. Echinoderms of Connecticut . FIG. 13. Arbacia punctulata. Out- line of plates of aboral surface, showing the four plates of the peri- proct, surrounded by the five ocular and five genital plates at the ends of the ambulacral (R} and inter- ambulacral (/) zones, respectively; the genital plate marked M is the madre- poric plate; T, tubercles for attach- ment of spines; P, pores for the tube- feet. At the margin of the peristome are five pairs of much branched processes, having a respiratory function, and termed the dermal branchiae, or gills. Just inside the test at the border of the peristom
. Echinoderms of Connecticut . FIG. 13. Arbacia punctulata. Out- line of plates of aboral surface, showing the four plates of the peri- proct, surrounded by the five ocular and five genital plates at the ends of the ambulacral (R} and inter- ambulacral (/) zones, respectively; the genital plate marked M is the madre- poric plate; T, tubercles for attach- ment of spines; P, pores for the tube- feet. At the margin of the peristome are five pairs of much branched processes, having a respiratory function, and termed the dermal branchiae, or gills. Just inside the test at the border of the peristome, and resting upon the bases of the ambulacral areas, are five pairs of calcareous
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherhartf, bookyear1912
