GLOSSOLOGY. 



Imaginary generalised Diagrams of Ilydroids to illustrate the terminology. 



In order better to distinguish the various parts and to render the respective limits of the trophosome and 

 gonosome at once apparent, the endoderm and ectoderm of the gonosome are in both figures represented by 

 simple outline, while in the trophosome the endoderm is throughout distinguished by a heavy line, the ectoderm 

 by transverse hatching, and the perisarc by a simple wavy line. 



I. ir. 



I. Imaginary generalised Diagram of a Gt/mnoh!astie Egdroid.—?' ?'J\^'.ji ^y?^'"^'"^"^- 1 Hydropbyton. c, c, c— Somatic cavity. 



e,'e,'e.— Ectoderm of hydrophy ton."' I Coenosarc. /,/,/.— Perisarc. j.—Hydranth extended. /.—Hydranth contracted. 

 h, h. — Hypostonie bearing the mouth at its extremity. k. — Sacciform gonopbore (sporosnc) springing from the hydrocaulus. 

 f .— Sporosac springing from a blastostyle. In J, f , the spadix is seen to occupy the axis of the sporosac, and round the spadix 

 are developed the generative elements. I. — Medusiform gonopboi'e (planoblast). A manubrium occupies its axis, and in the 



walls of this the generative elements are directly developed. m. — Blastostyle. 



II. Imaginary generalised Diagram of a Calyptohastic Bydroid.— The letters o to A indicate the same parts as in I. i, !.— Hydrotheca. 



k. — Sporosac springing from a blastostyle, with the generative elements developed round a spadix which occupies the axis of 

 the sporosac. I. — Planoblast springing from a blastostyle. m, m. — Blastostyle. ». — G 



