**FP** =Facing points.

By Kepler's second law the radius vector, **FP**, sweeps over equal areas in equal times.

Representing by P this position, it follows that the area of that portion of the ellipse contained between the radii vectores FB and **FP** will bear the same ratio to the whole area of the ellipse that t does to T, the time of revolution.

-**Fp** n by x-a, according to algebraical division, the remainder is R= po an +pla?

Arc tOe por:e in **fp**:crc: fo: t h er o io the l'ympottt of hcren.

D, E, F, Trochosphere stage, D **fp**, Pore in the foot (belonging mf, The mantle-flap or limbus to the pedal gland?).

Any number of points on the parabola are obtained by taking any point E on the directrix, joining EG and EF and drawing **FP** so that the angles PFE and DFE are equal.

Then EG produced meets **FP** in a point on the curve.

By comparing this with the expression for the centrifugal force (wap/g), it appears that the actual energy of a revolving body is equal to the potential energy **Fp**/2 due to the action of the deflecting force along one-half of the radius of curvature of the path of the body.

- An early stage in the development of Antedon, showing the foot-plate or "dorso-central" **fp** at the end of the stem col.

In Peripatus the prostomium of the Chaetopod-like ancestor is atrophied, but it is possible that two processes on the front of the head (**FP**) represent in the embryo the dwindled prostomial tentacles.

Of these facts is given by saying **FP**, Rudimentary frontal pro that the Onychophora are " deutercesses perhaps repre ognathous " - that is to say, that senting the prostomial the buccal somite carrying the mantentacles of Polychaeta.

**FP**, Frontal processes (observed in Cirrhiped nauplius-larvae) probably representing the prostomial tentacles of Chaetopods.

The effort was, indeed, foredoomed to failure, since it attempted the impossible task of framing a coherent 1 Synderesis(Gr.o-vvrininaes,from uvvr **fP** E%v,to watch closely, observe) is used in this sense in Jerome (Corn.