8 PROCEEDINGS OF THE NATIONAL MUSEUM. vor,. 60 



the divergence begins the under lip sends out a lobe, which curves 

 forward and upward around the upper lip and fastens the tAvo se- 

 curely together in the form of a tube (figs. 75 and 80). 



The mandibles originate on the ventral surface of the head outside 

 of the proboscis. Each is somewhat swollen at the base, then tapers 

 into a long and narrow shaft, which passes into the proboscis tube 

 through the opening between the upper and under lips. Inside the 

 proboscis each mandible is widened a little toward the tip and flat- 

 tened dorso-ventrally and the edges which face each other are finely 

 toothed. In Lanvproglena and Lernanthrojms the mandibles are 

 curved like a saber or sickle, with the convex side inward; in Flat- 

 schekia, Dichelesthiuin^ and Caetrodes they are straight and have 

 more the shape of a stylet. 



The first maxillae vary greatly in different genera ; when fully de- 

 veloped, as in Lernanthropus^ they are biramose, the endopod or 

 palp arising nearer the proboscis and consisting of a tiny process 

 armed with a single seta. The exopod is farther away from the 

 proboscis and is made up of two more or less elongated joints, tipped 

 with two or three setae (fig. 75), but in many of the genera the endo- 

 pod is entirely lacking and the exopod is destitute of setae. In 

 Hatschekia these maxillae consist of small papillae, each armed with 

 three setae, similar to those of the Ergasilidae. In Anthosoma both 

 rami are straight spines, the endopod several times the length of the 

 exopod (fig. 5). 



The second maxillae are usually smaller and weaker than the 

 maxillipeds. They are normally composed of a swollen basal joint, 

 an elongated and slender second joint, and a small terminal claw, and 

 are prehensile in function. In Lernanthropus the concave margin 

 of the claw is armed with two rows of small teeth, and there is a 

 small accessory claw at its base on the inner side (figs. 22 and 25). 

 In LamfrogJena these maxillae are the chief organs of prehension 

 and each is armed with a very stout curved claw, while the maxilli- 

 peds are much smaller and each is tipped with three tiny claws. 



The maxillipeds in most of the genera are important organs of 

 prehension and are much stronger and more powerfully developed 

 than the maxillae. They usually consist of a swollen basal joint 

 furnished with strong muscles and a curved terminal claw. In some 

 genera these claws are simple and shut down against the side of the 

 basal joint, as in Donusa, PseudoclaveUa., and Lernanthro'pus. In 

 other genera the terminal claw is barbed or furnished with one or 

 more teeth on the concave margin, as in Cyhicola^ Pseudocycnus^ and 

 Congericola^ and in Nemesis, Eudactylina, Dichelesthiuni^ and 

 Anthosoma there are outgrowths upon the basal joint into which the 

 tip of the claw fits, making it virtually a chela (fig. 82). Dicheles- 

 thium is the only genus in which both the second antennae and the 



