of British Mollusca. 77 



Suborder II. CLADOHEPATICA, Bergl,^. 



B. Infekobranchiata. 



Fani. 3. Pleurophyllidiadse. 



Genus Pleurophyllidia, Meckel, 1S16 {=Di2jhyllidia, 

 Cuvier, 18.17). 



101. PleurophyUidia Loveni^ Bergli. 



Off Dunbar, N.B., 30 fatli., in mud {F. M. Balfour), St. 

 Andrews [Mcintosh, in litt.). 



Distribution. Denmark {Lyngheye i^ Hbrriny), Sv/eden 

 (Loven), Ciiristiania Fiord, Norway {G. 0. Sars). 



It is the Diphyllidia lineata of Lov^n and of Forbes and 

 Haulej, but not of Otto. Tlie latter is a Mediterranean 

 species. 



C. P L Y B R A N C H I A T A. 



Fam. 4. Tritoniidae. 

 Genus Tritonia, Cuvier. 



102. Tritonia Homhergi, Cuvier. 



Shetland {A. M. N.), St. Andrews (M'Tntosh), Firth of 

 Forth, 30 fath. (Meyer), Moray Firth {Gordon), Mersey and 

 Isle of Man, 25 fath. (Herdnian), Plymouth [Gartitang) . 



Distribution. Marseilles [Marion &c.), W. France [Fis- 

 cher) ^ Denmark (M'orch), Sweden {Loven), S. and W. Nor- 

 way [G. 0. Sars). 



It is Doris atrofusca, MacGillivray, and Sphwrostonia 

 Jameson a, MacGillivray. 



103. Tritonia alha, Aid. & Hauc. 



Subgenus Candiella, Gray. 



104. Tritonia ylebeia^ Johnston. 



Moray Firth [G. Murray), Shetland [A. M. N.), St. An- 

 drews [Mcintosh), Firth of Forth, Hilbre Island, Cheshire, 



* The arraugemeut here followed is for the most part that of Bergh in 

 his paper just published, "Die Cladohepatischen Nudibrauchien," 1890. 

 The most important difference is that I have retained PleurophyUidia 

 in a separate section Inferobranchiata. 



