432 Transactions of the Society. 



Hawaii : Island of Oahu. 



A whole day was spent in Honolulu, and about half of that 

 time was available for collecting. There was time to get a few 

 miles out of the town and into some very dense but low bush. 

 Everything was extremely dry, but there was a good deal of moss 

 on the trees and rocks, and this proved fairly productive when 

 examined some time afterwards. 



List of Species Collected. 



Philodina brevipes Murray. M. russeola (Zel.). 



P. rugosa Bryce. Rotifer longirostris (Janson). 



P. plena (Bryce). Habrotrocha pusilla (Bryce). 



P. vorax (Janson). H. angusticollis (Murray). 



Pleuretra brycei (Weber). H. longiceps (Murray). 



Callidina habita Bryce. H. perforata (Murray). 



C. plicatd Bryce. H. caudata Murray. 



C. punctata Murray. H. constricia (Duj.). 



C. quadricornifera (Milne). H. leitgebii (Zel.). 



C. ehrenbergii Janson. H. auricidata Murray. 



C. multispinosa (Thomp.). Adineta vaga (Davis). 



Mniolia symbiotica (Zel.). A. gracilis Janson. 



Notes on the Species. 



J'/iilodina plena (Bryce). Plate XIV. figs. 4a-4b. 



Variety. — Differing from the type in having more numerous 

 teeth, 3 + 1 or 4 in each jaw. 



Pleuretra brycei (Weber). Plate XIV. figs. 1 and 2a-2c. 



Variety (fig. 1). — Spines on the anterior margin of the trunk, 

 forming the furca for the antenna, moderately large ; the others on 

 the anterior margin very small. Main dorsal series of ten spines ; 



EXPLANATION OF PLATE XV. 



Fig. 5. — Callidina multispitwsa (Thomp.), variety. 



,, .6a. Ditto. Short-spined variety. 



„ 66. Ditto. Jaw. 



„ 7. — Rotifer longirostris (Janson), var. fimbriata Murray. 



„ 8a. — Habrotrocha nodosa sp. n. 



,, 86. Ditto. Jaw. 



,, 8c. 1 >itto. Side view of foot. 



,, 8d. Ditto. Spurs. 



,, He. Ditto. Slightly different spurs. 



,, 8/. Ditto. Contracted. 



,, 9a.— Habrotrocha sp. (?). 



96. Ditto. Jaw. 



„ 'Jc Ditto. Spurs. 



