To enclose the club in a protective covering form- ?0 ing a cup or vesicle, at first open distally; finally the opening closes and J' P g, ,.
The posterior, so-called processus Zygomaticus is very variable; in many Galli it encloses a foramen by distally joining the orbital process.
- The 3rd, 4th, 5th and 6th pairs of appendages short, stout, tapering, the segments about as wide as long, except the apical, which is distally slender, pointed, slightly curved, and without distinct movable claws.
- The 3rd, 4th, 5th and 6th pairs of appendages slender, not evenly tapering, the segments longer than wide; the apical segment short, distally truncate, and provided with a pair of movable claws.
In every species the segments develop from the scolex distally and increase in size with the maturation of the contained female genital organs.