SPECIES OF MARINE PLANARIANS. 87 



III. 



(Synopsis of the Genera and Species described and figured in the present Paper.) 



[Note. — Diesing's main divisions were founded upon the presence or absence of tentacles ; but Stimp- 

 son pertinently remarks that such a division separates allied forms, such as Stylochus and Leptoplana, 

 while widely separated ones, such as Eurylepta and Planaria, were approximated. In view of this 1 

 therefore follow Stimpson in founding the subtribes upon the presence or absence of a second genital 

 aperture, instead of the mere presence or absence of tentacular appendages. — C. C] 



TJJRBBLLARIA DENDROCCELA. 



(Tubus alimentarius dendritice rarnosus.) 



Subtribus I. Digonoi'OB,a. Two genital apertures. 



(All the species are included in this subtribe.) 



Family EURYLEPTIDiE. 



Genus Thysanozoon, Grube. 



1. Thysanozoon Alderi, Coll. Labuan. 



2. Thysanozoon Allmanni, Coll. Singapore. 



3. Thysanozoon auropunctatum, Kel. Aripo. 



Genus Acanthozoon, Col 1 ., n. g. 



4. Acanthozoon armatum, Kel. Ceylon. 



5. Acanthozoon papilio, Kel. Ceylon. 



Genus Sphyngiceps, Coll., n. g. 



6. Sphyngiceps lacteus, Coll. Singapore. 



Genus Pkoceros, Quatref. 



7. Proceros concinnus, Coll. Labuan. 



8. Proceros Hancockanus, Coll. Singapore. 



9. Proceros Buskii, Coll. Singapore. 



Genus Eurylepta, Hemp. & Ehren. 



10. Eurylepta fusca, Kel. Ceylon. 



11. Eurylepta atraviridis, Kel. Ceylon. 



12. Eurylepta undulata, Kel. Ceylon. 



13. Eurylepta violacea, Kel. Ceylon. 



14. Eurylepta dulcis, Kel. 



15. Eurylepta purpurea, Kel. Ceylon. 



16. Eurylepta viridis, Kel. Ceylon. 



17. Eurylepta affinis, Kel. Ceylon. 



18. Eurylepta cerebralis, Kel. Ceylon. 



19. Eurylepta striata, Kel. Ceylon. 



20. Eurylepta zeylanica, Kel. Ceylon. 



21. Eurylepta Kelaartii, Coll. Singapore. 



