138 



PTYCHOGENA LACTEA. 



pouches as there are points to the projections of the chymiferous 

 tubes ; the folds become smaller and smaller (Fig. 222) towards the 

 abactinal pole, and are connected by a loose fold with the actinostome. 

 The opening of the actinostome is large ; its folds are small, and do 



Fig 231. 



not form regular lips, but merely an irregular quadrangular frill. (Fig. 

 223.) The tentacles are extremely numerous, opening into a large circu- 

 lar tube ; they are very much flattened in one direction (/, Fig. 224) ; 

 between every two tentacles is found a club-shaped appendage, made 



up of large cells somewhat like those of Lafoea calcarata (b, Fig. 224) ; 

 the tentacles are capable of great expansion, and when contracted are 

 usually curled up tightly, as is the case in Melicertum and Staurophora ; 

 they are very frequently tied u-p in festoons, as in Fig. 220. This 



Fig. 220. Profile view of Ptychogena, somewhat reduced. 



Fig. 221. Magnified view of the genital organs, seen from the abactinal pole. 



Fig. 222. The same as Fig. 221, seen in profile, on a somewhat smaller scale. 



Fig. 223. Actinostome. a, opening of actinostome ; p, point of attachment of the digestive 

 cavity ; I, lips of the actinostome. 



Fig. 224. Magnified base of tentacles and club-shaped appendages. /, sweUing of tentacles ; 

 h, club-shaped appendages. 



