Sin 204 



Sinciput. — The middle head or irons. Nitzch's 

 terra for the frons. (L. semi, half, and caput, 

 the head.) 



Sinuate. — Having large curved breaks in the margin 

 resembling bays. (L. sinus, a hollow, a bay, 

 etc.) 



Sinuate. — Slightly waved. (L. sinus.) 



Sinuato-undulate. — When fascise, strigae, lines, 

 etc., curve into obtuse sinuses. (L. sinuo, to 

 bend, curve, and undula, dimin. of imda, a 

 wave.) 



Sinuatus. — Sinuate ; a margin with a rounded 

 incision. (L. sinus.) 



Sinus. — ^A hollow, a bay, a cavity ; a fistula, a 

 groove. A curved break in an otherwise 

 straight margin. (L.) 



Siphon. — The respiratory tube of the mosquito 

 larvae. It is a more or less simple tube, but 

 varies considerably in shape, according to the 

 larvse. — Two trachea run through the siphon and 

 and feed the main tracheal system of the body ; 

 the end being provided with valved and 

 guarded openings. (Gr. siphon, a tube.) 



Siphuncles. — The cornicles. 



Siphunculus. — The siphuncle ; the real instrument 

 of suction, which when unemployed is retracted 

 within the tubulus. (G-r. siphuncule, dimin. of 

 siphon.) 



Siphunculate. — Possessing a siphon, or tube, as a 

 valve. (Gr. siphon.) 



