184 ARRANGEMENT OF BRITISH PLANTS. 



a a | Vittte filiform, involucella absent or few-leaved Pastinaca. 



( Vittce clavate, involueella many-leaved Heracleum. 



j>t> (Calyx 5-toothed, seeds with many vittee Archangelica. 



' (Calyx obsolete, channels with single vittce Angelica. 



pp ( Channels with single filiform vittce Tordylium. 



' (Channels each with 3 vittce Condylocarpus 



tt 



* ( Fruit armed with prickles B. 



( Fruit smooth, or nearly so D. 



t» (Fruit beaked Anthriscus. 



( Fruit not beaked C. 



p ( Fr. with about 4 rows of prickles ; rays of umbel 3..Caucalis. 

 ( Fr. covered with prickles; rays of urab. exceeding 4.Torilis. 



j. (Umbels without involucra Smyrnium. 



' (Umbels with at least a partial involucre E. 



p ( Fruit laterally compressed, linear F. 



' ( Fruit laterally compressed, ovate I. 



-p (Fruit beaked Scandix. 



' ( Fruit beakless H. 



tt ( Fruit with blunt ridges ; pericarp solid Chcerophyllum 



' (Fruit with acute ridges; pericarp hollow Myrrhis. 



T ( Partial involucre 3-lvd. halved ; ridges of fr. crenate. Conium. 

 ( Partial involucre many-lvd. ridges fine or depressed. K. 



tt- (Flowers monoecious Echinophora. 



' (Flowers hermaphrodite Physospermum 



ttt 

 Fruit globose, partial involucre halved Coriandrum. 



The last-named genus is here enumerated as indigenous to 

 this country, although it is still a matter of doubt whether it 

 ought to be ranked as such ; but the numerous and wild lo- 

 calities in which it has been found, together with its frequent 

 abundance, tend considerably to strengthen the opinion of its 

 being so. 



(To be continued.) 



Art. IX. — Observations on the Rodentia, with a view to point out 

 the groups as indicated by the structure of the Crania, in this Or- 

 der of Mammals. By G. R. Waterhouse, Esq., Curator to the 

 Zoological Society, Vice-Pres. of the Entomological Society. 

 ( Continued from page 96). 



Family II. — Myoxioe. 

 Dentition. — Incisors laterally compressed. Molares -Jf, 

 unequal in size, rooted; the series on each side of each jaw 

 widely separated and parallel. 



