258 



ZOOLOGY 



Several species of Holothurians occur on the Maine coast. A 

 barrel-shaped form with a sort of tail (Caudina/ Fig. 2.50) occurs on 



the Massachusetts coast. A 

 worm-like form, but with a 

 beautifuUy tran.sparent skin 

 (Synapta,- Fig. 2.51), is found 

 in sandy beaches from Massa- 

 chusetts to New Jorsejr. 



The sea-lilies, or Cri- 

 noids,' are familiar as fossils 

 to residents of New York 

 State and the Ohio and 

 Mississippi valleys. The 

 li'V'ing animals are less often 

 seen, for they are inhabit- 

 ants of the deep sea. They 

 have a cup-like body, with 

 the mouth at its centre 

 directed upward, and sur- 

 rounded by tentacles (Fig. 

 2.52). Tlie cup is either 



Fig. 240. — One of the sea-cucumbers borne On the end of a long 

 (Cucumarial sliowing mouth CD, sur- , i, • ,,„,+ ,n.„j Tl^o 



^ )• * t 1 /i\ 1 (■>\ stalk or is unstalked. the 



roundmg tentacles (1), anri anu.s (S). 



About nat. size. From Lang. former Condition is more 



usual amons the fossil sjiecies ; the latter becomes more and 

 more common as the geological ages follow^ one another. 



^ Cauda, tail. 



'^ sunapUiK, fasti'ned together ; from sun, with, and apto, to fasten. 



3 krinon, lily ; eidus, form. 



