484 EXPLANATION OF 



tion. 3. a. Trophon clathratus (as Bamfiuni) ; and 3. b, its lin- 

 gual dentition. 4. a. T. Barvicensis ; and 4. b. its head. 5, T. 

 muricatu^ (vLwiii^v the name of T. echinatum); and 5. b. its head. 



Plate TT. — 1. a. and b. Jlurex erinaceits ; and 1. c. its lingual denti- 

 tion. 2. a. and 2. b. Mangdia (Beta) turrictda ; and 2. d. its 

 lingual dentition. 3. M. (Bela septangidaris). 4. a. M. (Bela) 

 t'ufa; and 4 b. its head. (Figs. 2. a. and 3. are from drawings by 

 Mr. Alder.) 



PtATE UU. — I. a. and b. Bidkea (or Philine) aperta; 1. e. its lingual 

 dentition. 2. a. and b. Amphisphi/ra hyalina ; 2. c. its lingual 

 dentition. 3. Bulla hydatls. 4. rhiline (Bulkea) catena, and 

 Philine (Bullcea) punctata. All the figures on tliis jiUitc are from 

 drawings by Mr. Alder. 



Plate VV. — 1. Philine {Bxdlcea) scabra. 2. Bulla Cranchii. 3. 

 Ci/lichna cylindracea. 4. C, truncata (after a sketch by Mr. A. 

 Alder); and 4. a. its lingual dentition. 5. Scaphander lignaria. 

 6. xikera hullata. 7. a. and b. Tornatella fasciatcc {T. tornatilis on 

 plate). 



Plate XX. — \. Pleurohranchus plumula, 2. P.memhranaceus. After 

 drawings by Mr. Alder. A few impressions of this plate were 

 issued, marked SS. 



Plate YY. — 1. Aplasia hybrida. 2. Doris coccinea. 3. Goniodoris 

 nodosa (these two figures are after drawings by Mr. Alder). 4. 

 Idalia incvqualis. 5. Polycera qicadrilineata. 



Plate ZZ. — 1. Hcrmoea dendritica. 2. Proctonotus niucroniferus. 

 3. Lornonotus marmoratus. 4. Ancula eristata. 5. Dendronotus 

 arborescens (all after the figures by Alder and Hancock). 



Plate AAA. — 1. Triopa claviger. 2. JEgirus punctilucens (these 

 figures are after Alder and Hancock). 3. Tritonia Hombcrgi 

 (copied from the figure by Mrs. Johnston). 4. Doto coronata. 

 4:.* D.fragilis. 5. ScylUna pelagica. 



Plate BBB. — 1. Eolis papiUosa, var. Zetlandica. 2. E. coronata, 

 from our drawing of the original specimen. 3. E. viridis, from a 

 Cornish example. 4. E. exigua, after Mr. Alder's drawing. 5. 

 EnMetonia minuta. 6. Antiopa eristata (under the name of 

 ^1. splendida, see note in Appendix) ; after Mr. Spence Bate's 

 drawing. 



Plate CCC. — 1. Alder ia nwdesta. 2. Runcina Hancocki. 3. Elysia 

 viridis. 4. Liraapontia nigra. 5, Acteonia corrugata. 6. 

 Cenia Cocksii. All from Mr. Alder's drawings, except the first, 

 which is from a figure by Mr. Spence Bate. 



Plate DDD. — 1. a. Arion empiricorum ; 1. b. the same, at rest and 

 contracted ; 1. c. part of the surface of its shield and body mag- 

 nified. (This figure is referred to wrongly in vol. iv. p. 7, as fig. 4. 



