CONCHOLOGY. 



89 



Bivalves, trically ; beak small, and placed nearest to the smaller 

 T"""' end, to which it turns ; hinge furnished with a hori- 

 zontal tooth, and a minute erect tootli ; length three- 

 eighths of an inch, breadth six-eighths. 

 Test. Brit. tab. 26, fig. 3. 

 Found by Mr Laskey on the shore at Dunbar. Mr 

 Montagu has likewise found a single valve on the coast 

 of Devon. 

 Substriata. 8. Substriata. Shell sub-ovate, white, sub-pellucid, 

 wrought with distant, obsolete, elevated, longitudinal 

 striae ; beak prominent ; hinge furnished with a slight 

 projection inwards, margined so as to form a cavity. 



Taken by deep dredging among Corallines, on the 

 coast of Devon, by Mr Montagu. 



Genus XXVIII. Solen. 



XXVI II. Sfiell equivalved, transversely elongated, gaping on each 

 SdiN. side; the hinge teeth single in each valve, or double in 

 one valve ; beaks very small ; the ligament external, and 

 most frequently near to the extremity of the shell. 



Siliqua *• Siliqua. Shell straight, sub-cylindric, truncated 



at one end, rounded at the other ; striated transverse- 

 ly and then longitudinally towards the back ; a diago- 

 nal line from the hinge to the opposite end marks 

 the turn of the longitudinal striae; teeth in one valve 

 single, with a remote lateral lamina ; in the other valve 

 two teeth, and a lateral inclined one ; length an inch, 

 breadth eight inches. 



Brit. Zool. tab. 45, fig. 20. 

 Common on the sandy shores buried to the depth 

 of a foot or more near low water mark. It is an article 

 of food in many places. 

 Xovacula 2. Novacula. Shell resembling the last, except the 

 hinge, in which it differs ; the teeth are two in number, 

 one on each valve, strong, blunt, and curved, and hook 

 into each other when the shell is closed ; no lateral la- 

 minae ; length one inch, breadth eight inches. 

 Test. Brit, page 47. 

 Found near Laugharne, Caermarthenshire, by Mr 

 Montagu. 

 Ensis, 3. Ensis. Shell sub-cylindrical, arcuated ; hinge, with 



a single tooth and a lateral lamina in one valve, which 

 lock into two teeth and double laminae" in the opposite 

 valve ; length three quarters of an inch, breadth be- 

 tween five and six inches. 



Brit. Zool. tab. 45, fig. 22. 

 Common in similar situations, as the S. siliqua. ' 

 Vacina *• V a gi na - Shell cylindric, straight, rather trunca- 



ted at both ends ; the end next the hinge a little reflec- 

 ted ; striated transversely, each stria running longitu- 

 dinally across the shell, but not marked with a diago- 

 nal line ; hinge close to one end, furnished with a 

 single small compressed tooth in each valve, which lie 

 by the side of each other when closed; length one 

 inch, breadth five inches. 



Brit. Zool. tab. 46, fig. 21. 

 Brit. Shells, tab. 110. S. marginatus. 

 This shell was first noticed by Pennant from Angle- 

 sea. Found at Weymouth by Dr Pulteney, and near 

 Laugharne, Caermarthenshire, and at Kingsbridge, De- 

 vonshire, by Mr Montagu. 

 Pellucidus, 5. Pellucidus. Shell oblong, sub-arcuated, pellucid, 

 fragile, compressed, and rounded at each end ; hinge 

 near to one end, furnished with a single small tooth in 

 one valve, locking into two in the opposite, with a la- 

 teral process in each; length a quarter of an inch, 

 breadth an inch and a quarter. 



Brit. Zool, tab. 46, fig. 23. 



VOL. VII. PART I. 



FragiliS'i 



Minu'.us, 



First described by Pennant from Anglcsea. Found Bivalves. 

 in Cornwall, Kent, and Devon, by Mr Montagu. It is """"V""" ' 

 common on Portobello sands near Edinburgh. 



6. Legumen. Shell straight, oblong, pellucid, thin, Legumeu, 

 of a white colour ; hinge near the middle, and furnish- 

 ed with two small teeth in one valve, receiving a single 



one from the opposite ; length an inch, breadth four 

 inches. 



Brit. Zool. tab. 46, fig. 24. 



Brit. Shells, tab. 53. 

 On the English shores, but not common. 



7. Fragilis. Shell thin, pellucid, fragile, glossy, 

 white, somewhat depressed in the middle from the hinge 

 to the opposite margin, oblong, rounded at both ends ; 

 hinge near the middle, furnished with a small subulate 

 tooth in one valve, in the other two, one of which is 

 subulate, the other broad. 



Pult. Dorset, tab. 5, fig. 5. 

 Found on Studland beach by Dr Pulteney, at Wey- 

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



8. Anliquatus. Shell thin, subpellucid, wrought with Antiqua- 

 fine concentric striae, ends rounded, and gaping ; hinge tus > 

 placed near the centre, with a single tooth in one valve, 

 locking in between two in the opposite ; these are erect, 



and project beyond the margin; length one inch, 

 breadth two inches. 



Brit. Shells, tab. 114. 



Brit. Zool. tab. 46, fig. 25. S. cultellus. 

 Mr Pennant first gave this species as a British shell 

 from Weymouth. It has occurred to us in Zetland. 



9. Minulus. Shell opake, whitish, rugose or wrink- 

 led transversely, sub-oval, truncated at one end near the 

 hinge ; valves dissimilar, each furnished with two rows 

 of spines from the beak to the larger end; hinge teeth 

 two in one valve, and one in another, with a small ca- 

 vity, minute ; length half an inch, breadth upwards of 

 an inch. 



Test. Brit. tab. 1, fig. 4. 

 This species was observed by Cordiner in the Mur- 

 ray Frith. Mr Montagu has found it burrowed in lime- 

 stone at Plymouth. In Scotland, it is common among 

 the roots of fuci. 



10. Vespertinus. Shell ovate, depressed, marked with Vesperti- 

 concentric striae ; beak nearly central, small ; teeth two uus > 



in one valve, and one in another, erect, and likewise a 

 strong projecting lamina in each ; length an inch and 

 quarter, breadth two inches and a half. 



Brit. Zool. tab. 47, fig. 27. Tellina depressa. 



Brit. Shells, tab. 41, fig. 2. 

 First figured by Pennant. Found on the Dorset and 

 Devon coasts. Mr Laskey found it at Dunbar. 



11. Squamosus. Shell flat, pellucid, thin, white, of Squamosus. 

 a sub-orbicular shape, minutely punctured ; beak small, 

 pointed, central ; teeth two in each valve, double ; 



length three-eighths of an inch, breadth half an inch. 

 Test. Brit, page 565. 

 This species has been found only by Mr Montagu in 

 sand, from Salcomb bay, Devonshire. 



Genus XXIX. Tellina. 



Shell equivalved, orbicular or transverse, with an irre- XXIX. 

 gular fold on the anterior part ; hinge with one or two Teilina. 

 teeth, and remote lateral teeth. 



Obs. This genus in the Linnaean system, is in great 

 confusion. The French conchologists, with much pro- 

 priety, have removed the Tellina cornea of Lin. and its 

 congeners into a new genus, which they denominate 

 Cyclas. Mr Montagu has likewise separated these shells 



