14 UNITED STATES NATIONAL MUSEUM BULLETIN 251 



Of the approximately 400 specimens dissected for detailed examina- 

 tion, 117 species and varieties of ascidians and 13 of pelao-ic tunicates 

 were identified, as follows : 



ASCIDIACEA 



Order Aplousobranchia 

 Family Synoicidae 



1. ApUdium lobatvm Savigny. Gilbert, Palau, r.Iarianas. 

 la. ApUdium sp. aff. lobatiim Savigny. Marianas. 



2. ApUdium sp. aff. deprcssum Sluiter. Philippines. 



3. ApUdium spitziergense Hartmeyer. Bering Sea. 



4. ApUdium yesoense, new species. Japan. 



5. Amaroucium consteUatnm Verrill. Japan. 



6. Amaroucium glabrumY errill. Japan, Russia (Okhotsk Sea). 



7. Amaroucium pUciferum Redikorzev. Hawaii. 



8. Amaroucium sp. aff. monotonicum Tokioka. Palau. 



9. Amaroucium muUipUcatum (Sluiter). Gilbert, Palau. 



10. Amaroucium craterifcrum Sluiter. Palau. 



11. Amaroucium constrictum Sluiter. Palau. 



12. ApUdiopsis amoyense, new species. China. 



13. PohjcUnum tsutsuvi Tokioka. Gilbert, Palau, Philippines. 



14. PolycUnnm vascnlosum Pizon. Hawaii, Philippines, Marianas. 



15. PolycUnum constcUatum Savigny. Palau, Gilbert, Japan. 



16. RittereUa sp. aff. aequaU siphon is (Ritter & Forsyth). Japan. 



17. Euherdmania digitata IMillar. Palau. 



18. Polyclinid in strobilization (?). Korea Straits. 



Family Didemnidae 



19. Didemnum (Didcmnum) candiduin Savigny. Philippines, Gilbert, Hawaii, 



Galapagos, Palau. 



20. Didemnum (Didcmnum) moselcyi (Herdman). Australia, Gilbert, Japan, 



Palau, Philippines. 

 20a. Didcmnum (Didemnum) moselcyi f. granulatum Tokioka. Palau. 



21. Didcmnum (Didemnum) nckozifa, new species. Palau, Philippines. 



22. Didcmnum (Didemnum) sphacricum, new species. Palau. 



23. Didemnum CiDidcmmim) macrospiculatum, new species. Gilbert. 



24. Didemnum (Didcmnum) siphonale, new species. Japan. 



2.5. Didemnum (Didcmnum) dorotubu, new name. China, Philippines. 



2G. Didcmnum (Didcmnum) misakiense (Oka & Willey). Japan, Philippines. 



27. Didcmnum (Didemnum) ternatanum (Gottsclialdt). Palau, Philippines. 



28. Didcmnum (Polysyncraton) sagamiana Tokioka. Palau. 



29. Didemnum (Polysyncraton) scmifuscmn (Sluiter). Gilbert. 



30. Trididcmmim savignii (Herdman). Hawaii, Palau, Marianas, Philippines, 



Japan. 



31. Trididemnum savignii var. jolcnsc (Van Name). Gilbert, Palau, Philippines, 



Gulf of Mexico. 



32. Trididemnum Cyclops Michaelsen. Gilbert. 



33. Trididcmmim viride (Herdman). I'hilippines. 



34. Lcptoclinides rcticulutus (Sluiter). Palau, Gilbert. 



35. Lcptoclinides hawaiicnsis, new species. Hawaii. 



36. Echinoclinum pliilippincnsc, new species. Philippines. 



37. LissocUnum fragile (Van Name). Palau, Philippines. 



38. LissocUnum mollc (Herdman). Palau. 



39. LissocUnum patella (Gottschaldt). Palau, Philippines. 



