242 DR, baied's contbibutioks towards a 



Genera belonging to the Amphinomacea, their true position in 

 which it is difficult to ascertain in consequence of their being 

 too indistinctly described. 



Genus I, Spinthee. 



Spinther, Johnston, 1845 ; Van der Hoeven, Cams, Grube, Ehlers. 

 Cryptonota, Stimpson, 1843 ; Cams, Quatrefages. 

 Oniscosoma, Sars, Grube, Cams. 



Sp. 1. Spinthee oniscoides. 



Spinther ouiscoides, Johnston, Ann. Sf Mag. Nat. Hist. torn. xvi. p. 9, 

 tab. ii. f. 7-14, Catalogue of British Non-parasitical Worms, 

 p. 127, tab. xiv. (vi. in text), f. 7-14 ; Van der Hoeven, Handb. 

 der Zoulogie, i. 232 ; Cams, Handbuch der Zoologie, ii. 435 ; Grube, 

 Beschr. neuer od. wen. bekannt. Annel. in Archiv f. Naturg. 1860, 

 p. 74. 



Cryptonota citrina, Stimpson, Marine Invert, of Grand Manan (Smith- 

 sonian Contributions to Knowledge), p. 36, tab. ii. f. 27 ; Quatre- 

 fages, Hist. Nat. Anneles, i. 412. 



Hub. Belfast Bay, Thompson ; Grand Manan, Stimpson. 



Sp. 2. Spinthee miniaceus, Grube, Beschr. n. od. wen. be- 

 kannt. Annel. in Archiv fur Naturg. 1860, p. 74, tab. iii. 

 f. 3, 3a-b ; Carus, Hand, der Zool. ii. 43G. 

 Hub Trieste, Grube. 



Sp. 3. Spinther aectictjs. 



Oniscosoma areticum, Sars, Reise i Lofoten og Finmarken, in Magazin 

 for Naturvidensk. 1850, p. 210 ; Grube, Archiv fur Naturg. 1860, 

 p. 75 ; Carus, Handb. der Zoologie, ii. 436. 



Hob. Norway, Sars. 



Johnston first considered the genus Spinther to belong to the 

 Aphroditacea, but afterwards he says it is more allied to Eu- 

 fhrosyne. In his ' Catalogue of British Non-parasitical Worms,' 

 he says it is so similar to the Euphrosyne borealis in external 

 appearance, that the identity of the two species may be ques- 

 tioned, p. 127. Sars considers his genus Oniscosoma might be- 

 long to Euphrosyne, only that it wants branchisp ; and Carus and 

 Ehlers botli place it amongst the Amphinomidce. 



Genus II. Aristenta. 



Aristenia, Savigny, Syst des Annelides ; Blainville, Audouin Sf M.-KJ- 

 nurrds, Grube, Schninrdn, Ehlers, Qiititrefoges. 



