18 Moll 
MOLLUSCA. 
results to the different and inexact methods which they used ; he states 
that the renewal is easier when the animal is well fed, and that it fails 
almost surely soon after hibernation, or in the season of propagation, the 
animal being in the first case exhausted by long abstinence, in the second 
needing all its energy for another purpose; Helix pomatia, arhustorum, 
and fruticum are more sensitive than H. nemoralis and hortensis. Slugs 
are more difficult to be kept in confinement than snails with shells. The 
renewal only takes place if the supra-pharyngeal ganglion has not been 
injured. The mode of renewal of the eye is microscopically described ; 
it is essentially as in its first formation in the embryo, by invagination of 
the surface epithelium. Studien fiber die Regenerations-erscheinungen, 
i. 1880, 56 pp., 2 pis., large’4to ; abstract in J. R. Micr. Soc. iii. p. 765. 
Reparation of the shell in Limncea elodes described by R. Bunker, 
Am. Nat. xiv. pp. 522 & 523. 
13. Abnormities. 
Sinistral specimen of Helix virgata (Mont.), Yarmouth, and adspersa 
(MfilL), Redcar, Ashford, and Hey, J. of Conch, iii. pp. 73 & 74, & 
120 ; of II. globulus (Mfill.), Craven, P. Z. S. 1880, p. 619. 
Sinistral variety of Bulimus senilis ; Gassies, J. de Conch, xxviii. 
p. 327, pi. X. fig. 3. 
Sinistral specimens of Buccinum undatum (L.) ; about 12 in 15 years 
found in the Sound, by J. Collin, Nat. Tidskr. (3) xii. p. 439. 
Dextral specimen of Clausilia duhoisi (Charp.); Bottger, JB. mal. 
Ges. vii. p. 144. 
A reversed specimen of Tellina plicata (Val.), the hinder fold of the 
shell bent to the left, observed by P. Fischer, J. de Conch, xxviii. 
p. 234. 
Bottger and Weinland call attention to the strange occurrence of 
very numerous scalarid and very few normal specimens of Helix rupestris^ 
observed on the island Syra by H. Blanc. Nachr. mal. Ges. 1880, p. 67 ; 
JB. mal. Ges. vii. p. 362, footnote; and Kosmos, iv. pp. 211-213. 
Specimens of a Valvata ^ all distorted, and PlanorhiSy less distorted, 
found in a marl layer of Lawdor’s Lake, near St. John, New Brunswick, 
all extinct ; Hyatt, “ The Genesis of the Tertiary Species of FlanorbiSj * 
Annivers. Mem. Boston Spc. p. 31. 
Keeled and acuminated abnormities of Buccinum undatum (L.) ; Collin, 
Nat. Tidskr. (3) xii. p. 438. 
Monstrosity of Cyproia tigris (L.), back flattened, front puffy, described 
by Giebel, Z. ges. Naturw. (2) v. p. 664. 
Albino specimens of Helix hortensis (Mfill.) are more common in wet 
years, and specimens with coloured bands have the growth of the last wet 
year not coloured; Dietz, JB. Yer. Augsb. xxv. [1879], p. 92. 
Albino varieties of Helix obvoluta, rotundata, and Clausilia hiplicata 
found on heaps of loose stones in the “ Muschelkalk ” region near Ochsen- 
furt. Northern Bavaria, the first exclusively without normal specimens ; 
by S. Clessin, Mal. Bl. (2) ii. pp. 155-157. The thickness of the shells 
is quite normal, and the author thinks that the want of rotten wood. 
