:].">S THE VOYAGE OF H.M.S. CHALLENGER. 



Genus 4. Porpema, Hkl. (95, p. 30). 



8. Porpema medusa, Hkl. (Eeport, p. 61, PL XLVIL). South Atlantic, Station 327. 



9. Porpema lenticula, Hkl. (Morph. Siphon.). Indian Ocean. 



10. Porpema pileata, Hkl. (Morph. Siphon.). South Pacific (coast of Chili). 



Genus 5. PorpiteUa, Hkl. (95, p. 30). 



11. PorpiteUa pcctanthis, Hkl. (Eeport, p. 64, PL XLVL). North Pacific, Station 244. 



12. PorpiteUa ccerulea, Hkl. ( = Porpita ccerulea, Esch., 1, p. 179, Taf. xvi. fig. 5). Tropical 



Pacific. 



13. PorpiteUa radiata, Hkl. ( = Porpita raeliata, Brandt, 25, p. 40). Tropical Pacific. 



Genus 6. Porpita, Lamarck (90, p. 483). 



14. Porpita mediterranea, Esch. (1, p. 177). Oldest description and figure by Forskal (11, p. 103, 



Tab. xxvi. fig. L, 1). Best description and figure by Kolliker (4, p. 57, Taf. xii.). 

 Mediterranean. 



15. Porpita linn&ana, Lesson (3, p. 588). Best description and figure by Alex. Agassiz (57, p. 12, 



pis. vii.-xii.). North Atlantic. 



16. Porpita umbella, Esch. (1, p. 179= Porpita gigantea, Peron, 14, pi. xxxi. fig. 6). Tropical 



Atlantic (?). 



17. Porpita indica, Hkl. (= Porpita liitheanal, Brandt, 25, p. 41). Indian Ocean. 



18. Porpita fungia, Hkl. (Report, p. G7, PL XLV.). North Pacific, Stations 253 to 255. 



19. Porpita pacifica, Lesson (22, pi. vii. fig. 3). Tropical Pacific (near Peru) (?). 



20. Porpita australis, Hkl. (Morph. Siphon.). South Pacific. 



Family III. Velellid^, Esch. (1, p. 165). 

 Genus 7. Rataria, Esch. (1, p. 166). 



21. Rataria cristata, Hkl. (Report, p. 79, PL XLIV.). Tropical Atlantic, Station 348. 



22. Rataria mitrata, Esch. (1, p. 168, Taf. xvi. fig. 2). Tropical Atlantic, off the Cape Verde 



Islands (?). 



23. Rataria cordata, Esch. (1, p. 167, Taf. xvi. fig. 1). North Atlantic (?). 



Genus 8. Velella, Lamarck (90, p. 481). 



24. Velella spirans, Esch. (1, p. 172= Velella limbosa, Lamk., 90). Oldest description and 



figure by Forskal (11, p. 104, Tab. xxvi. fig. k). Best description and figure by Kolliker 

 (4, p. 46, Taf. xi. figs. 9-15). Mediterranean. 



