CONCHOLOGY. 



Muki- 

 valves. 



■Ibus, 



svigstus 



Ijcicula- 



Lin. Trans, vol. viii. tab. 1. fig. 3. 



Found with the preceding species. Not common. 



5. Albus. Shell oblong, white, with eight valves a 

 little pointed at the dorsal elevation; minutely shagreen- 

 ed ; striated longitudinally at the sides, and obsoletely 

 transversely in the middle ; anterior valve large ; bor- 

 der finely but distinctly shagreened ; length a quarter 

 of an inch ; breadth one eighth. 



Lin. Trans, vol. viii. tab. 1, fig. 4. 



Found by Dr Pulteney at Poole in Dorsetshire. We 

 have taken it in Zetland, adhering to stones from deep 

 water. The Linna?an character, valvvla prima postice 

 emarginata, does not occur in our specimens. 



6. Lcevigntus. Shell with eight valves, elevated on 

 the back, oblong, reddish, with white stripes ; valves 

 regularly shagreened; anterior compartment striated 

 transversely ; border smooth, scarcely ciliated ; length 

 four tenths ; breadth two tenths. 



A new species found in Zetland along with Chiton 

 albus. 



7. Fascicularis. Shell oblong, ovate; valves eight; 

 . striated longitudinally on the back, and roughly sha- 

 greened on the sides ; border rough, surrounded with 

 tufts of white hairs, one at the junction of each valve, 

 six on the margin at the front, and two at the posterior 

 end, making twenty in number ; length five eighths of 

 an inch ; breadth above two eighths. 



Test. Brit. tab. 27. fig. 5. 

 Lin. Trans, vol. viii. tab. 1, fig. 1. 

 Found in several places in England. It occurs like- 

 wise in the Frith of Forth, and in Zetland. 



8. Ciinitus. Shell with seven valves, thick set with 

 short hairs. Length five eighths of an inch. 



Brit. Zoo/, tab. 36, fig. 1. 

 Inhabits the sea near Aberdeen, according to Mr 

 Pennant. Mr Boys is said to have found it "at Sand- 

 wich. It is a species involved in much obscurity. 



The Sabella? are usually described along with shells 

 in systems of Conchology. They possess cases which 

 are composed of sand or small shells agglutinated toge- 

 ther, and hence do not resemble the true Testacea, 

 whose shells are secreted from the body of the inhabi- 

 tant. For a description of the different species of Sa- 

 bellae, see the article Mollusca. 



TVular Having thus given a short description of the shells 



»eVa and ° f Britain ' we sha11 now exhibit a tabular view of the 



■fiea, genera and species which have been mentioned, and 



conclude with a few directions to the young concholo- 



gist, for collecting and preserving shells. 



ORDER I. UNIVALVES. 



DIVISION I. UNILOCULAR. 



SECT. I. ASTULIDIA. 

 Family I. EXPANDED. 

 Genus I. Patella. 



103 



t'nitus. 



A. 



1. Vulgata. 



2. Coerulea. 



3. Pellucida. 



4. Elongata. 



5. Parva. 



6. Elliptica. 



7. Distorta. 



8. Rota. 



B. 



9. Intorta. 



10. Lacustris. 



11. Oblonga. 



C. 



12. Antiquata. 



13. Hungarica. 



14. Militavis. 



D. 



15. Graeca. 



16. Apertura. 



17. Zetlandica. 



18. Marginata. 

 E. 



19- Fissura. 



F. 

 20. Chinensis.- 



Genera and 

 Species. 



Gen. II. Haliotis. 



1. Tuberculata. 

 Gen. III. Sigaretus. 



1. Haliotoidea. 



Family II. TUBULAR. 

 Gen. IV. Dentalium. 



1. Entalis. 



2. Dentalis. 



Gen. V. Cecum. 



1. Imperforatum. 



2. Trachea. 



Gen. VI. Serpula. 

 1. Vermicularis. 



Striatuluna. 

 Gadus. 



3. Glabrum, 



3. Serrulata. 



4. Tubularia. 



2. Triquetra, 



Family III. FLASK-SHAPED 

 Gen. VII. Lagena. 



1. Striata. 



2. Globosa. 



3. Lsevis. 



4. Marginata. 



5. Retorta. 



6. Perlucida. 



7. Urnae. 



8. Squamosa. 



Family IV. SPIRAL. 

 Gen. VIII. Spirorbis. 



A. 



1. Communis. 



2. Spirilium. 



3. Granulatus. 



4. Carinatus. 



5. Corrugatus. 



6. Comeus. 



Gen. IX. Planorbi9. 



1. Comeus. 



2. Complanatus. 



3. Carinatus. 



4. Vortex. 



5. Spirorbis. 



B. 



7. Heterostrophus. 



8. Sinistrorsus. 

 9- Minutus. 



10. Conicus. 



11. Lucidus. 



12. Reversus. 



6. Contortus. 



7. Albus. 



8. Cristatus. 



9. Fontanus. 

 10. Nautileus. 



SECT. II. STULIDIA. 

 Family I. TURRETED. 

 Tribe I. Canaliculated. 

 Gen. X. Buccinum. 



1. Undatum. 



2. Glaciale. 



3. Lapillus. 



4. Reticulatum. 



5. Macula. 



6. Ambiguum. 



7. Hepaticum. 



8. Bilineatum. 



9. Perdix. 



10. Lineatum. 



11 Cinctum. 



12 Minimum. 



13. Terrestre. 



14. Obtusulum. 



15. Breve. 

 16- Minutum. 



17. Laeve. 



18. Obtusissimunt. 



