the Trondhjem Fiord. 357 



46. Lacuna divaricataj Fabr. 



Large at Rodberg, Laminarian zone. 



47. Skenea planorhis, Fabr. 

 Eodberg, among weeds. 



48. Ri'ssoa tnconspi'cua, Alder, var. albella, Lovdn. 

 Laminarian zone, Rodberg. 



49. Ri'ssoa parva, Da Costa, var. tnterrupta, Adams. 

 Laminarian zone, Trondhjem. 



50. Alvania Jeffreysii, Waller. 

 Trondhjem and Rodberg, 150-300 fath. 



51. Alvania cimicoides, Forbes. 

 Trondhjem and Rodberg, 150-300 fathoms. 



52. Alvania subsoluta, Aradas, = ^4/ya«/a abi/ssicola, G. O. 



Sars, tjpus (Forbes and Hanley, varietas). 



250-300 fath., off Rodberg. As it appears to me that 

 Jeffreys has introduced great confusion respecting the syno- 

 nymy of this shell, it will be well to attempt to clear the 

 matter up. This confusion commenced in his paper on 

 Mediterranean MoUusca in the ' Annals ' of 1870, and was 

 •made worse by his latest views, as expressed in his " MoUusca 

 of the 'Lightning' and 'Porcupine' Expeditions" (Proc. 

 Zool. Soc. 1884, p. 115). 



I will give the synonymy of the species as I now take it 

 to be, a list of the specimens in my collection on which my 

 conclusions arc based, and some notes on the reasons of those 

 conclusions. 



1. Alvania Testce (Aradas and Maggiore). 



1844. Rissoa Testa, Ara. & Magg. Cat. rag. Catania, pi. ix. fig. 4. 

 ■ 1870. liissoii abyssicola, var. conformis, Jeffreys, " Mediterraneau Mol- 



lusca," Ann. & Mag. Nat. Hist. ser. 4, vol. v. 

 1880. lit'sisoa Testce, Monterosato, Bull. Soc. Malac. Ital. vol. vi. p. 68. 

 1884. Rissoa Fischeri, Jeffreys, Proc. Zoul. Soc. p. 113, pi. ix. fig. 1. 

 1884. liissoa Testce (partim), id. ibid. p. 115, pi. ix. fig. 4. 

 1884. Acto7iia Testce, Monterosato, Nomencl. gen. e spec, di alcune 



Conchiglie Medit. p. 61. 



Ilab. Mediterranean (not North European). 



1 am indebted to the Marchese di Monterosato for ten 

 specimens labelled ^''Alvania Testce = con for mis, Palermo." 

 'I'heso, from tlieir more numerous ribs and the peculiar shoul- 

 dering (above and below) of the volutions, agree more closely 

 with Jeffreys's figures of R. Fischeri than with tho.se he gives 



Ann. & Mag. N. Hist. Ser. 6. Vol. xii. 27 



