ZONITES. 97 



side of body grey ; tentacles and neck black. (Sturm, 

 1. 11.) 



The shell appears dark chocolate when the animal 

 is alive, and is about a quarter of an inch Fig. 33. 

 in diameter. It differs from Z. cellaria, Z. 

 alliaria, and Z. nitidula in being more con- 

 vex, more regularly striated, of a darker 

 colour, and without any trace of opacity on 

 the under side. 



Nilson describes the eggs as depressed, globose, 

 covered with a white calcareous shell. They are 

 solitary, and deposited in May or June. This snail 

 is sometimes so abundant in pine-beds and orchideous 

 houses as to be a great detriment to the plant ; hence 

 they have been called Pine Snails and Orchideous 

 Snails. 



31. 7. ZONITES excavatus. Excavated Snail. Shell 

 sub-globular, depressed, shining, transparent 

 horn-colour, regularly striated; whorls 5J or 

 6, rather rounded and closely set; base much 

 rounded, umbilicus very large and deep, exposing 

 all the whorls to the tip ; aperture nearly orbi- 

 cular lunate, (t. 4. f. 39., t. 12. f. 138.) 



Helix excavata. Bean, MSS., in Alder, Cat. 13. n. 52. ; Mag. 

 Zool. and Sot. ii. 107.; Pfeiffer, Mon. Hell 98. Helix 

 lucida var. Turton, Man. ed. 1. 57. t. 4. f. 39. Helix 

 nitida a. Jeffreys, Linn. Trans, xiii. 339. 511. Zonites 

 excavatus. Gray, Man. 175. t. 12. f. 138.; Forbes and 

 Hanley, B. M. iv. 40. t. 121. f. 2, 3, 4. 



Inhab. under decayed wood, and timber that has 

 lain some time on the ground. 

 Animal lead-coloured. 



H 



