. 1883.] Geology and Paleontology. 531 
circular, parasitic; its lower side a thin, smooth membrane or 
plate of attachment ; its upper side more or less convex, and com- 
posed of thin squamiform or imbricating plates, usually smallest 
at the periphery. Ambulacra, a double series of transverse alter- 
nating plates, with smaller ones sometimes intercalated. Two or 
more rows of ambulacral pores. The ovarian or anal aperature 
in one of the inter-ambulacral areas. The genera are Agelacrinus, 
Edrioaster and Hemicystites. 
Order Lichenocrinoidea and family Lichenocrinide. Body at- 
tached during part or all of its life, circular, convex above, more 
or less crateriform around the stem. A thin, attaching plate on 
the lower side at some period of life. Upper side covered with 
polygonal plates, without traces of ambulacra, arms, mouth, pec- 
tnated rhombs or pores. Interior of visceral cavity with numer- 
ous radiating upright lamellæ supporting the polygonal lamelle 
Above. Stalk composed at its origin of interlocking plates, after- 
Wards of circular ones, ending in a point, flexible and perforated 
“longitudinal! À 
toidæ, in the first of which the radiating and circular systems be- 
‘Some complicated by the connection between succeeding coils 
through the flattened connecting finger-like processes; while in the 
latter the arrangement is more simple, as the interior radiations 
connect with a single marginal circular system. 
Myelodactylus is a coil in one plane, the whorls connected by 
ngct-like processes, and each whorl is composed of a series of 
Plates, having a tubular channel within. 
Cyclostoides has a circular marginal series of plates, with 
7 bular channel, connected with the interior by numerous 
pores that radiate from the center. In both these genera, the only 
known types of their families, the structure is so different from 
that usual in the Crinoidea, that the terms calyx, ambulacra, arms, 
“a Cannot be applied. 
p I Slostoides is from the Hudson ‘River group, Myelodactylus 
U m the Niagara, and Lichenocrinus from the Hudson River and 
tica slate, 
Tue Grotocy oF Sournern Arrica—The following is a 
a Condensed quotation of the lately published narrative 
«ests. Capello and Ivens : | 
The Physical configuration of Africa, south of the pac 
b. thus summed up: A depressed central basin, surround : 
rene Vast circle of high land, gradually descending to the sea, ane 
: ras iy deep ravines, through which rush huge water mars ai, 
; dered in the interior, till they overflow and seek the lower le 
o Ey. 7 
