ACTINOPOBOrs HOLOTlirrJOIDEA . 



181 



nunu'rous pedicels arc in tlirce distinct zones, the middle zone 

 being, in the large specimens twice as Ijroad, and in the small 

 specimen abont as broad, as tin- lateral zone. 



In one of the large specimens : Polian vesicle one, pear- 

 shai)ed, several cm. long, and situated on the left ventral inter- 

 radius of the circular canal. In the small sjjecimen, Polian 

 vesicles arc four in number, two being large and two small. 

 Stone-canal one, attached to the mesentery, much meandering. 

 The madreporic body in the usual position in the opening of 

 the mesentery opposite the middorsal interradialia of the 

 calcareous ring. Calcareous ring ol)li(j[ue, being highest and 

 stoutest in the middorsal line and gradually narrowing toward the 

 midventral line (texttlg. o2a). Eadialia four-pointed, interradialia 

 one-pointed. The notch on the posterior edge of radialia is 

 shallowest in the midventral one and gradually becomes deeper 

 in the more dorsal ones, owing to the more pronounced posterior 

 prolongations of these latter. 



Calcareous deposits :—( i ) Slender tables of only one kind, 



about 0.03G mm. high, with 

 disk measuring about as 

 much in diameter (/^ r). 

 The lattei' has mostly 

 four central holes and four 

 intcrradial corner holes, 

 or at the most only a 

 periiiheral eircle of small 

 Textrig. 32. holes. Spire with one 



m.-hop„s vnrie:,atus: n~0.\a<..o».nu(,; ,,c~---i:,M..- t,..ii,y,.crse. beam, cudiug 



vpiilpil iriliTnulinliit ; Jr<l— Uiglil iloisiil iiitumulLiliji ; llmv in (wc'Ivc or morC tectll 

 — Jliilvr ilnil nulinlifi ; lUil- 15i(;lit ilutsjil iiuliiiliii ; l!il 



uiKht iii.nii nuiu.im. which ha\t a tendency 



J?1I1V, 



