98 BLUE CHALK MARL. 



culated dorsal ridge ; the commencement of the abdomen appears at the 

 base. 



35. " Fragments of the abdomen of two kinds of Astacidcs" Dr. 

 Leach. 



These are too imperfect to require any observation. 



Eemains of Fishes. 

 These occur so rarely, that the following are the only examples in my 

 possession. 



36. Scales of some unknown fish. 



37. A small vertebra. 



38. A tricuspid tooth ; resembling those of Squalus mustelus. 



Organic Remains of the Malm Rock of Western Sussex. 



I am unable to give any satisfactory account of the fossils of this bed ; 

 and none are enumerated in Mr. Hawkins' catalogue of the organic re- 

 mains of that division of the county. 



My friend, Mr. Chassereau of Brighton, discovered the culm or stem of 

 some arundinaceous plant in the limestone, near the Roman villa, at Big- 

 nor ; and also the impression of a coriaceous nut, perhaps of a species of 

 areca. 



In the same locaUty, white linear markings, resembling those of the 

 red marl at Norhngton, are very numerous between the laminae of the 

 malm rock ; are these the remains of algae ? of fuci ? or of corallines ? 



Near Amberley Castle, Mr. Chassereau observed ammonites and ino- 

 cerami ; and Mr. Hawkins has lately informed me, that some fine crabs 

 have been found in the grey Umestone of that parish. The fossil tree, 

 discovered by Mr. Hanley, has already been noticed. 



