UYDROIDS I51UGGS. 47 



III. AUDEN'HUiM. 



An examination of the co-types of tlie species described by Hilgeu- 

 dorf'' under the names of Aijlaophenia f x and Ai/litoplieuia t y, from the 

 Iveimadec Islands, has enabled me to assign these species to their correct 

 j)Ositions. 



Family PLUMULARID^. 



Genus Halicornaria, Viusk. 



Hatjcohnauia hians, Busk. 



Iluliconian'd hl((ns (Busk), Billard, Les Hydroides de I'Expedition du 

 Siboga, i., — Plumulariidae, 1913, p. QS (synonymy). 



Ayluopheuia ^ v, Hilgendorf, Trans. N.Z. Inst., xliii., 1910 (1911), p. 543, 

 hg. 5. 



The co-type of the species described by Hilgendorf as Aglaoplienia I 

 y agrees with Bale's^^ description and figures of Halicoryiaria hians (Busk), 

 except for the greater length of the thecate internodes compai"ed with 

 their diameter, the greater depth of the hydrothecse and their more erect 

 posture, and the greater distance of the intrathecal ridge from the base of 

 the hydrotheca. In these characters the specimen comes nearest to the 

 variety described by Ritchie^'^ from the Andaman Islands as Halicornaria 

 hians (Busk), var. prufuuda. I, therefore, ai-range the synonymy as 

 above, following Billard in including Ritchie's variety in the synonymy of 

 H. hia)is. 



Loc. — Denham Bay beach, Sunday Island, Kermadec Islands. 



Genus Lytocarpus, Allnum. 



LyTOCARPUS PHCENieEUS, Bush. 



Lytucarpns phamiceus (Busk), Billard, Les Hydroides de I'Expedition du 

 Siboga, i., — Plumulariidge, 1913, p. 74, fig. Ix. (synonymy). 



Aglaopheitia f x, Hilgendorf, Trans. N.Z. Inst., xliii., 1910 (1911), p. 542, 

 fig. 4. 



The co-type of the species described by Hilgendorf under the rrame 

 of Aijlaojjlienia f x agrees exactly with the descriptions and figures of 

 Lytucarpns phoeiiiceiis, Busk. I, therefore, arrange the synonymy as above. 



Loc. — Denham Bay, Sunday Island, Kermadec Islands. 



17 Hilgendorf— Trans. N.Z. Inst., xliii., 1910 (1911), pp. 542, 543. fig. 4, 5. 



i» Bale— Cat. Austr. Hydfoid Zoophytes, 1884, p. 179, pi. xiii., fig. 6, pi. xvi., 

 fig. 7. 



19 Ritchie— Rec. Indian Mus., v., 1, 1910, p. 24, pi. iv., fig. 13, 14. 



