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-sha23ed appendage, made 



Fig 232. 



Fig. 223. 



Fig. 22i. 



up of largo cells somewliat like those of Lnfma calcarata (h, 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 up in festoons, as in Fig. 220. This 



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



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



Fig. 222. Tlic same as Fig. 221, seen in ])rofile, on a somewhat smaller sealc. 



Fig. 22.S. Actinostome. a, opening of actinostome ; p, point of attachment of the digestive 

 cavity ; /, lips of tlie actinostome. 



Fig. 224. jMagnlficd base of tentacles and club-shaped appendages. /, swelling of tentacles; 

 h, elub-sliaped appendages. 



