whorl, must be free of any appendage connected to it at the
point crossed by the line of flow and on the delta side. An appendage
at that point is considered to spoil the recurve or obstruction.

[Illustration: 213]

[Illustration: 214]

[Illustration: 215]

[Illustration: 216]

[Illustration: 217]

[Illustration: 218]

[Illustration: 219]

[Illustration: 220]

[Illustration: 221]

[Illustration: 222]

[Illustration: 223]

[Illustration: 224]

[Illustration: 225]

[Illustration: 226]

[Illustration: 227]

[Illustration: 228]

[Illustration: 229]

[Illustration: 230]

[Illustration: 231]

[Illustration: 232]

[Illustration: 233]

[Illustration: 234]

[Illustration: 235]

[Illustration: 236]

Figures 237 and 238 are also central pocket loops despite the
appendages connected to the recurves, because they are not connected
at the point crossed by the line of flow.

Figure 239, although possessing a recurve, is classified as a loop
because the second delta is located on the only recurving ridge.

[Illustration: 237]

[Illustration: 238]

[Illustration: 239]

[Illustration: 240]

[Illustration: 241]

[Illustration: 242]

Figures 240 to 244, although possessing one delta and a delta
formation, are classified as loops because the obstructions do not
cross the line of flow at right angles.

[Illustration: 243]

[Illustration: 244]

[Illustration: 245]

[Illustration: 246]

[Illustration: 247]

[Illustration: 248]

Figures 245 to 254 have two deltas and one or more recurves, but they
are classified as loops because each recurve is spoiled by an
appendage connected to it at the point crossed by the line of flow.

[Illustration: 249]

[Illustration: 250]

[Illustration: 251]

[Illustration: 252]

[Illustration: 253]

[Illustration: 254]

_Double loop_

Within the whorl group, the subclassification type "double loop" is
used for extension purposes only. In general classification it is
designated by the letter "W".

_The double loop consists of two separate loop formations, with two
separate and distinct sets of shoulders, and two deltas._

The word "separate," as used here, does not mean unconnected. The two
loops may be connected by an appending ridge provided that it does not
abut at right angles between the shoulders of the loop formation. The
appendage rule for the loop applies also to the double loop. An
appendage abutting upon a loop at right ang