346 NOTES ON SOME BRITISH NUDir.RANCHS. 



ami ill many cases it seems clear from the author's descriptions that 

 they do not possess the characters of Lameliidoris. 



In identifying the specimens noticed below as L. ohlonga, L. depressa, 

 and L. 2>i(silla, 1 have been chiefly guided by the labels which they bear 

 in the collection at the Plymouth Marine Laboratory. I see no reason 

 to doubt these identifications, though it might be difficult to establish 

 them from an examination of preserved specimens only. 



LAMELLIDORIS BILAIMELLATA (L.). 



This common species has been fully described by Alder and Hancock 

 and IJergh. The back is covered with distinct, tall, and sometimes 

 clavate tubercles, not unlike those of Staurodoris verrucosa. The 

 tubercles at the side of the rhinophores are not conspicuous. 



The inner teeth are large, hamate, smooth, and tapering at the tip. 

 The outer are plate-like, with a rudimentary and not very distinct hook. 

 Between the rows there is a series of ear-shaped folds on the rhachis. 



LAMELLIDORIS OBLONGA (A. & H.). 

 (A. & H., Mon. of Brit. Nud., Fam. i., pi. 16, figs. 4-5.) 



Three preserved specimens from Plymouth. It would appear that 

 this species is recognizable by its shape. Its measurements are roughly, 

 length, 8 mm.; breadth, 3'7 mm.; whereas L. hilarneUata measures about 

 12 mm. in length and 9 mm. in breadth. Tiie animal, as preserved, 

 is yellowish, and covered with low, flat tubercles on the dorsal surface. 

 The l)ranchite are very inconspicuous, and are not distinguishable from 

 the surrounding tubercles on a superficial examination. The openings 

 of the rhinophores are closed by two tubercles. The rhinophores are 

 exserted and very long. As preserved, the oral veil is remarkably 

 pointed, and the anterior margin of the foot follows its outline. 



The buccal crop is large, and divided into two halves by a median 

 band. The radula is very fragile, and consists of twenty-two, thirty- 

 three, and forty-five rows respectively in the three specimens. The 

 inner tooth (Fig. 3. a.) has a broad base, and is divided into three parts 

 by constrictions. The denticulations on the uppermost part are very 

 fine, but clear. The outer tooth (Fig. 3. b.) bears a distinct hook. 



LAMELLIDORIS DEPRESSA (A. & 11.), 



One preserved specimen from Plymouth. The mantle margin is 

 wide, and the dorsal surface bears ])apillose tubercles and contains very 

 long spicules. The colour is yellowish, with a few black and brown 

 spots. 



