LOWER CHALK - CHARACTERISTIC FOSSILS. 
29 
There are also species of Scalaria, Fusus , Natica, Turbo, Trochus, 
Turritella, and Valuta ; the occurrence of the Valuta being interest¬ 
ing as the earliest recorded appearance of the genus in England. 
Lamellibranchiata are, as usual, common fossils. Several species, 
such as Ostrea from , 0. vesicularis, Pecten orbicularis , P. ( Neithea ) 
quinquecostatus , Lima globosa (Fig. 18), Aucellina gryphceoides , 
and Plicatula pectinoides, range up from the Selbornian. 
Species more distinctive of the Lower Chalk are the following : — 
Cuculloea maiheana, d’Orb. 
Exogyra haliotoidea, Sow. 
Inoceramus latus, d,Orb. non Mant. (Fig. 17). 
„ cuneiformis, d’Orb. 
,, striatus, Sow. 
Lima aspera, Mant. (Fig. 19.) 
Pecten Beaveri, Sow. (ranges up). 
,, elongatus, Lam. (= cretosus, Goldf.) 
Badiolites Mortoni, Mant. (ranges up). 
Pholadomya decussata, Phil. 
TJnicardium ringmeriense, Mant. 
Brachiopoda.—T hese also form an important element in the 
fauna of the Lower Chalk, and the following are of common 
occurrence : — 
Kingena lima, Defr. (ranges from Gault). 
Rhynchonella Martini, Mant. 
,, mantelliana, Sow. (Fig. 13). 
„ grasiana, d’Orb. 
Terebratula semiglobosa, Sow. (ranges upward). 
' ,, biplicata Sow. (ranges from Gault). 
„ sulcifera, Morris. 
„ squamosa, Soiv. 
Terebratulina triangularis, Eth. 
„ nodulosa, Eth. 
„ striata, Wahl, (ranges upward). 
Bryozoa are not generally common in the Lower Chalk, though 
some adherent species may be found on the larger shells, but in the 
arenaceous limestones of Devon they are abundant, though few of 
them have yet been identified or named. 
Crustacea. — Of Decapodous Crustacea the lobster-like Enoplo- 
clytia are the commonest (E. brevimana and E. sussexensis ). 
Palcega Carteri has been found at several localities, but Crabs 
are rare. Cirripedes are not uncommon, Pollicipes glaber and 
Scalpellum trilineatum being those most usually met with. * 
Annelida.—S pecies of Serpula are common, S, annulata and 
S. antiquata often occurring, but S. umbonata (see Fig. 22) is the 
species most characteristic of the Lower Chalk, 
