1 Mil 1 Blegvad OfT .Xzorcs 



— — ... .■i6°42' - H0".'?6' - 16/111 - ~ 

 Echinoptuicus Iransversiis . . ;i2°l()' - 17^20' - .'JO/X Htll Kramp - .Madeira 



.. 27°10' - 21 ".VV - :5/XI — — - Canaries 



— -- . . 3r22' - 14°.")7' - 16 \ I!il2 Fogh - Madeira 



.. 28°43' - 20-40' - 22 .\ - Canaries 



Echiiwpluli-its sp 2.'>°40' - 24°10' - 24 X 



— 18°4,")' - 62°20' - 19X111)11 Kranip Virgin Isl. 



Liiidia ciliaris ;56°13' - 33=50' - 15/111 — (1 )r, Sc li mid I) - .\zoros 



— — 37°31' - 35°34' - 12/V — - — 



— Sarsi(^)^) 30°.30' - 49°57' - 22/11 — -- Sargasso Sea 



Bipinnaria sp 40°47' - 2110' - 21/III Blegvad Off Azores 



— .32°22' - 22°49' - 26/111 — 



_ 20°46' - 11°16' - ll/XllDll Kramp Sargasso Sea 



— 19°36' - 47°13' - 13/XI — — — 



— 23°15' - 58°43' - 16/11 1912 — — 



25°16' - 55°37' - 20/11 — 



— 24°33' - 60=12' - 18/11 1913 Fogh 



Auricularia niidihranchiata . 30°30' - 49°57' - 22/11 191 1 (Or.Schmidt) 



_ _ . 33°5o' - 43''40' - 12/111 — 



_ _ . 34^39' - 40''54' - 13/111 — 



— — . .36°1.3' - ,33°50' - 15 111 



— — . 39°22' - 22°49' - 20 111 OIT .\zores 

 _ _ . 40°47' - 21 = 10' - 21 111 — 



_ _ . 45°,32' - 25=50' - 24/VI — 



The result is seen to be in fair accordance with that previously obtained 

 from the study of the material collected by the Plankton-Expedition, viz. 

 that, while in general the Echinoderm larva? occur more numerously in the 

 coastal waters, several specimens may be found also in mid-Ocean. This 

 raises the interesting problem: how did they come there? Were Ihey carried 

 out from the coastal waters by the currents, or did they rise from the 

 bottom? 



So long as we do not know the parental origin of the larvre found in the 

 open sea the question cannot be answered definitely. Most probably they 



■) Identifualion of tlie single specimen a little uiuertain on account of tlie very poor 

 preservalion. 



