Verm. 1 
VERMES. 
BY 
P. Chalmers Mitchell, M.A. (Aberdeen), B.A. (Ox<jn.J. 
I. — Introduction. 
II.— Ltst of Publications. 
III. — References. Systematic Classification. 
IV. — References. Subject-matter Classification. 
I.— INTRODUCTION. 
The numerous workers at this great group are gradually bringing into 
it coherence and order. The position of our knowledge up to 1888 is 
summed up by Jackson, in “Forms of Animal Life,” p. 685, 2nd 
edition (Oxford : Clarendon Press). The Enteropneusta are a very 
distinct class, with possible Vertebrate affinities. The Chcetopoda , Archi- 
annelida , and Gephyrea , except Priapulidce , are more or less closely 
related, and not far removed from them are the Ilirudinea. The Trema- 
toda , Cestoda , and Turbellaria form a natural group. The Rotifer a, 
Nemertea , Chcetognatha, Nematoda , Acanthocephala , and the smaller 
groups, are all isolated. 
The phylogenetic work of 1888 is, for the most part, on the same lines. 
Sciiimkewitsch throws doubt on the Vertebrate affinities of Entero- 
pneusta. But ApAthy, Beddard, Collin, Spencer, and others strengthen 
the coherence of the first great group ( Chcetopoda ), which Beddard, 
Spencer, and others suggest is of Platyhelminth derivation. 
Elaborate monographic work has been done by ApAthy, Saint- 
Joseph, Eulers, and others ; and equally elaborate are the anatomical 
memoirs of Bos ( Tylenchus ), Meyer, and Wir^n (Polyehceta). 
20 new genera [Bothrioneuron, Brachydrilus , Deinodrilus, Dichogaster , 
Diplocgrdia , Enchytrceoides , Lophochceta , , Teleudrilus , Vetrovermis (Oligo- 
cholia) ; 'Auchenoplax , Euarche, Lahrorostratus and Lipobranchius i f > 
Paramarphysa, 'Potamis , ' Protis , \Rhamphobrachium) (Polyehceta) ; As- 
f planchnopus ( Rotifera ) ; Haplodiscas (Cestoda) ; Prothelmins (Nema~* 
toda )] and 168 new species have been described. 
1888. [VOL. XXV.] F 2 
