153 



anterior, which is slightly truncated, and notched, with 

 a small pointed apex, placed very near the posterior 

 margin, and inclined backwards, to which may be 

 added, that in appearance it somewhat resembles a sin- 

 gle valve of the Lingula anatina, but having both its 

 extremities nearly similar; the interior exhibits very 

 strong callous muscular impressions, which are in some 

 species marked with a blood-red color. It is com- 

 monly called the Duck's-bill Limpet by English col 

 lectors. 

 Parmophora australis Parmophora brevicula 

 Parmophora granulata. 

 [There is also one fossil species.] 



EMARGINULA. 



patella fissura. — Linn. 



Mawes Linnceus, plate 32, Jig. 1. 



This is another of Lamarck's divisions of the G. Pa- 

 tella of Linnaeus. The shell is conical, more or lesse le- 

 vated, and inclining to the anterior side, which is al- 

 ways the least, and opposite to the slit or fissure, ele- 

 gantly cancellated with longitudinal ribs and trans- 



