484 EXPLANATION OF 



tion. 3. a. Trophon dathratus (as Bamjiutn) ; and 3. b. its lin- 

 gual dentition. 4. a. T. Barvice^uis ; and 4, b. its liead. 5. T. 

 muricatus (nwHex the name of T. cdiinatwrn) ; and 5. b. its head. 



Plate TT. — 1. a. and b. Murex erinaceus ; and 1. c. its lingual denti- 

 tion. 2. a. and 2. b. Mangelia (Bela) turricula ; and 2. d. its 

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

 rufa; and 4 b. its head. (Figs. 2. a. and 3. are from drawings by 

 Mr. Alder.) 



Plate UU.— 1. a. and b. Bidlcea (or Philine) aperta; 1. c. its lingual 



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



dentition. 3. Bulla hydatis. 4. Philine (Bullcea) catena, and 



Philine (Bidlcea) punctata. All the figures on this plate are from 



- drawings by Mr. Alder. 



Plate VV. — 1. Philine {Bullcea) scahra. 2. Bulla Cranchii. 3. 

 Cylichna cylindracea. 4. C. truncata (after a sketch by Mr. A. 

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

 6. Akera bidlata. 7. a. and b. Tornatella fasciata {T. tornatilis on 

 plate). 



Plate XX. — 1. Pleurohranchus pliimula. 2. P. viemhranacetcs. After 

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

 issued, marked SS^ - 



Plate YY. — 1. Aplysia hyhrida. 2, Doris coccinea. 3. Goniodoris 

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

 Idalia incequalis. 5, Polycera quadriliaeata. 



Plate ZZ. — 1. Hermcea dendritica. 2. Proctonotus mucroniferus. 

 3. Lomonotus marmoratus. 4. Ancula cristata. 5. Dendronotus 

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



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

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

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

 4.* D. frag His. 5. Scyllcea pdagica. 



Plate BBB. — 1. Eolis papulosa, var. Zedandiea. 2. E. coronata, 

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

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

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

 A. splendida, see note in Appendix) ; after Mr. Spcnce Bate's 

 drawing. 



Plate CCC. — 1. Alderia modesta. 2. Runcina Hancochi. 3. Elysia 

 viridis. 4. Limapontia 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. Ai-ion 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. 



