PLEUROPHYLLIDIA. 17 



an oblique row of very numerous leaflets or laminaa on each 

 side : vent lateral, posterior : generative organs on the same 

 side, but near the front. Hermaphrodite. 



Shell none, either external or internal. 



For further particulars of this curious family see an 

 admirable monograph by Dr. Bergh of Copenhagen, 

 published in the ' Naturhistorisk Tidsskrift^ for 1866 

 and 1867. Philippi placed it in the "Phyllidiens'' of 

 Lamarck, together with Chiton, Patella, and Gadinia. 

 Forbes and Hanley called it Phyllididce, Bergh Pleuro- 

 phyllididce. 



Genus PLEUROPHYLLI'DIA*, Meckel. PL I. f. 4. 



Mantle uninternipted in front, and marked with longitu- 

 dinal lines or warty : tentacles close together and contiguous, 

 concealable within a distinct fleshy sheath. 



Diphyllidia of Cuvier, but published one year subse- 

 quently to the above generic name, which has been 

 adopted by Messrs. Adams, Woodward, and Bergh. 

 De Blainville proposed another name, Linguella-, and 

 he supposed that Armina of Rafinesque was identical 

 with Diphyllidia. 



Pleurophyllidia LovE'Nif, Bergh. 



P. Loveni, Bergh in Foren. vidensk. Meddel. for 1860, p. 328. Bij^h^l- 

 lidia lineata, F. & H. iv. (App.) p. 290, pi. KKK. f. 1-3. 



Body slug-like, and rather slender, much narrower and 

 pinched up towards the tail or extremity : mantle pale red- 

 dish-brown, interspersed with numerous minute black specks, 



* From its leaf-like gills on the sides. 



t Named after Professor Lov6n, the eminent Swedish zoologist. 



