242 DR, BAIBD'S CONTEIBUTIONS TOWABDa A. 



Genera belonging to the Amphinomacea, their trtie position in 

 which it is difficult to ascertain in consequence of their being 

 too indistinctly described. 



Genua I. Spintheb. 



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

 Cryptonota, Stimpson, 1843 ; Cams, Quatrefages. 

 Oaiscosoma, Sars, Grube, Carus. 



Sp. 1. Spinthee onisooides. 



Spinther oniscoides, 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 Zoologie, i. 232 ; Carus, Handbuch der Zoologie, ii. 435 ; Grube, 

 Beschr. neuer od. wen. bekannt. Annel. in Arehiv 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. AnneUs, i. 412. 



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



Sp. 2. SriNTHEE MINIAOEUS, Orube, Beschr. n. od. wen. be- 

 Tcannt. Annel. in Arehiv fur Naturg. 1860, p. 74, tab. iii. 

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

 Hah Ti'ieste, Oruhe. 



Sp. 3. Spistiiee abotious. 



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

 for Naturvidensk, 1850, p. 210; Grube, Arehiv far Naturg. 1860, 

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



Hab. Norway, Sars. 



Johnston first considered the genus Spinther to belong to the 

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

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

 he says it is so similar to the Euphrosyne horealis 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 branchiae ; and Carus and 

 Ehlers botli place it amongst the Amphinomidce. 



Genus II. Abistenia. 



Avistenia, Savigny, Syst des Annelides ; Blainville, Audouin S)- M. -Ed- 

 wards, Grube, Schmarda, Ehlers, Quatrefages. 



