102 



THE VOYAGE OF H.M.S. CHALLENGES. 



Metagenesis Calyconectarum. 



Synopsis of the alternation of generations in the genera of monogastric and polygastric 

 Calyconectse (compare the descriptions of the individual genera and species in this 

 Report). 



I. Monogastric Generation. 



Diplophysa inermis, Ggbr., Mediterranean. 

 Diplophysa kollikeri, HkL, Tropical Pacific, Indian 

 Ocean. 



? Eudoxella didyma, Hkl., Atlantic. 



? Eudoxella galea, Hkl., North Atlantic. 



Cucubalus eschscholtzii, Huxley, Mediterranean. 

 Cucubalus pyramidalis, Will, North Atlantic. 

 ? Cucubalus cordiformis, Quoy, Tropical Pacific. 



Cuboides vitreus, Quoy, Mediterranean. 

 Cuboides erysfallus, Hkl., North Atlantic. 

 Cuboides nacella, Hkl., Indian Ocean. 

 Cuboides vogtii, Hkl., Tropical Pacific. 



Cucullus campanula, Hkl., North Mediterranean. 

 Cucullus gegenbauri, Hkl. ( = Eudoxia messanensis, 



Ggbr.), South Mediterranean. 



Cucullus subtilis, Hkl., Mediterranean. 



? Cucullus elongatus, Hkl., North Atlantic. 



Cucullus lessoni, Lesson, Pacific. 



Cucullus gracilis, Hkl., Indian Ocean. 



Amphiroa trigona, Hkl, Mediterranean. 



Amphiroa carina, Hkl., Tropical Atlantic. 

 ? Amphiroa alata, Huxley, Indian and Pacific Ocean. 

 I Amphiroa angulata, Huxley, South Pacific. 



Sphenoides tetragona, Hkl., Indian Ocean. 

 Sphenoides obeliscus, HkL, North Atlantic. 

 ? Sphenoides perforata, Hkl., Tropical Atlantic. 

 Sphenoides australis, Huxley, South Pacific. 



Aglaisma eschscholtzii, Huxley, Mediterranean. 

 Agldisma gegenbauri, Hid., Tropical and Subtropical 

 Atlantic. 

 ? Aglaisma elongata, Huxley, Tropical Pacific. 



1 Erssta gaimardi, Esch, Mediterranean. 

 Erssea compressa, Hkl., Tropical Atlantic. 

 Erssea dispar, Hkl., Tropical Pacific. 



II. Polygastric Generation. 



Spheerunectes gracilis, Hkl., Mediterranean. 

 Sphwonedes kollikeri, Huxley, Tropical Pacific, 

 Indian Ocean. 



? Praya eymbiformis, Leuck., Atlantic. 

 ? Praya galea, Hkl., North Atlantic. 



MuggUea kochii, Chun, Mediterranean. 

 Muggixa pyramidalis, Busch, North Atlantic. 

 ? Muggista chamissonis, Hkl., Tropical Pacific. 



Cymba enneagonum, Esch., Mediterranean. 

 Cymba crystallus, Hkl., North Atlantic. 

 Cymba nacella, Lesson, Indian Ocean. 

 Cymba vogtii, Hkl.. Tropical Pacific. 



. Diphyes acuminata, Leuck., North Mediterranean. 



Diphyes sieboldii, Koll. ( = Diphyes gracilis, Ggbr.), 

 South Mediterranean. 



Diphyes subtilis, Chun, Mediterranean. 

 ? Diphyes elongata, Hyndman, North Atlantic. 



Diphyes appendicidata, Esch., Pacific. 



Diphyes gracilis, Hkl., Indian Ocean. 



Abyla trigona, Quoy, Mediterranean. 



Abyla carina, Hkl., Tropical Atlantic. 

 ? Abyla alata, Hkl., Indian and Pacific Ocean. 

 f Abyla. leuckarti, Huxley, South Pacific. 



Bassia tetragona, Hkl., Indian Ocean. 

 Bassia obeliscus, Hkl., North Atlantic. 

 ? Bassia perforata, L. Ag., Tropical Atlantic. 

 Bassia quadrilatera, Quoy, South Pacific. 



Calpe pentagona, Quoy, Mediterranean. 

 Calpe gegenbauri, Hkl., Tropical and Subtropical 

 Atlantic. 

 ? Calpe huxleyi, Hkl., Tropical Pacific. 



? Diphyopsis campcmuliferd, Hkl., Mediterranean. 

 Diphyopsis compressa, Hkl., Tropical Atlantic. 

 Diphyopsis dispar, Hkl., Tropical Pacific. 



? Lilaa medusina, Hkl., Indian Ocean. 



? Lilyopsis medusina, Hkl., Indian Ocean. 



