CRINOIDEA 



63 



Fig. 48. — Crinoid (Pentac'rinus), half natural size. (Brehm.) 



Fig. 49. — Mouth area of a crinoid {Comat'ula), showing the course of the 

 intestine leading from the mouth (m) to the vent {a); g, grooves leading 

 from arms to mouth. (From Kingsley's " Comparative Zoology," Henry 

 Holt and Co., PubUshers.) 



Digestive System. — The mouth is directed upward and leads 

 into the digestive tract, consisting of esophagus, stomach, and 



