MOORE ABNORMAL SECONDARY DEPOSITS. 523 



these, Moorea ohtusa, Jones, and Cytliere curva, being new and 

 peculiar to the deposit. The others are considered to be of Car- 

 boniferoiisLimestone species. Two of these, Cythere fahulina and 

 Bairdia pleheia, not only occur in the Charter House Mine, but I 

 have found them also in the Allenhead and other lead-mines of the 

 North of England. 



I have before expressed ray belief in the recurrence of generic 

 and specific forms under favourable circumstances after long in- 

 tervals ; and such I believe to be the case with the above. A de- 

 rived and redeposited shell usually presents a condition which a 

 practised eye readily detects when compared with the later fauna 

 with which it may be associated. In this instance they have been 

 washed out by myself from the soft matrix of the Liassic blocks, are 

 not in the least abraded, the other remains found with them being, 

 except in veiy rare instances, undoubtedly Liassic. 



Circumstances which were so favourable to the life of the Zoo- 

 phyta might have been considered equally so to the Bryozoa ; but 

 examples are very rare, and appear confined to what I suppose to 

 be two species of Neuropora'l 



The Brachiopoda as a family are also very feebly .represented ; 

 I have hitherto detected only the genera RhynclionelJa, Terebratula, 

 ThecicUum, Crania, and Zellania. Of the first I possess from Bro- 

 castle but two specimens of R. variabilis, one of them being from 

 the Pentacrinital limestone ; the Terehratidce are two very young 

 specimens of T. punctata ? The TJiecididce, on the contrary, are very 

 abundant and may be seen in almost every block ; these are of thi^ee 

 species, namely T. Moorei, Dav., T. rusticum, Moore, and T. trian- 

 gidare, D'Orb. The two former species I have found in the Charter 

 House Mine and in the Ammonites^Bucklandi beds of the Lower 

 Lias. The Zellanioi at Brocastle are also not uncommon ; and though 

 they present considerable variety in their form, I am unable to 

 distinguish them from Z. Davidsonii, Moore, of the Inferior Oolite. 

 We have therefore again, with the latter shells, a recurrence of 

 specific forms, through the Lower Lias into and through the Mid- 

 dle and Upper Lias, and, with the latter shell, even into the Inferior 

 Oolite. It is curious to observe that, though the latter genus has 

 so extended a range, and is so wide-spread, no other author appears 

 to have yet recognized it. 



The Lamellibranchiata to this4;ime have yielded forty-nine species, 

 without including some doubtful and fragmentarj' forms ; and no 

 doubt the list may be still increased. In general, however, they 

 are imperfect, and in single valves, and are most commonly, either 

 wholly or in part, enclosed in the matrix, from which they cannot 

 easily be extricated. GrypTicBa incurva is one of the most abundant 

 bivalves at Brocastle. 



Unlike the former shells, those of the Gasteropoda are usually in 

 a most beautiful state of preservation, and retain to a considerable 

 extent their ornamentation. It is rarely that they can be recognized 

 in the matrix of the stone itself in this section ; they are, rather, 

 usually attached to its outer surface, or to the hollows presented by 



