8l6 GLOSSARY. 



STREPSIRHINA (Gr. strepho, I twist ; rhines, nostrils). A group of the Quad- 

 rumana, often spoken of as Prosimios. 



STROBILA (Gr. strobiles, a top, or fir-cone). The adult Tape-worm, with its 

 generative segments or proglottides ; also applied to one of the stages in the 

 life-history of the Lucernarida. 



STYLIFORM (Lat. stylus, a pointed instrument ; forma, form). Pointed in 

 shape. 



SUB-CALCAREOUS. Somewhat calcareous. 



SUB-CENTRAL. Nearly central, but not quite. 



SUB-PEDUNCULATE. Supported upon a very short stem. 



SUB-SESSILE. Nearly sessile, or almost without a stalk. 



SUPINATION (Lat. supinus, lying with the face upwards). The act of turning 

 the hand with the palm upwards. 



SUTURE (Lat. suo, I sew). The line of junction of two parts which are im- 

 movably connected together. Applied to the line where the whorls of a 

 univalve shell join one another; also to the lines made upon the exterior of 

 the shell of a chambered Cephalopod by the margins of the septa. 



SWIMMERETS. The limbs of Crustacea, which are adapted for swimming. 



SYMPHYSIS (Gr. sumphusis, a growing together). Union of two bones in which 

 there is no motion, or but a very limited amount. 



SYNAPTICUL.E (Gr. sunapto, I fasten together). Transverse props sometimes 

 found in Corals, extending across the loculi like the bars of a grate. 



SYSTOLE^ (Gr. sustello, I contract). Applied to the contraction of any contrac- 

 tile cavity, especially the heart. 



TABULA (Lat. tabula, a tablet). Horizontal plates or floors found in some 

 Corals, extending across the cavity of the " theca," from side to side. 



TACTILE (Lat. tanpo, I touch). Connected with the sense of touch. 



TJEXIADA (Gr. talnia, a ribbon). The division of Scolecida comprising the 

 Tape-worms. 



T.&NIOID (Gr. tainia ; and eidos, form). Kibbon-shaped, like a Tape-worm. 



TARSO-METATARSUS. The single bone in the leg of Birds produced by the 

 union and anchylosis of the lower and distal portion of the tarsus with the 

 whole of the metatarsus. 



TARSUS (Gr. tarsos, the flat of the foot). The small bones which form the 

 ankle (or " instep " of man), and which correspond with the wrist (carpus) 

 of the anterior limb. 



TECTIBRANCHIATA (Lat. tectus, covered ; and Gr. bragchia, gills). A division 

 of Opisthobranchiate Gasteropoda in which the gills are protected by the 

 mantle. 



TEGUMENTARY (Lat. tegumentum, a covering). Connected with the integument 

 or skin. 



TELEOSTEI (Gr. teleios, perfect; osteon, bone). The order of the "Bony" 

 Fishes. 



TELSON (Gr. a limit). The last joint in the abdomen of Crustacea ; vari- 

 ously regarded as a segment without appendages, or as an azygous ap- 

 pendage. 



TENUIROSTRES (Lat. tennis, slender ; rostrum, beak). A group of the Perch- 

 ing Birds characterised by their slender beaks. 



TERGUM (Lat. for back). The dorsal arc of the somite of an Arthropod. 



TERRICOLA (Lat. terra, earth ; and colo, I inhabit). Employed occasionally to 

 designate the Earth-worms (Luriibricid<x). 



TEST (Lat. testa, shell). The shell of Mollusca, which are for this reason 

 sometimes called " Testacea ;" also, the calcareous case of Echinoderms ; 

 also, the thick leathery outer tunic in the Tunicata. 



TESTACEOUS. Provided with a shell or hard covering. 



TESTIS (Lat. testis, the testicle). The organ in the male animal which pro- 

 duces the generative fluid or semen. 



TETRABRANCHIATA (Gr. tetra, four ; bragchia, gill). The order of Cephalopoda 

 characterised by the possession of four gills. 



THALASSICOLLIDA (Gr. thalassa, sea : kolla, glue). A division of Protozoa. 



THECA (Gr. theke, a sheath^. A sheath or receptacle. 



