247 . 



III. Geographical Distribution. 



In my work "lYw iMliiuodennen-Larven d. Plankton-Exped." p. 108— 

 111 tlu' distiihulioii of the l^cliiiiodenn larv.T and soiiic of the probU'ins 

 (•oiinecli'd llnMowilh were discussod at sonu' k'ii<*lli. Since then only very 

 little additional infoinialion on lliis subject has been obtained. MacBride 

 in 190,'! published a ■Report on a small collection of Echinoderm larvae 

 iiKide l)y j\lr. (ieorge Murray during tlu' (juise of the ■Qceana'" in Novem- 

 ber 1898" 1); only one species, the larva of Luidin Sarsi, is recorded there, 

 from the Atlantic olT S. W. Ireland (52M' N., 12 27' W.). C.emmill^) has 

 recorded some larva- of Liiidia ciliaris likewise from oil' S. W. Ireland 

 (30 — 60 miles off Tearaghl Island), and one single specimen of "Brachio- 

 Idiid hibcriiicd" from 50 Miles X. by W. of Kagle Island, \V. of Ireland. In 

 my report on "Die hxhinodermen-Larven d. deutschen Siidpolar-Expedi- 

 lion" (p. 109) a Spatangoid-larva is recorded from 10^^17' E. 28"45' S., that 

 is about in the mid-Atlantic between Cape and Patagonia, at a depth of 

 nearly 5000 Meters. Apart from this highly interesting find only larva' 

 taken near the littoral regions are recorded in that work, as also in Mac- 

 Bride's reports on Echinoderm larvae from the Antarctic Expeditions 

 (National Antarctic Exped. ; British Antarctic ('Terra Nova") Exped.). The 

 existence of quite a considerable number of pelagic Echinoderm larva* in 

 the Antarctic Seas has been established herewith: but this fact, though of 

 very considerable interest, does not concern us here. Referring still to the 

 "Stellospluera mirabHis" recorded by Koehler & Vaney from the vicinity 

 of the Azores (ca. 3() — 10 N. 19 — 30" W.) mention has been made of, so 

 far as 1 know, all records giving observations on the occurrence of Echino- 

 derm larvae in the open Ocean. =*) 



.\s stated in the Introduction (p. 10) 1 have at various occasions made 

 eflorts to bring together some more facts relating to the problem of the 

 distribution of Echinoderm larva? over the open Ocean. Observations made 

 during the passage over the Indian Ocean from Aden to Singapore gave 

 the result that, while luhinoderm larvae were found in good numbers in 

 the Gulf of Aden, none were observed until near the Maldives, but from 

 there larva* occurred the whole way across the Bay of Bengal. This would 

 appear to indicate that larva* do not occur in the great Arabian Sea. 1 

 would, however, not regard the negative result as conclusive, because the 

 samples were taken there at day time. Later on samples were taken also 

 by night, and these were invariably richer than those taken l)y day. in 



') .Ann. & Mag. Nat. Hist. VII. Ser. XI. p. 477— 78. 



') .1. V. Gi-minill. On a new brachiak- Asteroid larva and on the advaiiocd Ripimiaria 

 of Luidia ciliaris (I'hilippi) Gray. Proc. R. Phys. Soc. I'.dird). XIX. 101.''). 



") Soo, li()\vc\ cr. (he paper hy SInnlcv (iardincr nicnlioiu'd holow (p. 2.">ll. 



