482 EXPLANATION OF 



of the two branchial plumes. 5. Chiton asellus, and 5. a. its head, 

 seen in profile. 6. Chiton ruber. All from original drawings. 



Plate BB. — 1. Emarginula rosea. 2. An enlarged view of its head and 

 neighbouring parts seen from above ; and 3. the same seen late- 

 rally. 4. Puncturella noachina, seen sidewaj's. 5. The same from 

 below, and 6. its bead, 7. Fissurella reticulata. 8. Calyptrcea 

 sinensis, seen from below; 9. Its head; 10. Shell of the fry; 11. 

 Head and neck of the fry; 12. and 13. Tongue. All from original 

 drawings. 



Plate CC. — 1. Patella vulgata. 2. Emarginula crassa. 3. Haliotis 

 tuherculata. 4. and 4*. Trochus helicinus. 5. and 5*. Pileopsis 

 hutigaricii^, from a half-grown example. Figures 2, 4, and 5, are 

 - from drawings by Mr. Alder. 



Plate DD. — 1. Trochus cinerarius, and 1. a. its head and lobes (the 

 right lateral lobe should be simple-edged, not crenated). 2. T. 

 tmnidiis. 3. T. magus. 4. T. granulatus. 5. PhasianeUa pulliis, 

 and 5. a. its head : the second lateral filament should be shorter 

 than the others. Fig. 2 is by Mr. Alder. 



Plate EE. — 1. a. Trochus ziziphimis, from below; 1, b. the same, front 

 view; 1. c. its head and tentacles ; 1. d. a lateral filament ; 1. e. its 

 operculigerous lobe and tail; 1. f. the branchial plume; 1. g. 

 branchial lamellae very highly magnified. 2. a. Trochus alabastrum 

 (misprinted alahastrites) ; 2. b. its head, tentacles, lateral and 

 capital lobes, and the anterior portion of its foot. 



Plate FF. — 1. Scalaria Trevelyana, showing the head and siphonal 

 fold of mantle. 2. The same crawling. 3. Head and anterior por- 

 tion of the foot seen from above. 4. Chemnitzia fulvocincta, under 

 the name of rufa. 5. Head, &c. of C. scalaris. 6. C. rufescens. 

 7. EuUmella Scillce (named Chemnitzia MacAndrei, on plate). 8. 

 Odostomia spiralis. 9. and 10. Truncatella truncatula. 



Plate GG. — 1. Skenea planoi-his, and 1. a. the same seen crawling, so 

 as to show its operculigerous lobe. 2. Littorina rudis, var. patula; 

 2. a. its foot seen from below, 3. Head of Littorina Uttorea. 4. 

 and 4. a. Lacuna vincta. 5. Some stages of development of Lacuna 

 pcdlidula; and 5. a, ova of that species clustered on a fucus, both 

 from the drawings of Mr. Spcncc Bate. 



Plate HH. — 1. Neritina fiuviatilis. 2, Paludina vivipara; 2. a, its 

 head and neck-lobes. 3. Bithinia tentaculata; and 3. a. its head 

 and neck-lobes. 4. B. Leachii. 5, Valvata cristata; and 5. a. its 

 head and front of foot, 6. Assiminea Grayana. All from original 

 drawings, 



Plate II, — 1. Trichotropis borealis, 2. and 2. a, Cerithium reticula- 

 tum. 3, Aporrhais pes-pclccani ; and 3. a. its foot. 4. and 4. a. 

 TurriteUa communis. All from drawings by Mr. Alder. 



