The maxill of Apus are also much the more specialized and reduced.
The single family Apodidae contains only two genera, Apus and its very near neighbour Lepidurus.
The specimens examined were obtained from the Bambusa Apus, growing in the Residency of Bantam.
In Apus the nerves leading to the eyes come off from the anterior ganglion or "brain" and run directly to the eyes.
The outline figure is so obviously modeled on an appendage of Apus that one is inclined to think it somewhat diagrammatic.
The trunk limbs of Apus are supposed to be the most primitive among the Branchiopoda, and comparison will be made with them.
In some Phyllopoda (Apus) egg-sacs are formed by modification of certain of the thoracic feet.
Beecher's comparison of the posterior thoracic and pygidial limbs of Triarthrus with those of Apus can not be sustained.
As already frequently stated, Apus and Branchipus are the two living arthropods which most nearly resemble the extinct trilobites.
Compared with Apus, Burgessia appears both more primitive and more specialized.