4 
8 OS ere 
oh Apch 2 Sp Wh ot At ek 
Mr. F. M‘Coy on some new genera and species of 
shows the central area as a thick, smooth, persistent tube) ; 
diameter of the adult little more than an inch, and which it 
attains at two inches long, remaining nearly cylindrical after 
that length; surface closely striated longitudinally, about fifteen 
striz in one-fourth of an inch, corresponding in number with 
the radiating lamella: horizontal section, inner area rather 
more than one-third the diameter, of small, closely blended, 
vesicular plates ; outer area with 180 radiating lamelle, ninety 
of which reach from the wall to the edge of the inner area, and 
ninety intermediate ones only reach half way; intermediate 
transverse vesicular plates very delicate : vertical section, Inner 
area defined by rather thick walls; it consists of minute, com- 
pressed, elongate cells, arranged in transverse curved rows, 
the convexity of the curve upwards ; outer area, large cellular 
structure, inclining upwards and outwards. 
Rather common in the carboniferous limestone of Derbyshire. 
(Col. University of Cambridge.) ee 
Strephodes (M‘Coy), n. g. 
Etym. otpédo, torqueo (from the twisting of the lamelle 
about the centre). 
(Strombodes pars of Lonsdale, not of Schweigger.) 
Gen. Char. Corallum simple and conic, or compound and form- 
~ gmall vesicular — strue- 
- diating  lamelle, conver- 
ing rounded masses of 
inseparably united poly- 
gonal cells; in either case 
the terminal cup is deep 
with numerous equal, ra- 
ging fromthe wallsto the 
centre, where they meet 
and are complicated, 
usually twisted in bun- 
dles about an imaginary 
axis: vertical section, 
ture, the rows of cells ar- 
ranged in a semielliptical 
curve, convexity down- 
wards, descending from 
the sides at a steep angle 
and rounding under the | 
centre, where the cells Strephodes: a. vertical section and termi- 
are a little larger than al cells ofcompound species ; 6. do. sim- 
at the sides: horizontal P'¢ species. 
