REPORT ON THE SIPHONOPHORiE. 



145 



Synopsis of the Genera of ' Diphyidse. 



III. Subfamily 

 Abylim:. 



Two nectophores of very 

 different size and form, 

 one placed behind the 

 other ; both prismatic, 

 with polygonal faces 

 and sharp edges. 



I. Subfamily 



PRAYID.E. 



Two nectophores of nearly 

 equal size and similar 

 form, opposite to one an- 

 other, edgeless, rounded. 



II. Subfamily 



Diphyopsid.e. 



Two nectophores of nearly 

 equal size and similar 

 form, one placed behind 

 the other, pyramidal, 

 five-edged. 



Bracts of the cormidia 

 hemispherical, cup- 

 shaped or helmet- 

 shaped, edgeless, round- 

 ed. Phyllocyst with 

 four radial canals. 



Bracts of the cormidia 

 pyramidal, conical, or 

 spathiform, with a 

 pointed apex, and an 

 obliquely bevelled basal 

 face and a deep ventral 

 fissure. Phyllocyst 



ovate, simple or rudi- 

 mentary, without radial 

 canals. 



Bracts of the cormidia six- 

 sided prismatic. Phyl- 

 locyst descending, with 

 two lateral canals at its 

 apex. 



Bracts of the cormidia 

 four-sided prismatic, 

 below wedge-shaped. <j 

 Phyllocyst ascending, 

 with an odd basal canal. 



Bracts of the cormidia f 



cuboidal, with a caudal J 



apophysis. Phyllocyst j 

 with four radial canals. 



Cormidia (or Eudoxiae) 

 without special necto- 

 phores, 



Each cormidium (or Eu- 

 doxia) with a special 

 nectophore, . 



Cormidia without special 

 nectophores, sessile. 

 First nectophore with- 

 out hydrcecium, . 



Cormidia without special 

 nectophores, free Eu- 

 doxise. First necto- 

 phore with a conical 

 hydrcecium, 



Each cormidium (or each 

 Eudoxia) with a special 

 nectophore, free. First 

 nectophore with a coni- 

 cal hydroeeium, . 



24. Praya. 



25. Lilyopsin. 



26. Galeolaria. 



27. Diphyes. 



28. Diphyopsis. 



Basal nectophore three- 

 sided prismatic, with 

 three wing-shaped edges. 

 Mouth trigonal, . . 29. Aby/a. 



Basal nectophore four- 

 sided, pyramidal, with 

 four wing-shaped edges. 

 Mouth tetragonal, . 30. Bosnia. 



Basal nectophore five- 

 sided prismatic, with 

 five wing-shaped edges. 

 Mouth pentagonal, . 31. Calpe. 



Subfamily Prayid^;. 



Genus 24. Praya, 1 Blainville, 1834. 

 Praya, Blainville, Manuel d'Actinologie, 24, p. 137. 

 Definition. — Diphyidse with two rounded, reniform or mitriform, edgeless nectophores 

 of similar form and subequal size, opposed to one another. A hydrcecial canal is formed 

 by the opposite hemicylindrical ventral grooves of the two nectophores. Bracts hemi- 

 spherical, helmet-shaped or reniform. Phyllocyst with (four) radial canals. Cormidia 

 without special nectophores. 



1 Prai/o=Porto Praya, the name of a place in the Cape Verde Islands, where this Siphonophore was first observed. 

 (ZOOL. CHALL. EXP — PART LXXVIL — 1888.) Hhhh 19 



