PLATE X {continued). 



4-2(7. — Mandible of same divided and covered lliroiighout witli rows of 

 irregular spiny processes. 



4.3. — Oncidoris (doris) bilammellafa, Brit. 2 — 1 — 2. Median small, reflexed 

 cusp. 1st lateral claw-like, remarkably strong, and produced at 

 base; 2iid smaller, similar, booked. 



4-i.— Sea pander I'lgnarius, Vigo Bay. Odontofore, median apparently want- 

 ing: laterals bold, flattened out, rib-like; very strong, o])aque, 

 dark-coloured teetb. Buccal plate composed of three calcareous 

 plates, triangular in shape. " Gullet in the form of a corn-sack ; 

 often found distended with scores of a little bivalve Macfra suh- 

 truncata. The sack gradually empties itself into the gizzard." 



PLATE XI. 



Rhipidoglossa (00—1—00). 



45. — Fliasianella Australis, Port Curtis. Eamily Turbinidae. Odontofore 

 remarkably bold. Medians semicircular, ten reflexed cusps, t he- 

 two centre of which are the larger, diminishing in size as they ap- 

 proach uncini, the first six of which are remarkable for the 

 streno-th of their books; uncifSi about sixty in number, hooked, 

 diminishing outwards. 



^io,^Jmperator imperialis, Bombay. Medians reflexed and hooked; centre 

 one produced at base; five on either side similar. Uncini numerous 

 hooked, serrated, diminishing outwards. 



47. — Thasianella pulliis, Brit. A dark-coloured short band, contrasting with 

 preceding specimen. Medians similar, reflexed or hooked; uncini 

 numerous, hooked, diminishing outwards. 



4S. Trochus crasftus, Madeira. Medians eleven; central bold and pro- 

 duced, base forming alffi; reflexed, denticulate. Uncini hooked, 

 numerous, between seventy and ninety, diminishing outwards. 



49. Tr. fragarioides, Malta. Medians eleven, centre largest, hooked; 



uncini numerous, hooked, denticulate, diminishing outwards. 



^{).— Turlo Australicu. Medians eleven, reflexed, hooked ; uncini numerous, 

 simple, reflexed, gradually diminishing. 



51.— r^. ruhkundus. New Zealand. Medians eleven, reflexed hooked teeth 

 considerably produced at base, increase in size as they leave the 

 central tooth, and meeting a larger and bolder hooked-shaped tooth. 

 Uncini numerous, diminishing outwards, becoming fine small teeth. 



52. Neritina zebra, Brit. Median small, subquadrate, base produced. 



Uncini, 1st large, transverse, subtriangular, folded on itself. 

 2nd and 3rd suboval, transverse, giving a currycomb appearance 

 to the arrangement. Uncini about sixty, reflexed, serrated, and 

 symmetrically arranged in semicircular rows. 



^^.—Neriia alhicilla, Mauritius. Median small, subquadrate, reflexed. 1st 

 uncini articulating with median; subtrapezoidal. 2ud, wliicli has 

 a shaft and a head, the transverse portion of which is trapezoidal ; 

 the shape, however, is rather remarkable, and not very constant 

 throughout. TJncini numerous similar teeth, hooked, diminishing 

 outwards. 



