92 DESCRIPTION.. 



daisy, the appearance is also very attractive. The 

 tentacles are all of the same size, about one fourth of 

 the diameter of the fully expanded disk in length : 

 they are arranged in four or five rows, not with per- 

 fect regularity ; the innermost series when distended 

 are apt to stand upright, while the others lie down, 

 or hang over the edge. Although a considerable 

 space exists between the inmost series and the mouth, 

 each tentacle may be traced by an arched ridge run- 

 ning from its base to the mouth ; the mouth is formed 

 of four rounded lobes so as to make a cross, and the 

 edge of each lobe is notched with many distinct and 

 very regular white crenations, the terminations of the 

 tentacular ridges. The disk thus formed is pale olive, 

 somewhat silvered ; deeper brown around the bases of 

 the tentacles, where this colour forms sinuoas encir- 

 cling lines. The ridges are marked throughout with 

 close-set transverse wrinkles of extreme delicacy. 



The animal, like A. crassicornis, protrudes the 

 peristoma in large corrugated pellucid lobes. It also 

 distends the tentacles to a translucent condition ; in 

 which state they are seen to be annulated with a 

 broad blackish band at their base, and with two re- 

 mote pale narrow ones, at one and two thirds of their 

 length. This appearance of the tentacles again re- 

 minds us of crassicornis. 



May 12th. In one that has been in my possession 

 about three weeks, I see several of the tentacles con- 

 tain the white seminal filaments coiled up throughout 

 their length, beautifully distinct through their pellu- 

 cid substance. 



The tentacles on being cut off and flattened by the 



