JOUEXAL 



OP IHS 



PiOTAL MICROSCOPICAL SuCIETY, 



.JT3E IS Si 



TEAySACTIO^'S OF THE SOCIETY. 



VII. — Xoie on the Spicules found in the Amhulacral Tul-is cffne 



regular Echinoidea. By Profe^or F. .JzryszT Bzix. M.A., 



F.E.M.S. 



(Read lOfA Jfay, 1882.) 



I HAVE thonght ttat it might te of interest to tlie Society to hare 

 some fartlier information on the distzibntion of the spicnles foimd 

 in tlie ambulacra! tubes c: :1t :fi".:'?.r EohiniEdesL The greater 

 part of our present tnc—^ei^-e ci. rlis subject "sre owe to the 

 researclies of one of our Secretaries. Mr. Cbarles Stewart, tiie 

 most important of whose papers was r-C-isiif-i in the TjTmipan 

 Society's ■'Transactions' for 1S65.* I z:-.-i liru ^^bled to 

 examine a large series of genf.?. :\r.i: s-T.if;, /.:i_". ?.5 ii~ 'fiiins: 

 object has been to find some riirlrr :L:.:a::t:5 ""1::'_ -:ili ce oi 

 assistance in the classiJication of the r-:ir5 ^i.i ^fuera of tlie 

 order, I hare confine! my attention a: pre^fi.: :•:. i^e sucking- 

 tubes. 



Commencing with the genus E:'hin\LS, I was struck bv the 

 constant presenc-e in its spieoies of these C-s} 





spicules, the characters of which will ce known :■;■ every mic-risoo- 

 pist (PL Y. Fig. 1). Carrying on these researches further, I 



ZXPLAyATIOX OF FLATZ T. 



F16. 1. — EchiAvs (E. mcargarifaceiis), to show the (adinaiy lahainate 



„ 2. — Coiialdia (C. joriesamii). 



„ 3. — EcMnocidaris (E. dvfresna). 



„ 4. — EcMiiothrix QE. tvareanan). 



y, 5. — Diadema (J), setosimy. 



„ 6. — Mkropgga iaberemlata. 



„ 7. — AsOtemoaomta p^neidvm. 



y, S. — Pkarmasoma btBrsariiam, 



„ 9. — Salemia tasUgera. 



* Yol. xxT. p. 365. 



Scr. 2. — Vol. II. ^^ 



