102 



THE VOYAGE OF H.M.S. CHALLENGER. 



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, Gghr., Mediterranean. 

 Diplophysa kollikeri, HkL, Tropical Pacific, Indian 

 Ocean. 



? Eudoxella didyma, Hkl., Atlantic. 



? Eudoxella galea, Hkl., North Atlantic. 



Cucubalus eschscholtzii, Huxley, Mediterranean. 

 Cucubalus pyramidaiis, Will, North Atlantic. 

 ? Cucubalus cordiformis, Quoy, Tropical Pacific. 



Guboides vitreus, Quoy, Mediterranean. 

 Cuboides crystallus, HkL, North Atlantic. 

 Cuboides nacella, Hkl., Indian Ocean. 

 Cuboides vogtii, HkL, Tropical Pacific. 



Cucullus campanula, HkL, North Mediterranean. 

 Cucullus gegenbauri, Hkl. ( = Eudoxia messanensis, 



Gghr.), South Mediterranean. 



Cucullus subtilis, HkL, Mediterranean. 



? Cuadlus 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. 

 1 Amphiroa angulata, Huxley, South Pacific. 



lichenoides tetragona, HkL, Indian Ocean. 

 Sphenoides obeliscus, HkL, North Atlantic. 

 ? Sphenoides perforata, HkL, Tropical Atlantic. 

 Sphenoides australis, Huxley, South Pacific. 



Aglaisma eschscholtzii, Huxley, Mediterranean. 

 Aglaisma gegenbauri, HkL, Tropical and Subtropical 

 Atlantic. 

 ? Aglaisma elongata, Huxley, Tropical Pacific. 



? Ersxa gaimardi, Esch, Mediterranean. 

 Ersxa compressa, HkL, Tropical Atlantic. 

 Ersssa dispar, HkL, Tropical Pacific. 



II. Polygastric Generation. 



Sphxronectes gracilis, HkL, Mediterranean. 

 Sphxronectes kollikeri, Huxley, Tropical Pacific, 

 Indian Ocean. 



? Praya cymbiformis, Leuck., Atlantic. 

 ? Praya galea, HkL, North Atlantic. 



Muggixa kochii, Chun, Mediterranean. 

 Muggima pyramidalis, Busch, North Atlantic. 

 ? Muggixa 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. 

 Dipliyes sieboldii, Kb'll. ( = Diphyes gracilis, Gghr.), 



South Mediterranean. 

 Diphyes subtilis, Chun, Mediterranean. 

 ? Diphyes elongata, Hyndman, North Atlantic. 

 Diphyes appendiculata, 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. 



? Diphyopsvs campanulifera, HkL, Mediterranean. 

 Diphynpsis nmipri.'ssa, HkL, Tropical Atlantic. 

 Diphyopsis dispar, HkL, Tropical Pacific. 



? Lilxa medusina, HkL, Indian Ocean. 



? Lilyopsis medusina, HkL, Indian Ocean. 



