MOLLUSC A. 331 



Class IX. CRUSTACEA. 



Isopoda. 



1. Armadillo vulgaris, Linn. Abundant. 



1. Oniscus asellus, Linn. Common Woodlouse, or 

 Old Sow. Abundant. It is the most destructive 

 in the garden we have, and is found every- 

 where. 



1. Porcellio scaber. Latr. Abundant. 



2. P. Isevis, Latr. Abundant. 



1. Philoscia muscorum, Scop. Not common. 



1. Platyarthris Hoffmansegii, Br. Common under 



stones in company with an ant, Myrmica 



ruginodis. 



Entomostracea. 



1. Branchipus stagnalis, Edw. Freshwater Shrimp. 



Abundant in all the streams. 



1. Daphinia pulex, Linn. Water Flea. Abundant. 

 1. Apus cancriformis, Sch. Abundant. 

 1. Cyclops vulgaris, Leach. Abundant. 



Class X. MOLLUSCA. 



Of the one hundred and sixteen British land and 

 freshwater Mollusca, seventy-two are terrestrial ; and 

 twenty-nine belong to Gasteropoda, and fifteen to 



