GLOSSARY OF TECHNICAL TERMS. 607 



Scuta. Two lateral basal calcareous plates of carapace in certain barnacles. 



Second niaxillcc. Usually sixth pair of appendages to head. 



Second inaxillipeds. Eighth pair of appendages to head. 



Securiform. Shaped like an axe or hatchet. 



Segment. A division, as if cut off. 



Sense-club. Feeling-organ. 



Sensory. Relating to the sense of feeling. 



Septum. Membrane, usually when forming a separation. 



Serrate. Notched like a saw. 



Sessile. Fixed, or without stalk. 



Seta. Bristle. 



Setaceous. Bristle-like. 



Setiferous. Bearing bristles. 



Setose. Setous or bristly. • 



Sexual. Pertaining to the sex. 



Shell. Carapace when covering whole of body, as in many entoniostraca. 



Shell-glands. Renal organ, also sometimes including a urinary tube and a 



small bladder. 

 Sigmoid. Formed like the letter S. 

 Sinuous. Bending in and out. 

 Sinus. Fold or bend. 

 Siphonal. Bent tube. 

 Solitary. Living alone. 



Somite. Any one morphological segment of an articulated body. 

 Spaces. Blood-sinuses. 

 Spatulate. Shaped like a spade or spoon. 

 Sperm. Male or seminal elements. 



Spermatophore. Special case or capsule containing spermatozoa. 

 Spiniform. Shaped like a spine. 



Spinning-glands. As those on feet of certain amphipods. 

 Spinulated. Furnished with little spines. 

 Spinule. Little spine. 

 Spinulose. With spines or thorns. 

 Squame. Exopodite of antenna. 



Sternum. Ventral region of an abdominal segment, as in the crawfish 

 Stria. Little channels, flutings or lines. 

 Style. Pillar. 



Stylet. A little pillar or stalk. 

 Styliform. Shaped like a pillar. 



Stylocerite. Spine or scale on basal joint of antennular peduncle. 

 Subchclate. Partly claw-like. 

 Subcheliforni. Partly formed like a claw. 

 Subglobular. Partly spherical. 

 Subpediform. Partly shaped like a foot. 

 Suctorial. Sucking-like. 

 Sulcus. CTroove. 



Superior antenna. Antennule or first antenna. 

 Szvimming-feet. Said of limbs used in swimming, usually in distinction to 



anterior limbs, which may be foot-jaws or ambulatory; pleopods. 

 Syn-ccrebrum. Compound brain. 



