100 THE APODOtrS HOLOTHUBIANS 



Anchor-arms with 5 or 6 teeth and holes in plates with 



1-3 teeth or none benedeni 



GG. — Anchors over 1 mm. long. 



Plate abruptly contracted posteriorly and provided with 

 very numerous, small, entire holes (plate v, fig. 33). 



EODEA 



Plate not abruptly contracted: provided with holes of 



very unequal size denticulata 



CO. — Anchors conspicuously asymmetrical (plate iv, fig. 15; plate v, fig. 36). 

 D. — Accessory calcareous bodies in the form of perforated plates. 



Accessory perforated plates normally with 4 dentate h^les (plate v. 



fio-. 35") ASTMMETRICA 



Accessory perforated plates normally with 10 dentate holes (plate v. 



fig. 34) LDDWIGII 



DD. — Accessory calcareous bodies in tlic form of small cruciform or branched 

 rods (plate iv, fig. 16). Anchors grotesquely asymmetrical (fig. 15). 



PETERSI 



BB. — Anchors and plates of two distinct sorts, differing especially in size; largo anchors 

 witli serrate arms. 



Large anchor-plates with cora.iaratively few (less than 100) holes; these are 

 rather large, polygonal, and unooth ; small anchors with smooth arms ; ac- 

 cessory calcareous bodies, small cruciform or branched rods. 



PSEUDO-DIGITATA 



Tjarge anchor-plates with numerous (150 or more) holes; these are small, cir- 

 cular, and dentate; small anchors with serrate arms; accessory calcareous 



bodies, minute oval granules bankensis 



A.i.— Tentacles 10 ; brackish water similis 



Pkotanktha challengeri. 



Plate V, Fig. S6. 



Synapfa chaJIengeri Theel, 1886a, p. 14. Calcareous particles, pi. i. fig. 4. 

 Protanl-yra challengeri Ostergren, 1898&. 



Protanhjra challengeri var. Sibogw Sluiter, 1901, p. 131 ; pi. iii, fig. 5. 

 Protanhjra timida Koehler and Vaney, 1905, p. 108. Calcareous particles, pi. sv, 



figs. 33-35. 

 Protanl-yra alhatrossi Fisher, 1907, p. 728. Calcareous particles, pi. lxxxi, figs. 1, 



la, and pi. lxxxii, figs. 4, 4a-c. 



Length. — 80-100 mm. 



Color. — Reddish, yellowisli or whitish, sometimes with a lilac tinge. 



DiSTRiBiTTioN. — Reported from near the Fiji Islands, 252 m. (Theel); from 

 near Am, Arafura Sea, 1,788 m. (Sluiter) ; near Andaman Islands, 1,010 and 1,170 

 m. (Koehler and Vaney) ; Hawaiian Islands, 257-1,586 m. (Fisher). 



Remarks. — The anchor-plates ally this species to the preceding genus, 

 with which it is a sort of connecting link. Sluiter 's specimens were so nearly 

 like Theel 's that the slight differences in color, anchor-])lates, and abundance of 

 miliary granules are not enough to warrant our regarding the form as a dis- 

 tinct variety; neither is the difference in the depths at which they were taken 



