134 PNEUMONOBRANCHIATA. 



even detached from one another, or turned in the 

 contrary direction, sometimes occur. (See Ferussac, 

 Hist Moll t. 34. f. 8, 9. t. 32. a. f. 2.) 



Mr. Sheppard believes that the plain sort (H. ne- 

 moralis Shepp.), the one-banded (H. cincta Shepp.), 

 and the five-banded (H.fasciata Shepp.), are distinct 

 kinds, because he says they always breed together ! 

 He also observes that the spicula of the one-banded 

 kind is four-sided in the middle, and perfectly straight; 

 in the five-banded it is also four-sided in the middle, 

 but curved, as in H. aspersa ! 



When the shells are lying exposed to the sun with- 

 out any shelter, their upper surface often becomes of a 

 fine pink or rose-colour. 



The eggs are white, ovate. (See Pfeiffer, t. 7. f. 3.) 



The animals sometimes have a morbid appetite, 

 and eat worms, and even cooked meats. (See Soic. 

 Zool. Journ. i. 285.) 



On this animal is sometimes found a parasitic 

 insect, which has caused considerable interest among 

 the entomologists, and which has proved to be the 

 larva of Drilus Jlavescens. (See Mielzinshj, Isis, xvi. 

 (1825), p. 477.) 



Messrs. Brard and Deshayes propose to unite 

 Helix nemoralis and H. hortensis into one species. 

 M. Deshayes states that he has often seen the two 

 kinds in copulation ; that these connections he believes 

 to be fertile, for in the same situation he has found 

 the Helix hybrida with its rosy mouth ; and more lately 

 M. Deshayes proposes to consider Helix 7iemoralis, 

 H. hortensis, H. hyhricla, H sylvatica, and H. austriaca, 

 as all varieties of the same species. (Hist. Anim. S. 

 Vevtcb. viii. 56.) 



