268 Dr. Leach's Classification of the British Mollusca. 



in the Museum collection and in the cabinets of Mr. Stephens, 

 the late Mr. James Sowerby, my own and others, to regard them 

 as published and having priority from 1818. Risso, Capt. Brown 

 and others have published several of them in their works. 

 I am, dear Sir, yours truly, 



J. E. Gray. 



" Classification of the British Mollusca byW.E. Leach, M. D., 1 8 1 8 " 



1. CEPHALOPODA. 



1. OCTOPODA. 



1. Sepioladce. 



1. Polypus antiquorum. 



2. Decapoda. 



2. Sepiadee. 



2. Sepiola Rondeletii. 



3. Sepia officinalis. 



3. Loliginidce. 



4. Loligo magna. 



parva. 



2. GASTEROPODA. 

 1. Gymnobranchia. 



1. Doridida. 



5. Doris Montagui. 



Britannica. 



vulgaris. 



Rocinella. 



Elfortiana. 



Leachii. 



marginata. 



nodosa. 



coccinea. 



6. Cufsea plana. 



2. Eolidiadte. 



7. Eolidia ? 



3. Tritoniadce. 



8. Tritonia Hombergii. 



9. Idalia maculata. 



2. Stegobranchia. 

 1. Pleurobranchida. 



10. Cleanthus Montagui. Bulla 

 plumula, Mont. 



11. Osanius argentatus. (B. 

 membranaceus, Mont.) 



2. Aplysiada. 



12. Aplysia varians. 



13. Esmia Griffithsiana. 



3. Marseniada. 



14. Marsenia producta. Bulla 

 haliotoidea, Mont. 



complanata. Bulla, Mont. 



4. Bulladce. 



15. Bullsea planciana. Bulla 

 aperta, Linn. 



catena. Bulla, Mont. 



16. Scaphander lignarius. Bulla, 

 Linn. 



catenatus. 

 Brownii. 



17. Haminsea Cuvieri. B. hy- 

 datis, Mont. B. Lamarckii, 

 Leach, 1816. 



dilatata. 



elegans. Bulla eleg., Gray. 



18. Eucampe Donovani. Bulla 

 akera, Mont. 



19. Roxania Cranchii. 



3. Saccobranchia. 



1. Limacidce. 



20. Arion Empiricorum. 



hortensis. 



21. Limax antiquorum. 



maculatus. 

 variegatus. 

 carinatus. 

 agrestis. 



2. Helicidce. 



22. Succinea Mulleri. H. pu- 

 tris, Mont. 



23. Vitrina Draparnaldi. 



24. Helix aspersa. Helix ? 



25. Tachsea nemoralis. 



hortensis. 



