90 
(.01) to .51 mm. (.02) apart. A similar Canadian species lias 
larger tubes and spinuliferous cell-mouths. ; 
Ch^etetes microscopic a.- Generally small, cylindrical, 
solid branches, formed of radiately ascending and curving, 
crowded, polygonal non-septate tubes. Diameter of cell- 
mouths .28 mm. (.011). 
Syriixgopora fenestrata. —Habit and characters similar 
to the following, but smaller. The young somewhat resemble 
Aulopora tubceformis Hall (not Goldf.) Diameter of tubes 
2.29 mm. (.11). Occurs also in the Hamilton of C. W. 
Syrixgopora alectiformis. — Tubes large, loosely and 
confusedly aggregated, prostrate or declined, adhering to other 
corals, in the young state auloporiform; exterior smooth or 
faintly wrinkled; interior feebly striate. Diameter of tubes 
4.06 mm. (.16) to 5.84 mm. (.23). 
Syringopora crassata. —Tubes of medium or moderate 
size, very geniculate and confused, externally much wrinkled 
transversely; irregularly constricted, often compressed ; tube- 
walls unusually thick—the central cavity often nearly oblite¬ 
rated. Diameter of tubes 1.52 mm. (.06) to 2.03 mm. (.08). 
Zaphrentis Traversensis. —Fossette rudimentary. Dif¬ 
fers from Cyathophyllum simplex Hall in its more abundant 
epitheea, less contorted lamellae, its finely vesicular outer zone, 
and its more elongated and erect form. Often attached ob¬ 
liquely. 
Zaphrentis cystica.— Outer zone of finely vesicular tissue 
reaching nearly half way to the center; central septa very thin 
and irregular; lamellae about 60, of which half terminate with 
the vesicular zone. 
Cyathophyllum panicum.— Having the form and size (or 
somewhat smaller) of detached stems of JDiphyphyllum Ar- 
chiaci Billings, but without the double wall. Resembles (7. 
ecespitosum (Goldf.) E. & H., but is more delicate and more 
straggling. 
Cyathophyllum ? partitum. —Tubes small, branching; 
walls thick, without radial lamellae or visible striae; internal cav¬ 
ity divided by irregularly disposed vertical partitions, which, in 
transverse sections, describe the chord (instead of radius) of a 
circle; space inclosed between the lamellae and walls trans¬ 
versely and minutely septate. The same structure extends 
into the branches. Epitheea slightly wrinkled. Diameter of 
tubes 7.62 mm. (.3). Scarcely conforms to any established 
genus. 
Strom atop ora pustulifera.— In very large, spheroidal, 
ovoid or elongate masses, composed of arching, transverse 
layers, formed of laminae of coralline substance separated by a 
network of minute passages which, at intervals, coalesce and 
turn upwards through the layer, radiating and ramifying again 
on its upper side. The places where the layers are thus trav- 
