143 



longogranula n. sp. Hawaii 

 zamboangae n. sp. Zamboanga 

 sluiteri n. sp. Amboina 



Though some of the species are rather insufficiently described, 

 they may be distinguished by the characters used in the key. 



Key to the species of Polyplectana. 



1. Anchors and anchor-plates all more or less reduced and irregularly 



formed sluiteri 



Anchors and anchor-plates are usually not reduced, at any rate not 



in the posterior end of the body. Only some of the anchor-plates in 

 the anterior part of the body may be somewhat irregular 2 



2. Minute rods present in the tentacles 3 



No minute rods in the tentacles 4 



3. American species with but few rods in each tentacle oculata 



Samoan species with numerous rods in each tentacle samoae 



4. Miliary granules unusually stout; (Tahiti) tahitiensis 



Miliary granules rather small and thin or quite wanting 5 



5. Miliary granules totally wanting; (Tahiti) galatheae 



Miliary granules present 6 



6. Distinct muscular impressions on the calcareous ring (Fig. 12. 2) 7 



No distinct muscular impressions on the calcareous ring, only seen as 

 dark spots (Fig. 12. 3) 8 



7. Miliary granules long and slender rods, which are usually unbranched. 



The middle of the rods often swollen (Fig. 11. 1 — 2) longogranula 



Miliarly granules irregularly branched bodies kallipeplos 



8. Miliary granules long and slender, not irregularly branched (Fig. 11. 



3 — 4) zamboangae 



Miliary granules not long and slender rods, but short and irregularly 

 shaped bodies (Fig. 11.9 — 10) kefersteinii 



Polyplectana kefersteinii (Selenka). 



Synapta kefersteinii. Selenka. 1867. Beiträge zur Anatomie und Sy- 

 stematik der Holothurien, pag. 360, Pl. XX fig. 

 120—121. 



Chondrocloea kefersteinii. 0stergren. 1898. Das System der Synap- 



tiden, pag. 114. 



Synaptula kefersteinii. Fisher. 1907. The Hawaiian Holothurians, 



pag. 719, PI. 80 fig. 2. 

 Polyplectana kefersteinii. Clark. 1908. The Apodous Holothurians, 



pag. 16 & 76, Pl. IV flg. 20—22. 

 Hilo, Hawaii. IV. 1915. One specimen (= two fragments) 



