53 



The dorsal arch has not yet been formed, and there is as yet no trace either 

 ol' ;i posterior transverse rod. That this latter rod will prove to exist 

 may be su|)posed i'rom its existence in the two related forms described 

 l)elow, and especially in the larva fron> the (iulf of Siam, which probably 

 belongs to T. toreunuitkiis. 



At the age of 12 days the larva had not developed beyond this stage, 

 and as I had then to leave Misaki, there was no possibility of studying 

 its further development. 1 

 tried to carry the culture 

 along with me; but while 

 I succeeded in carrying 

 some othercultures in good 

 condition to Australia, this 

 one succumbed. 



In a plankton sample 

 from the Gulf of Siam (oil 

 Koh Kam. 1. 11. lUUO) 1 

 have found an Echinoid 

 larva which is so very 

 similar to the larva of 



TemnopL lureuimdicus^) 

 that it seems almost just- 

 ified to refer it to this 

 species. This larva is only 



in a slightly more ad- l^ig. le. skeleton of larva of Tcmrwplmnis iDrciinmtuus. 

 vanced sla«'e than the " "^ay^ "l^- '°°/i- Letters as in llg. :>. citr. dorsal trans- 

 '^ verse rod. 



oldest stage of the /'. lo- 



reumaticus larva reared. Vibratile epaulets are beginning to develop. 

 A posterior transverse rod has appeared and also the dorsal arch; on 

 the other hand the body rods have apparently not yet begun to be ab- 

 sorbed. Posterolateral processes arc indicated, which will be supported 

 by the branches of the transverse rod; that this rod has branches at its 

 ends can be seen, but their definite form is not yet to be ascertained. 



M The fact llial this larva was taken In the begimiitin of February, while the IVrlilizalioiis 

 were undertaken in the end of.lune, does not render the reference of the larva to this species 

 impossible, since some specimens taken olV l\oh Rons in the Ciidf of Siam on the 2.5th of 

 .January liKid jirove to contain ri|)e sexual products. Whether this species has then a breeding 

 season so long as indicated by these dates, or its breeding season is perhaps not so early in 

 Japan as farther South, remains to be ascertained. 



