No. ^9.] 



ECHINODERMS OF CONNECTICUT. 



131 



of eelgrass. Grave has reared the larvae to the adult form, and 

 has succeeded in keeping the young holothurians to the age of 

 two or three years by the methods described on page 128. 



Color white or pale yellowish. Size usually about i inch long 

 and a half-inch in diameter; rarely reaching a length of 2 inches. 



In such specimens as are washed up by the waves the body 

 is oval, sometimes tapering towards one end; with a distinct 

 curve, the two ends being bent dorsally, with the result that the 

 length of the body measured along the ventral surface is much 

 greater than if measured along the dorsal surface. 



There are ten much branched tentacles, of which the two 

 ventral are much smaller than the others, as in Thyone. In the 

 specimens found on the beach they are usually fully retracted 

 into the body, as shown in Plate XXXII, figs. 2 to 6. 



The tube-feet, or pedicels, are rather stout, and are strictly 

 limited to the five ambulacral regions, or radii (Fig. 22). 



The cloacal opening is surrounded by five small groups of 

 pedicels which are stiffened with thickly placed calcareous 

 deposits (Fig. 23). Imbedded in the body walls in all parts of 



Fig. 23. Cucumaria pulcherrima. Outlines of calcareous plates. The 

 upper left-hand plate is from a tentacle; the three lower left-hand plates 

 are from fSie pedicels ; all the others are from the body wall. ( X 300.) 



