55 



trace of a posterior transverse rod was seen; I he dorsal arch had been 

 formed. The postero-dorsal rods are fenestrated as the postoral ones. 



In the second culture many of Ihe larva- were more or less abnormal, 

 the body skeleton forming a more or less developed mesh work. 



Mespilia globulus (Linn.). 



PI. VII, Figs. 12. 

 Th. Mortensen. On the development of some Japanese Kchinoderms. p. 5-Jli. 



Although this species 1 ) is fairly common in shallow water near the 

 Biological Station at Misaki, it was quite difficult to get a culture of it, 

 partly because its breeding season appears to be somewhat later in the 

 summer, partly because it was found to be very generally infested with 

 a Trematod living in its genital organs and destroying these more or less 

 completely. I succeeded, however, in gelling a fertili/.ation of it on June 

 25th 1914, which 

 gave a small, but 

 sufficient number of 

 larva?. They devel- 

 oped quite normally 

 until beginning me- 

 tamorphosis, when 

 the surviving spec- 

 imens had to be pre- 

 served on my depart 

 from the station. 



The developmen- 

 tal processes do nol ^ ^ Skcleton of , arva ()f _ WM/J .,, U (//oft((/us . ls( stagc 



go OI1 SO fast as in A. front view: B. side view. 100 /i. In fig. B. the postoral rod 

 TeninonlciU'llS loreil- is abnormally widened into a lenestrated plate; also in fig. A 



there is a slight abnormity at the base of the right postoral 



maticus; the embry- ,. 0(1 . Letters as in fig. 5. 



os had not yet pas- 

 sed the blastula stage at the age of ca. 24 hours. The young Pluteus 

 does nol afford any very marked features; the body is nol quite so 

 elongate as in I he two other Temnopleurid-larvse described above, and 

 the stomach is nol quite so small as in these. Pigmentation is very scarce. 



') Yoshiwara (Preliminary Notice of new Japanese Hchinoids. Annot. Zool. Japonenses. 

 II. 189.X. p. .'),S) has established the species M. Iri'itiibrrciilala for the Japanese form of Mespilia. 

 H. L. Clark (Hawaiian and other Pacilic Kchini. The Pedinida- .... Kdiinid;e. Tcmno- 

 pleuridic .... Mem. Mus. Comp. Xool. XXXIV. No. I. liM'J. p. '.\'2'2) maintains (hat it cannot 

 be separated from the typical .17. f/lobulux (I..). On adopting the name M. (jlolniliix for it 

 here I must state that it is on the authority of II. L. Clark, having not yet had the opport- 

 unity of critically examining the question myself. 



