SULCOCAYA. 
213 
-\jTiNirrEs. 
This species may be conveniently taken as the type of the genus, 
although S. sulcata was the first in oixler of cl’Orbigny’s three 
species ; but that form was not so well figured, and the fragment 
may have been much worn. 
D’Orbigny’s figures do not appear very satisfactory, so that the 
specific determination of the English specimens is open to doubt. 
LIST OF SPECBIEXS. 
D. 714. A branched trairment (on slide). ‘Middle Chalk. Chatham. Vine 
Coll., Xo. 4 SIg. Recorded as Sulcocara sulcata? Vine: Rep. 
Brit. Assoc. 1S92, p. 310. Figd. Xo. 21. 
B. 3971. Two fngments on slide . Middle Chalk. Chatham. Gamble 
Coll. 
B. 3974. Three fraqrraents (on slide). Middle Chalk. Chatham. Gamble 
CoU. Figd. Xo. 22. 
B. 2706. One fragment (on sUde). Middle Chalk. Chatham. Vine CoU. 
rB. 411. A worn fragment (on slide). Middle Chalk. Chatham. Gamble 
Coll. 
B. 4487. A free branched fragment. Middle Chalk. Chatham. Vine CoU. 
2. Sulcocava gracilis (d’Orbigny), 1853-4. 
Synonymy. 
Laterocaca gracilis, d’Orbigny. lS-53-4. Bry. Cret. p. 1023, pi. 789, figs. 17-20. 
,, „ Pergeus, 1890. Rension, p. 368. 
Diagnosis. 
Zoarium of subcylindrical or slightly compressed branches, 
which are tlivided dichotomously ; apertures circular, small, 
surrounded by a low, bead-like peristome. The apeitures ai’e 
in regular transverse series, without any impaired median row. 
Dimensions. 
Diameter of branch ... .. ... 1 mm. 
Diameter of zooecia ... ... ... *25 ,, 
Diameter of aperture -1--15 „ 
Distribetion. 
Engl.an'd : 
MidiUe Chalk : Chatham. 
Foreign : 
Senonian : Meudon, near Paiis. 
