356 GLOSSARY 



Plasmodium. A mass of protoplasm formed by the union of two or more amebiform 



bodies or individuals. 

 Plumose. Feathery; plume-like. 



Pollenose. Bearing a powdery or pollen-like substance. 

 Predacious. Living bj' prej-ing on other animals. 

 Prehensile. Adapted for gi-asping. 

 Proboscis. The tubular process of the head, especially of insects and arachnids, 



adapted for sucking or piercing. 

 Proglottid. The segment of a tapeworm. 

 Pro thorax. The anterior segment of the thorax of an insect. 

 Protophyta. The division of unicellular plants. 

 Protozoa. The phylum consisting of the unicellular animals. 

 Pruritus. An intense degree of itching. 

 Pseudopodia. Processes of the protoplasm of a cell which may be protruded or 



retracted, as for locomotion or for taking food. 

 Pubescent. Arrived at puberty, or the earliest age at which the reproductive func- 

 tion can be performed. 

 Puparium. The case in which an insect is enclosed between its larval stage and 



the state of full development or imago. 

 Pupiparous. Pertaining to insects in which the young are born ready to become 



pupse, as in the sheep tick. 

 Quiescent. At rest. 



Rostellum. A small beak or hook-like process. 

 Rostrum. A beak-like process or appendage. 



Saproph5rte. Any vegetable organism living on dead or decaying organic matter. 

 Schizogenesis. Reproduction by fission. 

 Schizogony. Same as schizogenesis. 

 Schizont. A malaria parasite of the asexual generation. 

 Scolex. The head of a tapeworm, either in the larval or adult stage. 

 Scutum. The dorsal shield or plate, present in certain ticks. 

 Serrate. Notched or toothed on the edge. 

 Somatic. Pertaining to the body as a whole. 

 Somite. One of the longitudinal segments into which the body of annelid worms, 



arthropods, and vertebrates is divided. 

 Spiracle. A breathing orifice, as in the tracheal openings of insects. 

 Spore. A germ or seed of one of the lower animals or plants. 

 Sporocyst. A case or cyst containing many spores. 

 Sporogenesis. Reproduction by means of spores. 

 Sporogony. Same as sporogenesis. 

 Sporozoite. One of the young active spores of a sporozoan produced by division of 



the passive spores contained in the sporocyst. 

 Sporulation. Spore formation. 

 Stigmata. Small spots or marks; usually applied to the respiratory openings of 



insects; spii-acles. 

 Strobila. An adult tapeworm. 

 Suctorial. Adapted for sucking. 

 Tarsus. In insects, the small segments forming the distal termination of the leg 



and articulating with the tibia. 



