SIPHOXIOTYPHLUS. 
277 
Figuhes. 
PI. XII. Fig. Qa. Part of longitudinal section, x 10 dia. 
Middle Chalk : Chatham. Tine Coll. D. 703. 
PI. XII. Fig. 6i. Upper part of a zoarium, of ^vhich the lower 
part has regularly pinnate apertures and a thin selvage, X 10 dia. 
Upper Chalk : Zone of Belemnitella mucronata. Clarendon, near 
Salisbur}'. Gamble Coll. D. 4324. 
LIST OF SPECIMEXS. 
D. 2944. 
D. 4324. 
D. 703. 
D. 702. 
D. 2654. 
The type-speciruen ; and part of it and its impression on another 
block of chalk. Upper Chalk. Sussex. Dixon Coll. Figd. by 
Lonsdale, in Dixon, Geol. Suss. pi. xviii. a, figs. 2, 2a. 
A zoarium in which the lower part is of the normal phnnatas type. 
The upper part corresponds to the form of von Ilagenow, having 
no selvage, rounded lateral edges, and irregularly arranged aper- 
tures. Upper Chalk : Zone of Belemnitella mucronata. Clarendon, 
near Salisbury. Gamble Coll. Figd. PI. XII. Fig. ^h. 
A thin section through a young zoarium. Middle Chalk. Chatham. 
Vine Coll., Xo. 99. Recorded by Vine as Epidictyon plumatus: 
Rep. Brit. Assoc. 1892, p. 336. Figd. PI. XII. Fig. 6«. 
A part of a small zoarium (probably the same as D. 703), on slide. 
Upper Chalk. Chatham. Vine Coll. Recorded by Vine as 
Epidictyon tenue. 
A fragment of a zoarium (on slide). Upper Chalk. Salisbury. 
Vine Coll. Recorded as Epidictyon tome by Vine, 1893: Rep. 
Brit. Assoc. 1892, p. 323. 
2. Siphoniotyphlus tenuis (von Hagenow), 1840. 
8Y^’ox^nT. 
Eschara tenuis, von Hagenow, 1840. !Mon. Riig., Nacht. ; Xeu. Jahrb. 1840, 
p. 645. 
Epidictyon tenue, Marsson, 1887. Bry. Riig. : Pal. Abb. vol. iv. p. 17, pi. i. fig. 4. 
,, ,, Vine, 1892. XotesUp.Ch. Bry. : Rep. Brit. Assoc. 1891, p. 658. 
Lanceopora striolata, von Reuss, 1874. Biy. ob. Plan.: Palueontogr. vol. xx. 
pt. 2, p. 130, pi. xxiv. figs. 17, 18. 
Diagnosis. 
Zoarium with the lowest part of the stem cylindiical or sub- 
cylindrical; the main portion of the stem is broad and flat, 
without lateral selvage. 
Zooecia somewhat irregularly arranged ; apertures distant ; the 
pinnate arrangement is barely recognizable. 
