74 STENJA PUN0TAL1S. 



rather roughened ; the colour generally is yellowish- 

 brown, the eyes, the tip and the rings of the abdo- 

 men, and the tip of the tongue-case, chestnut, the 

 spike still darker. (John Hellins, 9th October, 1884 ; 

 B.M.M., November, 1884, XXI, 121—123.) 



Cataclysta lemnata. 

 Plate OLI, fig. 1. 



On the 10th of November, 1874, Mr. W. C. Boyd 

 kindly sent me six young larvse of this species in 

 their cases, and I found no great difficulty in keeping 

 them in thriving condition by placing them in a 

 vessel of water with a supply of Lemna minor floating 

 on the top. It gave me much interest and pleasure 

 to watch them from time to time, and I have set down 

 my observations as it occurred to me to note them. 



When they first arrived these larvae were often 

 protruding from their cases half or more of their 

 bodies, both on the surface of the water and also below 

 it, while apparently examining the surrounding weed; 

 often they would ascend a little way on the side of the 

 glass vessel, and fix themselves there with only their 

 head downwards and projecting into the water, while 

 the other end of their cases above it on the glass 

 would have a bright silvery air-bubble. 



Sometimes they would descend beneath the surface 

 of the water, down the side of the glass, for an inch 

 or two, and even more ; and then, while crawling, they 

 often protruded as many as eight segments, showing 

 a line of silvery sparkles along each side in the spira- 

 cular region, the other parts of the body appearing 

 blackish. 



On the 16th of the month, having noticed that one 

 had remained at the very bottom of the water, hidden 

 entirely in its case, for some time, I removed it to 

 another vessel of water, the better to observe its 

 behaviour; at first it floated on the surface, but after 



