of British Mollusca . 
77 
Suborder II. CLADOHEPATICA, Bergh* 
B. Inferobranchiata. 
Earn. 3. Pleurophyllidiadae. 
Genus Pleurophyllidia, Meckel, 1816 ( = Diphyllidia , 
Cuvier, 1817). 
101. Pleurophyllidia Loveni^ Bergh. 
Off Dunbar, N.B., 30 fath., in mud (F. M. Balfour ), St. 
Andrews ( McIntosh , in litt.). 
Distribution, Denmark ( Lyhgbege Horring) , Sweden 
(Loven) y Christiania Fiord, Norway (6r. (9. Sars). 
It is the Diphyllidia lineata of Lovdn and of Forbes and 
Hanley, but not of Otto. The latter is a Mediterranean 
species. 
C. POLYBRANCHIATA. 
Fam. 4. Tritoniidse. 
Genus Tritonia, Cuvier. 
102. Tritonia Ilombergi, Cuvier. 
Shetland (A. M. A 7 .), St. Andrews (M c Intosh), Firth of 
Forth, 30 fath. {Meyer) , Moray Firth ( Gordon ), Mersey and 
Isle of Man, 25 fath. (Herdman) , Plymouth ( Garstang ). 
Distribution, Marseilles [Marion &c.), W. France (Fis- 
cher) , Denmark ( Morch ), Sweden ( Loven) ) S. and W. Nor- 
way (6r. 0. Sars). 
It is Doris atrofusca , MacGillivray, and Sphcerostoma 
Jamesonii , MacGillivray. 
103. Tritonia alba ) Aid. & Hanc. 
Subgenus Candiella, Gray. 
104. Tritonia plebeia , Johnston. 
Moray Firth ((9. Murray ), Shetland (H. M. N.) } St. An- 
drews (McIntosh), Firth of Forth, Hilbre Island^ Cheshire, 
* The arrangement here followed is for the most part that of Bergh in 
his paper just published, “ Die Cladohepatischen N udibranchien,” 1890. 
The most important difference is that I have retained Pleurophyllidia 
in a separate section Inferobranchiata. 
