CONCHOLOGY. 



71 



Univalves, oval, ending in an entire straight or slightly ascending 



*""T^*' canal. 



Ohs. This genus is nearly allied to the former, and 

 is principally distinguished from it by the greater length 

 of the canal. We have, for the present, formed this 

 genus into three families. 



A. Canal short, spires furnished with foliated tu- 

 bercles. 



Erinaceus, 1. Erinaccus. Shell strong angulated, with six or 

 seven spires, terminating in a fine point; each volution 

 is furnished with six or seven rugged prominent longi- 

 tudinal ribs ; canal tubular ; length an inch and three 

 quarters, and nearly an inch wide. 

 Brit. Zoo!, tab. 76. fig. 95. 

 Brit. Shells, tab. 35. 

 Frequent on the English and Scottish shores. 



B. Canal short, shell tapering. 



2. Subulatus. Shell slender, white, with about fif- 

 Subulatus, teen S pj res a ]j tt | e e l eva ted, defined by a purplish brown 

 line, each wrought with two rows of beads divided by 

 a depressed line ; mouth small, canal short, and turn- 

 ing to the left ; base smooth ; length three-eighths of 

 an inch. 



Test. Brit tab. 30. fig. 6. 

 Found amongst sea-sand in the sound of Mull 

 FiKcatu? 3. Fuscatus. Shell with ten or twelve tuberculated 



spires, tapering to a fine point; volutions wrought with 

 three or four series of crenulated striae between the 

 tuberculated spiral ridges ; mouth small, oval, ending 

 in a slight canal. 



Brit. Zool. tab. 83. fig. 3. 

 Found by Mr Pennant on the coast of Northumber- 

 land, by Mr Bryer at Weymouth, and by Mr Laskey 

 at Jura. 

 . 4. Reticulalus. Shell with eleven or twelve reticula- 



ted volutions, strong, slender, tapering, four spiral rid- 

 ges on each volution, crossed with longitudinal furrows; 

 mouth oval, angulated at the upper part ; length five- 

 eighths of an inch. 



Pult. Dorset, tab. 14. fig. 13. 

 Not uncommon on the English coast, also on the 

 west coast of Scotland. 

 :rcu- 5. Tubercularis. Shell with nine or ten slender, ta- 

 per, tuberculated spires, separated only by a slight de- 

 pression, with three series of tubercles of equal size on 

 each volution ; length a quarter of an inch. 

 Test. Brit. p. 270. 

 Found in Devonshire by Mr Montagu, at Sandwich 

 by Mr Boys, and at Dunbar by Mr Laskey. 

 W6U3, 6. Adversns. Spires sinistral, tuberculated, tapering 

 to a fine point ; volutions scarcely defined by the sepa- 

 rating line, with three series of tubercles on each ; 

 mouth oval ; ending in a straight canal ; length three- 

 eighths of an inch. 



Test. Mm. Rar. tab. 2. 

 Brit. Shells, tab. 15. 

 Found by Mr Walker at Sandwich, Miss Pocock in 

 Cornwall, Mr Montagu in Devon, and by Mr Laskey 

 at Dunbar. 



C. Canal produced. 



iracilis, 7. Gracilis. Shell with thirteen ribs, purplish brown 



at the junction of the spires, with a white band round 

 the middle of the body whorl ; volutions with twelve 



Univa'vts 



fig. 48. 



ribs, separated at the juncture of each spire by a flat 

 space, striated across. " . v 



Ted. Brit. tab. 15. fig. 5. 

 Found at Biddeford Bay by Mr Montagu, at Port- 

 land by Mr Bryer, and at Dunbar by Mr Laskey. 



8. Accinclus. Shell with six or seven costated volu- Accinctus, 

 tions; the ribs are slightly angulated; whorls with spi- 

 ral striae ; canal short ; lip entire at the upper angle ; 



length four lines. 



Mem. Wernerinn Soc. vol. i. tab. 8. fig. 14. 

 In the Frith of Forth by Mr Laskey. 



9. Atlenwitus. Shell with eight spires, destitute of Attenuate, 

 striae, and furnished with nine strong equidistant ribs ; 

 volutions scarcely raised ; mouth narrow ; outer lip 

 thickened at the back with a rib, inner lip plain; length 



half an inch. 



Test. Brit. tab. 9- fig- 6. 

 Found at Falmouth harbour and Biddeford bay by 

 Mr Montagu. 



10. Nebula. Shell with eight taper costated spires, Nebula, 

 terminating in a sharp point, finely reticulated ; volu- 

 tions scarcely separated ; mouth narrow, oblong ; outer 



lip sharp, inner lip replicate ; upwards of half an inch 

 in length. 



Test. Brit. tab. 15. fig. 6. 

 Found by Mr Montagu on the English coast. 



11. Cosfatus. Shell with six taper volutions; with CtJstatm, 

 eight or nine elevated ribs, without striae ; mouth nar- 

 row ; outer lip usually thickened by a rib at the back, 

 margin thin ; length three-tenths of an inch. 



Brit. Shells, tab. 9.1. 

 On the English coast not common, Mr Laskey has 

 found it at Dunbar, and we have it from Zetland. 



12. Pmximus. Shell thick, white, with six strongly 

 costated spires; apex moderately pointed; mouth ovate, 

 oblong ; outer lip broad, reflexed ; canal short, and ra- 

 ther spreading at the end ; length about half an inch. 



Test. Brit. tab. 30. fig. 8. 

 Found by Mr Laskey at Dunbar. 



13. Septangularis. Shell with eight strong, smooth, 

 taper whorls, with seven longitudinal ridges, that run 

 the whole length of the shell; mouth oblong, oval; 

 outer lip sharp at the edge; length five-eighths of an inch. 



Brit. Shells, tab. 179- fig- 4. 

 Test Brit. tab. 9. fig. 5. 

 Found at Falmouth and Salcomb bay by Mr Monta- 

 gu, and at Weymouth by Mr Bryer. 



14. Turricula. Shell with seven taper ribbed spires Tcrricula, 

 terminating in a fine point, and striated transversely ; 

 volutions rise perpendicularly above one another, the 



top of each being almost flat, and the ribs at that part 

 are angulated; mouth narrow ; length three quarters of 

 an inch. 



Test. Brit. tab. 9. fig. 1. 

 In England and Scotland not uncommon. 



15. Rufus. Shell with six taper-ribbed spires of a Rufus 

 pale rufous brown colour; whorls furnished with about 

 sixteen small ribs striated across ; mouth narrow ; ca- 

 nal short ; pillar lip smooth ; outer lip smooth, rarely 

 thickened by a rib ; length three-tenths of an inch. 



Test Brit. p. 263. 

 On the English shores by Mr Montagu, at Dunbar 

 by Mr Laskey. 



16. Gyrinus. Shell strong, short, conic, with four Gyrinus, 

 brown whorls regularly covered with dark chesnut co- 

 loured tubercles, eight in a row on the body whorl, and 



three on the succeeding volution ; length about a quar- 

 ter of an inch. 



3 



Proximus, 



Septangu- 

 laris, 



