16 



CONCHY LI A— DITHYR A. 2. 



dorsalis. 

 3. 



uaua. 

 4. 



Teredo valvis postic^ rotimdatis inaurictilatis clausis, costd 



loHgitudinali interna. 

 Shell with the valves rounded without auricles and closed behind, 



furnished with a longitudinal rib on the inside. 

 Tab. nost. 2, fig. 4 and 5. 

 Teredo dorsalis. Turton, Conch. Diet. p. 185. 

 Mus. nost. From a piece of wood in Torbay. 



Shell less than the T.'navalis, and is distinguished by the want of 

 the reflected ear-shaped processes on the hinder side, Avhere the 

 end is plain and rounded ; by the valves closing together at that 

 part; and by the longitudinal jointed rib on the ins de of the 

 valves, with a corresponding groove on the outside. On the margin 

 is a raised curved process in one valve and a small slightly cloven 

 one in the other. 



From the circumstance of the valves being enabled to close 

 together at the hinder end, we doubt if it can be furnished with a 

 tube. It merits a better investigation than the few specimens we 

 possess can give it. 



Teredo valvis i^ostich rotunclaiis inavriculatis, margine cardinali 



dente conic o valido. 

 Shell with the valves rounded and without auricles behind, a 



strong conic tooth on the margin above he teeth. 

 Tab. nost. 2, fig. 6 and 7. 

 Mus. nost. From apiece of wood in Torbay. 



Shell hardly the eighth of an inch in diameter; something 

 resembling the young of Teredo dorsalis ; but the valves are des- 

 titute of the jointed internal longitudinal rib. The specimens we 



