FOSSIL MOLLUSC A BIVALVES AND UNIVALVES. 247 



little botany an excellent help-meet to fossil-hunting, 

 for they can both be pursued together. Nowhere is 

 this twofold pursuit more delightful than along the 

 coasts of North Devon. At the Little Hangman, the 

 rocks in places are fossiliferous, although only to be 

 met with as casts. Here is that singular and easily 

 recognized bivalve Megalodon, and large mussel 

 Natica, etc. The quarry at Hagginton Hill abounds 

 with fossils, and the pedestrian will frequently meet 

 with them as he hammers his way along from Ilfra- 

 combe to Combe Martin. At Pilton and Barnstaple 

 the Upper Devonian rocks yield abundance of Avicula, 

 Ciicculea, Modiola, etc. Perhaps the richest locality 

 for obtaining these are the rocks on the summit of 

 the hill at Baggy Point : Braunton, Marwood, and 

 other localities, also yield them. Top Orchard quarry 

 has long been a recognized Devonian hunting-ground. 



The Devonian limestone also contains fossil mol- 

 lusca. The ancestors of the common cockle (Car- 

 diuiri] first appear here. Loxonema Murchisonia, etc., 

 are found in the limestone at Plymouth, Chudleigh, 

 Newton Abbot, and elsewhere. 



Fossil fresh-water mussels, nearly allied to the 

 common swan mussels of our rivers, are in abundance 

 in the Old Red Strata of Kiltorcan, in Ireland. The 

 species (Anodonta Jiikesii) was named after the late 

 director of the Irish geological survey. This fossil 

 bivalve is also found in strata of similar age in 

 Scotland. 



