342 JOURNAL OF CONCHOLOGY, VOL. II, NO. II, JULY, I906. 



June 2ND. — Snails lovemaking again with bodies raised and 

 fondling each other exactly as on first occasion. G.s. of both pro- 

 truded. S. extended d.s. downwards projecting and withdrawing 

 dart very rapidly for some time, but did not strike Z>. with it, Z>. 

 then projected dart rapidly and withdrew it slowly. Organ extended 

 075 inch. S. then became very active and rearing above Z>. slowly 

 forced it back into its shell until only tips of tentacles were visible. 

 G.o. much exserted but dart not used. Z>. then forced .5". over in 

 same way and projected d.s. slowly against right side of S. — dart 

 protruded nearly to annulus. 



Later. — Both very much excited and projecting darts simulta- 

 neously, crossing them repeatedly with a thrusting motion. Then 

 heads of each came side by side, S. thrusting dart wildly into space. 

 About an hour afterwards they adopted peculiar attitudes; foot-soles 

 pressing tightly together and bodies raised until the snails were standing 

 quite 3'5 inches high on their tails. G.o. in each in rapid motion. 

 They then bent over sideways until their heads nearly touched the 

 ground, and from that position they slowly regained the vertical again. 

 At 8 p.m. snails separated; D. crawled away and began feeding, S. 

 quiet. 



Later. — Snails together again in same corner of tank. G.o. not 

 protruded at first, but snails afterwards became very active, S. using 

 dart freely, and D. receiving a vigorous stab, suddenly withdrew into 

 its shell, exuding a quantity of mucous, carrying with it the dart from 

 S., which had slightly penetrated the skin just below the left tentacle. 

 Dart afterwards came floating out in the mucus. S. appeared to take 

 little notice of the loss of its dart, and did not retire into its shell. 



June 3RD. — Snails still in same position as when last observed, but 

 towards noon they separated. Z>. very sensitive ; S. sluggish ; both 

 inclined to feed. 



June 4TH. — Snails together again nearly all day. No signs of 

 effective pairing observed. On separating, both ascended to cover- 

 glass, and became quiescent. Fragment of dart found adhering to 

 lettuce leaf Noticed that S. had increased its shell considerably — 

 in fact, o'5 inch — and had also formed its lip. 



June 5TH. — Observed S. eating limestone mortar. 



June i6th. — After resting from the 6th instant, snails commenced 

 love-making again, and kept this up for fully three days, going through 

 exactly the same peculiar movements as on previous occasions. At 

 one time 6". thrust its dart into G.o. of D., driving Z>. backwards, and 

 £>. retaliated by thrusting G.o. into the mouth'of S. 



June i8th. — Found one whole dart and the fragment of another 

 in a mass of mucus. 



