i9t^- Reviews. 235 



it best to divide the Nudibraiichiata. The Holohepatica he divides into 

 nine families, and the Cladohepatica into twent)-tvvo families, including 

 the families Hermaeiiae, Phyllobranchidae, Elysiidae, and Limapon- 

 tiidae, which are often separated from the Nudibranchiata as a distinct 

 group Ascoglossa. 



The species which form the subject of notices in the second section of 

 this work, the author says falls into three classes, viz. : — " those figured 

 in the drawings preserved at Newcastle ", some " species which are not 

 described in the Monograph " and a few " mentioned in the Monograph 

 about which additional information is now furnished." 



The descriptions are largely repetitions of the author's notes pub- 

 lished in the /oiimal of the Marine Biological Association and in the 

 Proceedings of the Malacological Society of London. Apparently the only 

 new form described is a variety {nigra) of Doto pinnatifida, observed by 

 the author at Plymouth, and the only species not previously recorded 

 from the British Isles is Doto cinerea, Tr., " living specimens probably 

 referable to this species" having also been seen by the author at Ply- 

 mouth. Dendronotns lacteus (Thompson), described from a specimen 

 obtained in Strangford Lough, and generally regarded as a white variety 

 of Dendronottis f rondos lis, is again accorded specific rank. In this section 

 the author gives his views as to the species of the genus Lomanotus 

 and criticises the opinions recently expressed by Mr. N. Colgan and 

 Mr. G. P. Farran. 



The synopsis of families, genera, and species for the nudibranchiate 

 fauna of the British Isles will prove most useful to the student, espe- 

 ciallj' as forms or groups found in the adjacent parts of the north-eastern 

 Atlantic have been included, enclosed in square brackets. 



A great defect in this work is the almost entire absence of localities 

 for the British species, except for some of those described in the second 

 section. It would not have been difficult to have mentioned the 

 different parts of the British coasts at which the various species have 

 been obtained, for as the anchor remarks " nudibranchs have been 

 systematically collected in comparatively few localities of the British 

 Isles." 



The following species included in the synopsis have been added to 

 the British list since the publication of Part VII. of the Monograph : — 

 Doris verrucosa, D. mactdata, D. testttdinaria, Crimora papillata, Adalaria 

 Loveni, Lamellidoris hitcocinctay Pieurophyllidia Loveni, Lomanotus Genei^ 

 Hancockia eudactyloia, Hero fonnosa^ fanolus flagellatus, Doto cuspidala, D. 

 cinerea, Coryphella sahnonacea, Cumanotus Beaunionti, Aeolidiella songuinea, 

 Stiliger bellulus and Limapontia depressa ; L. nigra, Elysia viridis, Acteonia 

 corrugata and Cenia Cocksi although recorded as British before the year 

 1855 were regarded by Alder and Hancock as belonging to a distinct 

 group Pellibranchiata, and are also not described in Parts I-VII. of the 

 Monograph. The following five species included by Alder and Hancock 

 in the Monograph are not mentioned in the synopsis, viz. : — Doris 

 pusilla, Eolis elegans, E. arenicola, E. Couchii, and E. purpurascens ; the first 

 three species were not only described but also figured. 



