50 GASTEROPODA. LIMACID. 
London, and is said to be very destructive by the gardeners, 
who name it the April Slug. 
Genus 21. Limax. 
Limax, Férussae et Auctorum. 
Apertura lateralis pone thoracis disci medium. Aperture 
branchialis dextra, posterior. Dorsum posticé saltem carina- 
tum, glandula mucifera nulla nstructum. Testa interior, post- 
thoracica, tenuis. Corpus subcylindricum, posticé acuminatum. 
Thorax concentricé striatus. Dorsum et Latera tuberculis 
elongatis, sulcisque confluentibus sculpta. Pes a corpore vix 
distinctus, lateribus angustissimis. | 
Synopsis Specierum. 
1. antiquorum; badius, fuscus, cinereus aut niger, seepius lon- 
gitudinaliter fasciatus, carina dorsali dentata aut undulata, 
capite tentaculisque badiis. 
2. maculatus ; luteus, supra nigro-maculatus. 
3. variegatus ; lutescens aut nigricante-griseus, luteo aut cro- 
ceo variegatus, thorace subconcentricé elevato-lineato et 
maculato, tentaculis czerulescentibus. 
4. carinatus ; griseus, nigricante et subcroceo variegatus, dorso 
usque ad thoracem carinato ; carima simplici, crocea. 
9. agrestis ; rufescens aut griseus, concolor aut fusco-macu- 
latus, thorace elongato posticé rotundato, carina dorsali 
brevi obliqua, collo superné bisulcato. 
Lateral aperture situated behind the middle of the thoracic 
disc. Branchial aperture on the right side posteriorly. Back 
carinated, at least posteriorly, without a mucous gland at its 
extremity. Shell slender, slightly concave, situated beneath 
the hinder part of the thoracic disc. 
Body subcylindric, acuminated posteriorly. Thoracic disc 
concentrically striated. Back and sides sculptured with elon- 
gate tubercles and confluent grooves. Foot scarcely distinct 
from the body, its sides very narrow. 
The dorsal carina is simple 1 in all the British species, at 
L. antiquorum, in which it is undulated or dentated. It rarely 
