REPORT ON THE SIPHONOPHOR^E. 125 



phyes annectens (PI. XXX.). The latter agrees also in the formation of the gonophores. 

 Each cormidiura possesses, besides the large vigorously swimming special necto- 

 phore, a cluster of small gonophores, all either male or female. The umbrella of 

 the male gonophores is more developed than in Desmophyes. Among six specimens 

 examined four were males and two females. 



I observed half a dozen of these small interesting Ersseidse, which will be more 

 accurately described on another occasion, living in the Indian Ocean, during my voyage 

 from Aden to Bombay, in November 1881. I suspect that they are the detached cor- " 

 midia of some species of Lilyopsis (Genus 25). They may bear provisionally the name 

 Lilsca medusina. 



Family VI. Monophyid^e, Claus, 1874. 



Monophyidx, Claus, 1874, 70, p. 29. 

 Sphxronectidx, Huxley, 1859, 9, p. 50. 



Definition. — Calyconectse polygastricse, with a single nectophore at the apex of the 

 long tubular truncus. Cormidia ordinate, eudoxiform, separated by equal free inter- 

 nodes ; each siphon with a bract. 



The famdy Monophyidse comprises a small number of little known polygastric 

 Calyconectse, which are rather rare, of small size, but very interesting on account of their 

 simple structure. They all possess only a single permanent nectophore, and differ in 

 this character from the nearly allied Diphyidse, with which they were formerly united. 



Eschscholtz, in his fundamental work (1829, 1, p. 134), described only a single form 

 of Monophyidge, Cymba enneagonum, the free Eudoxia of which is his Cymba cuboides. 

 Both forms were discovered in the Straits of Gibraltar by Quoy and Gaimard, who called 

 the first (polygastric) form Enneagonum hyalinum, 1 and the second (monogastric) form 

 Cuboides vitreus. 



A second species of Monophyidse, inhabiting the Gulf of Trieste, was described in 

 1844 by Will, 2 under the name Diphyes kochii, and in 1851 by Busch, 3 as Muggisea pyra- 

 midalis. The same form was afterwards, by combination of both names, called Muggisea 

 kochii, by Chun (86, p. 3). He described its metagenesis and development from the 

 monogastric Eudoxia eschscholtzii. 



Huxley, in his excellent work on Oceanic Hydrozoa (1859, 9), described not less than 

 four different Monophyidte, viz. : — 



(1) Sphasronectes kollikeri, pi. iii. fig. 4. 



(2) Diphyes mitra, pi. i. fig. 4 (now Cymbonectes mitra). 



(3) Diphyes chamissonis, pi. i. fig. 3 (now Muggisea chamissonis). 



(4) Abyla vogtii, pi. ii. fig. 3 (now Cymba vogtii). 



1 20, pi. ii.D, figs. 1-6. 2 65, p. 77, Taf. ii. fig. 22. 3 67, Taf. iv. figs. 3-6. 



