CONCHOLOGY. 



85 



nearly the whole length of the shell, dilated at the base; 

 inner lip thickened, smooth, white ; length two-tenths. 



Test. Brit. tab. 7. fig. 3. 



Ver\ 



On the English coast frequent, very common in 

 the Forth about Bo-ness. 

 Flexilis, 15. Flexilis. Shell pellucid, horn-coloured ; apex 



white and opake, with a one-turned spire. Length 

 half an inch. 



Mem. Wer. Soc. vol. 1. tab. 8. fig. 6. 

 Found by Mr Laskey at Dunbar. Probably belongs 

 to the genus Sigaretus. 



B. Sinistral. 



Fontinal:?, 16. Fontinalis. Shell glossy, pellucid, horn-coloured, 

 the body whorl large, the others very small ; apex 

 blunt ; mouth oblong ; length half an inch, breadth a 

 quarter. 



Lin. Traits, vol. 8. tab. 4. fig. 1. 

 In stagnant pools in England and Scotland common, 

 fcvalis 17. liivalis. Shell ovate, pellucid, with five spires, 



with an acute apex ; mouth ovate oblong ; length half 

 an inch. 



Lin. Trans, vol. viii. tab. 4. fig. 2. 

 First discovered by Mr James Hay in Hampshire. 

 It has been found by Dr Leach in Duddingstone Loch 

 near Edinburgh. 

 Hypno- 18. Hypnorum. Shell with five or six taper, smooth, 



rum. glossy spires ; the body whorl half the length of the 



• shell ; mouth narrow at the top, spreading a little at 

 the base ; outer lip extremely thin; pillar, lip a little 

 thickened; length five-eighths of an inch. , 

 I An. Trans, vol. viii. tab. 4. fig. 3. 

 Found in ponds and ditches in England. 



DIVISION II. MULTILOCULAR. 



The shells included in this Division are more compli- 

 cated in their structure than those of the preceding 

 species. They possess a cavity divided into compart- 

 ments with a pipe of communication. All the British 

 species are minute, and require the aid of the micros- 

 cope for their examination. Although the species 

 Which are found in a recent state on our shores are 

 Very small, many species of a large size occur in the 

 mineral strata, and indicate that the testacea of a form- 

 er period of the earth's existence differed materially 

 from the species which now exist. To this division of 

 shells only four genera belong, the Nautilus, Ortho- 

 ceres, Spirolina. and Miliola. 



Genus XXII. Nautilus. 

 XX I r. g] ie ii S pi ra l } discoid; cavity divided into comparl- 



' nienis by means of transverse septa or parti: ions, concave 

 outward, and perforated by a tube. 



Obs. This genus will, for the present, include se- 

 veral species belonging to other genera in the system 

 of Lamarck. In a general system, the Gallican genera 

 are unexceptionable, but in a limited description of spe- 

 cies, its application would be attended with considera- 

 ble inconvenience. 

 Ssccarii, i. Beccarii. Shell white, pellucid, with four or five 



volutions, with deep sulcated joints, ten in the first spire ; 

 above convex, beneath fiat, and the markings less dis- 

 tinct ; mouth turned upwards, not clasping the body 

 whorl ; syphon situated at the anterior side, close to the 

 second whorl. 



Test. Min. Rnr tab. ?,. fig. 65. 



Test. Brit. tab. 18. fig. 4. 



Frequent on the British shores, residing in alga; and Univalves, 

 shells. - ~ \ 



2. Beccarii pervcrsits. In every respect resembling Beccarii 

 the last, with the exception that the spires in this are perver,uf, 

 reversed, or the shell is sinistral. 



Tfst. Min. Rar. tab. 3. fig. 64. 

 More frequent than the preceding species. 



3. Crispiis. Shell with lateral whorls, furnished Crispus, 

 with about twenty flexuous crenated joints in the exte- 

 rior whorl, marked by elevated striae ; outer edge cari- 

 nated ; inner whorl concealed ; mouth clasping the bo- 

 dy, semicordate, and furnished with a small perfora- 

 tion or syphon. 



Test. Brit. tab. 18. fig. 5. 

 Test. Min. Rar. tab. 3. fig. 65. 

 Frequent on the English shores. 



4. Lcevigatidus. Shell pale, ferruginous, opake, Laevigata- 

 smooth, with about ten visible flexuous rays of a deeper lus > 

 colour which mark the septa; both sides convex de- 

 clining to a marginal edge ; mouth surrounded with a 

 margin forming a triangle ; syphon near the exterior 



angle. 



Test. Mm. Rar. tab. 3. fig. 67. 



Test. Brit. tab. 18. fig. 7- 8. 

 Found by Mr Walker at Sandwich and Sea Salter, 

 but not common. 



5. Calcar. Shell smooth, with six joints on the bo- Calcar, 

 dy whorl, marked by as many flexuous elevated striae 

 radiating from the centre ; back strongly carinated ; 



both sides equally convex ; interior volutions lost after 

 entering the aperture, which is semicordate, clasping 

 the body equally on both sides, and furnished with a 

 small perforation. 



Test. Brit. tab. 15. fig. 4. 

 Found by Mr Montagu on the English coast. , 



6. Lobatulus. Shell roundish or oblong ; above con- L °' iat » as > 

 vex, with six or seven lobes, beneath flat ; the interior 

 volution only marked by one or two small elevations^ 



and frequently not visible; aperture minutely small;, 

 diameter about a line. 



Test. Min. Rar. tab. 3. fig. 7l. 

 Found in Kent and Devonshire. Sessile adhering to 

 Alga?. 



7. Concameratus. Shell sub-orbicular, compressed, Concame- 

 flat beneath, slightly convex above, with three irregu- r atus } 

 lar volutions and numerous dissimilar concamerations ; 



the exterior whorl has about nine glossy tumid cells of 

 unequal size ; diameter half a line. 

 Test. Brit. sup. page 16'8 

 Found by Mr .Montagu in similar situations with the 

 former. 



8. Depressulus. Shell semi-pellucid, glossy, white, de- Depress*?. - 

 pressed, with about nine visible septa, radiating from 1'-", 



the centre in curved lines marked by their opacity; 

 sides similar ; the mouth is somewhat like N. calcar, but 

 does not clasp the body so much. 



Test. Min. Rar. tab. 3. fig. 68. . 



Test. Brit. tab. 18. fig. 9. 

 Found at Reculver, ver)^ rare, Mr Walker. 



9. Umiilicatii/u,: Shell compressed, sub-pellucid, u : 1,blll c^ 

 white, with nine or ten raised joints; the anterior end '"?•■' 



or mouth clasping the body ; whorl nearly equal, with- 

 in which any interior volution is lost. 

 Test. Brit. tab. 18. fig. 1. 

 Found at Sandwich by Mr Walker, and at Kings- 

 bridge by Mr Montagu. 



10. Crassuhts. Shell spiral, strong, opake, pale rS£SU '*'" 

 brown, with numerous close-set elevated joints ; sides 

 compressed, similar, with a central cavity, shewing part 



