SIP- 



293 



SOM- 



siphon, tube ; zoon, animal ; eidos, 

 resemblance.] A smaller indi- 

 vidual of certain Alcyonarian 

 colonies, without tentacles or 

 gonads (zool.}. 



siphorhinal (sl'fori'nal) a. [Gk. 

 siphon, tube ; rhis, nose.] With 

 tubular nostrils (zool.}. 



siphuncle (sifung'kl) n. [L. siphun- 

 culus, a small tube.] A siphonet ; 

 a median tube of skin, partly cal- 

 careous, connecting up all the 

 compartments of a Nautilus shell 

 (zool.}. 



siphunculate (sifung'kulat) a. [L. 

 siphunculus, a small tube.] Having 

 a siphuncle. 



sitotropism (sitot'ropizm) n. [Gk. 

 sttos, food ; trope, a turning.] 

 Tendency to turn in the direction 

 of food ; reaction towards the 

 stimulating influences of food 

 (dial.). 



skeletal (skeletal) a. [Gk. skeletos, 

 dried.] Pert, the skeleton (bot., 

 . zool.}. 



skeletogenous (skeTgtoj'enus) a. [Gk. 

 skeletos, hard ; genos, offspring.] 

 Appl. embryonic structures or parts 

 which ultimately develop into parts 

 of the skeleton (biol.}. 



skeleton (skeTgton) n. [Gk. skeletos, 

 dried, hard.] The hard or bony 

 framework, internal or external, 

 which supports and protects the 

 softer parts of the body of plant 

 or animal. 



skin (skin) n. [Swed. skinn, skin.] 

 The external covering of an animal, 

 plant, fruit, or seed. 



skin-gills, transparent contractile 

 outgrowths from the skin of Aster- 

 oids, with respiratory function 

 (zool.}. 



skin-rings, annular markings on the 

 body of a Worm. 



skull (skul) n. [M.E. skulle, the 

 cranium.] The cranium, or hard 

 and bony part of the head of a 

 vertebrate. 



slough (sluf) n. [M.E. slouh, skin 

 of a snake.] The dead outer skin 

 cast off periodically by Snakes 

 (zool.}. 



smell (sm61) n. [M.E. swel, odour.] 

 The impression produced on the 

 expanse of the olfactory nerve by 



inhaled air charged with odorous 

 matter, and therefrom communi- 

 cated to the olfactory centre of the 

 brain (phys.}. 



soboles (sbb'olez) n. [L. soboles, a 

 shoot.] A sucker or underground 

 creeping stem (bot.}. 



soboliferous (sob'olif&rus) a. [L. 

 soboles, shoot ; ferre, to carry.] 

 Having shoots or running stems 

 (bot.}. 



socket (sok'St) n. [L. soccus, a sock.] 

 A hollow into which something 

 fits, as that of humerus or femur 

 (anat.}. 



soft-rayed, having jointed fin-rays 

 (zool.}. 



soft-shelled, appl. mud Tortoises 

 with flat shell without horny 

 shields and covered with soft 

 leathery skin (zool.}. 



solar (so'lar) a. [L. sol, the sun.] 

 Having branches or filaments like 

 the rays of the sun (anat.}. 



solar plexus, a network of nerves 

 with some ganglia, situated behind 

 the stomach and supplying all the 

 abdominal viscera (anat.}. 



soleaform (sS'leaform) a. [L. solea, 

 sandal ; forma, shape.] Slipper- 

 shaped. 



solenia (sole'nla) n. plu. [Gk. solen, 

 a channel.] Endoderm-lined canals, 

 diverticula from the coelentera of a 

 zooid colony (zool.}. 



solenocytes (sole'nSsIts) n. plu. [Gk. 

 solen, channel ; kytos, hollow.] 

 Slender club-shaped tubular flagel- 

 lated cells connected with the 

 nephridia of some Polychaets, 

 Trochelminths, and of Amphioxus 

 (zool.}. 



solenostele (sole'nostel) n. [Gk. 

 solen, channel; stele, a column.] A 

 stage after the siphonostele in fern- 

 stem development (hot.}. 



soleus (so'leus) n. [L. solea, sole of 

 the foot.] A flat calf muscle below 

 the gastrocnemius (anat.}. 



soliped (sol'ipgd) a. [L. solidus, solid ; 

 pes, foot.] Solid-hoofed, as a horse 

 or zebra (zool.}. 



solitary glands or follicles, lym- 

 phoid nodules occurring singly on 

 the intestines ; Peyer's patches 

 (anat.}. 



soma (so'ma) n. [Gk. soma, body.] 



