tgog. RiDDELL. — SpintJier oniscoides, Joh7isto7i. 107 



Spinther. But if Verrill's identification is correct, which I see 

 no reason to doubt, then Stimpson's specific name must be 

 attached to this species. Verrill seems to have had no doubt 

 as to the identity of the specimens sent to v. Graff". 



The genus Spinther therefore includes four species, as 



follows : — 



I. Spinther onlscoides, Johnstou. 



S. oiiiscoides, Johnston (i), 1845. 

 S. viiniaceus, Wilson (12), 1904. 



II. Spinther citrinus (Stimpson). 



Cryptonota citrina, Stimpson (li), 1854. 

 Spinther arctiais, Hansen (4), 1882, 

 Spinther major, Levinsen (6), 1883. 

 Spinther oniscoides, v. Graff {2),. 1887. 



III. Spinther miniaceus, Grube. 



Oniscosoma arctiaan, Sars (10), 1850. 



Spinther arcticus^ Sars, 1862 ; Malmgren (7), 1867 ; Levinsen 



18S3. 

 S. oniscoides, M'Intosh (8), 1877. 

 S. miniaceus, Grube (3^, 1861 ; Drasche, 1885 ; v. Graff, 1887 ; 



M'Intosh (9), 1900. 



IV. Spinther arcticus, Wiren. 



S. arcticus, Wiren (13), 1883 ; Drasche, 1885 ; v. Graff, 1887. 



The Species may be diagnosed briefly as follows : — 



A. Parapodia without dorsal cirri ; 



(i) Small: up to 24 segments; setae two-pointed; dorsal 

 caecum pouched ... ... ... fniniaceus. 



(2) Large; up to 50 segments ; setae one- and two-pointed; 

 caecum not pouched ... . . ... arcticus. 



B. Parapodia with dorsal cirri ; caecum not pouched ; 



(3) Small ; segments up to about 25 ; setae two-pointed ; lip 

 of shaft of hook plain ... ... ... oniscoides. 



(4) Larger ; 48 segments ; set^ mostly one-pointed ; lip of 



shaft of hook serrated ... ... ... citrinus. 



References. 



1. Ed. CI.APAREDE: Bibl. Univ. et Revue Scient. {Arch. Sc. Phys.et 



Nat.), xxii , Geneva, 1865. 



2. L YOi<i G'B.l^'B-e: Zeitsch.f. wiss. Zool.,^\\\. Separately as : Arbeiten 



aus dent Zool. Inst, zu Graz, ii. Bd., No. 3, 1887. 



3. E. Grube: Aixhiv far Naturgeschichte, 26 ]aihr., i. Bd., i860. 



4. G. A. Hansen : Nyt Magazin for Natiu-videnskaberne, xxiv., xxv., 



1879-1880. 



5. G. Johnston : Ann. Mag. Nat. Hist., xvi., 1845, and Brit. Mus. 



Cat. of Worms, 1865. 



