REPORT ON PHILIPPINE HYDROIDA 231 



produced into a nematophorous branch somewhat resembling the 

 one described above. In that species, however, there are a number 

 of hydrothecae borne on each hydrocladium, and the nematophorous 

 branch replaces a greatly modified mesial nematophore, while in the 

 present species the nematophorous branch is a continuation of the 

 hydrocladium itself. 



Type locality. — Davao Bay, Gulf of Davao, growing on a pearl 

 oyster, May 18, 1908. 



Holotype.— Cat. No. 42184, U.S.N.M. 



As this hydroid was found on a pearl oyster shell, it came from 

 relatively shallow water, probably from a depth not greater than 

 25 fathoms. 



AGLAOPHENIA MACGILLIVRAYI (Busk) 



Plumularia macgillivrayi Busk, Voyage of the Rattlesnake, 1852, vol. 1, 



p. 400. 

 Aglaophenia macgillivrayi Kirchenpauer. Ueber die Hydroidenfamilie 



Plumularidae, 1872, p. 27. 

 (?) Aglaophenia cupressina Lamouroux, Histoire des Polypiers Coralli- 



genes, 1816, p. 169. 



Allman 27 has given such a complete description and excellent fig- 

 ures of this species that further treatment seems unnecessary. The 

 great size of the mesial nematophores and the small size of the 

 hydrothecae as compared with the thickness of the hydrocladia are 

 characteristic features. The gonosome was a corbula entirely in 

 conformity with the true Aglaophenia type. 



Localities. — From Nogas Point, Panay, beach. Dredging station 

 5321, China Sea, vicinity of Formosa, Ibugos Island, 20° 19' 30" N., 

 121° 51' 15" E.; depth, 26 fathoms. Dredging station 5559, Jolo 

 Island and vicinity at Cabalian Point, 5° 51' 36" N., 121° 0' 45" E.; 

 depth 13 fathoms. Tonquil Island, Gumila Reef, depth not given. 

 Sabtan Island, November 8, 1908. Cataingan Bay, Dumurug Point, 

 April 18, 1908. 



Distribution. — Louisiade Archipelago, Australia (Busk) ; Simons 

 Bay, Cape of Good Hope (Allman) ; near Mindanao, Philippines 

 (Hargitt). 



This remarkable form has very large nematophores and nema- 

 tocysts which can be seen in the specimens secured, their threads 

 extending in bundles from the apertures of the nematophores. 



AGLAOPHENIA CALYCIFERA Bale 



Aglaophenia calycifera Bale, Report on the Hydroids collected in the Great 

 Australian Bight, etc., pt. 2, 1914, p. 178, pi. 37, figs. 3 and 4. 



A fragmentary specimen is referred with some doubt to this form. 

 The gonosome is absent. 



27 Challenger Reports, The Hydroids, pt. 1, 1883, p. 34, pis. 10 and 20, figs. 4-6. 



