MYA. Q5 



at one end, but closed at the other. The exterior sur- 

 face is striated both longitudinally and transversely, 

 which gives it a reticulated appearance ; the mouth is 

 round and has a thick lip ; the hinge has a strong 

 spoon-shaped tooth ; the shell is of a white colour. 

 It is rarely found in Guinea, but frequently on the 

 African shore ; abundantly, says Adanson, at the mouth 

 of the Niger. 



GLOBULAR GAPER. 

 PL 24. /. 4, 5, 6. Mrs. Mawe. 



7. Mya globosa. M. testa suborbiculari, globosa, Mans, decussation 

 striata ; cardinis dente cochleariformi. 



Shell of a roundish shape, globular, gaping, with decussated striae ; 

 hinge with a spoon-shaped tooth. 



There is a strong general resemblance between this 

 shell and the preceding ; but, upon inspection, the spe- 

 cific difference is readily observed, the M. anatina 

 being decussated all over, while the M. globosa has 

 but little more than half its surface covered with lon- 

 gitudinal striae. The thick lip is also wanting, the 

 mouth of the M. globosa terminating in a sharp reflex 

 margin. The shell has a spoon-shaped tooth; it is 

 very thin, and the striae may be plainly seen on the 

 inside. 



ARCTIC GAPER. 



8. Mya arctica. M. testa striata ; valvis carinis duabus spinulosis; 

 cardine edentulo. Linn. Gmel. p. 3220. Mull. Zcol. Dan. Prodr. 

 2962. 



Shell striated; valves with two somewhat spinous ridges; hinge toothless. 

 Mya testa striata; valvis carinis duabus spinulosis, scepe obsoleiis ; car- 

 dine obsolete dentato. Fabr. Fn. Groenl. p. 407. N. 408. 



This shell is the size of a bean, about an inch and a 



