482 EXPLANATION OF 



of the two branchial plumes. 5. Chiton ascUas, 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. PunctureUa noachina, seen sideways. 5. The same from 

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

 sine^ms, 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 

 tuberculata. 4. and 4*. Trochus helicinus. 5, and 5*. Pilcopsis 

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

 from drawings by Mr. Alder. 



Plate DD. — 1. Trochvs einerarius, and 1. a. its head and lobes (the 

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

 tumichis. 3. T. magus. 4. T. granulatxis. 5. Phasianella ptdlus, 

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

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



Plate P^E. — 1. a. Trochus ziziphinus, 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 alahastrum 

 (misprinted alabastrites) ; 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 riifa. 5. Head, &c. of C. scalaris. 6. C. rufescens. 

 7. Eulimella SciUce (named Chemnitzia MacAndrei, on plate). 8. 

 Odostomia spiralis. 9. and 10. Tnmcatella trwncatula. 



Plate GG. — 1. Skenea plaaorbis, and 1. a. the same seen crawling, so 

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

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

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

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

 from the drawings of Mr. Spence Bate. 



I'late HH. — 1. Neritina fluviatilis. 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. Cerithiurn reticula- 

 tum. 3. Aporrliais pes-pclecani ; and 3. a. its foot. 4. and 4. a. 

 Turritella communis. All from drawings by Mr. Alder. 



