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1.
Siphonaria gigas Sowb., Panama, the animal contactracted in spirit; gr, siphonal groove on right side (A)
Gadinia peruviana, Sowb., Chili, shell only; gr, mark of siphoid groove to right of head
2.
Spondylus petroselinum Sowb., Mauritius; on a coral
3.
Three stages in the growth of Pteroceras rugosum Sowb., E. Indies, showing the development of the "fingers"
4.
Girdles of various Chitonidae.
A, Radsia sulcata Wood;
B, Maugeria granulata Gmel.;
C, Enoplochiton niger Barnes;
D, Acanthochiton faxcicularis L.;
E, Tonicia fastigiata Sowb.
5.
Scaphites acqualis Sowb., Cretaceous
Crioceras bifurcalum Qmenst, Cretaceous
6.
Various forms of Ammonoides:
A, Goniatites crenistria J.Phil., Carb. Limestone;
B, Ceratltes nodosus de Hann., Muschelkalk;
C, Ammonites (Parkinsonia) Parkinsoni Sowhb., Inf. Oolite;
D, Phylloceras heterophyllum Sowb., Upper Lias; s,s, suture lines
7.
Section of Orthocerus, showing the septa (s,s) and siphuncle (si,si) (A);
portion of the exterior of Orthoceras annulatum Sowb.
8.
Ammonites (Cadoceras) subduevis Sowb., Kellaway's Rock, showing the marginal position of the siphuncle
9.
Cyclophorus siamensis Sowb., Siam
10.
Tridaena scapha Lam. (A);
Cardium enode Sowb, showing the inter-locking of the ventral margins
11.
Portion of the radula of Gadinia peruviana Sowb., Chili
12.
Portion of the radula of Chiton (Acanthopleura) springer Sowb., Andamans (A)
Portion of the radula of Dentalium entalis L., Clyde (B)
13.
Examples of degraded forms of radula:
A, Cantharus pagodus Reeve, Panama (nascent end); A' Same radula, central and front portion; B, Columbella varia, Sowb., Panama
14.
Portion of the radula of Eburna japonica Sowb., China
15.
Jaws of A, Triton australis Lam., Sydney; B, Ampullaria fasciata Reeve, Demerara; C, Culiostoma punctulatum Mart, New Zealand; D, Cyclophorus atramentarius Sowb., Sanghir
16.
Dorsal eyes of Chitonidae, showing the various forms of arrangement in the first and fourth valves of 1, 1a, Acanthropleura spinigera Sowb., E. Indies; 2,2a, Tonicia suevensis Reeve, Suez; 3, 3a, Acanthopleura granulata Gmel. W Indies; 4, 4a, Tonicia lineolata, Fremb., Chili
17.
Fissurella virescens Sowb, Panama, showing position of the branchiae; Br, branchiae; E, E, eyes; F, foot; M, mantle; T, T, tentacles
18.
Crepidula onyx Sowb., parasite on the operculum of Strombus galeatus Swains, Panama
19.
A, Neritina reticularis Sowb., Calcutta (brackish water); B, Helicina neritella Lam., Jamaida (land); C, Proserpina (Ceres) eolina Duel, Central America
20.
A, Cerithium columna Sowb. (marine).
B, Potamides microptera Kien (Brakish water).
C, Io spinosa Lea, one of the Pleurocerridae (fresh water)
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