234 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



given by Bale in his Australian Hydroid Zoophytes, both as to the 

 trophosome and gonosome, excepting that the hydrothecal margins 

 are more strongly dentate than is represented by him; but occa- 

 sional hydrothecae have teeth reduced to the extent represented in 

 some of Bale's figures. 



The gonosome is almost identical with that of Lytocarpus hawai- 

 ensis Nutting. 28 But the hydrothecae are quite different in form. 



Localities. — Dredging station 5249, Gulf of Davao, Lanang Point, 

 7° 6' 6" N., 125° 40' 8" E. ; depth, 23 fathoms. Station 5321, China 

 Sea, vicinity of Formosa, Ibugos Island, 20° 19' 30" N., 121° 51' 

 15" E.; depth, 26 fathoms. Station 5642, Buton Straits, Tikola 

 Peninsula, 4° 31' 40" S., 122° 49' 42" E.; depth, 37 fathoms. 



The specimen from station 5249 has hydrothecae which agree quite 

 exactly with the figures given by Bale ; therefore the species appears 

 to be correctly identified. 



Distribution. — Australia, Prince of Wales Channel (Busk) ; vari- 

 ous Australian points (Bale) ; Singapore (Kirchenpauer) ; Amoy 

 Island (Swoboda) ; Japan (Arrotz) ; Indian Ocean (Swoboda) ; 

 Sagami Sea, Japan (Inaba) ; Hawaiian Islands (Nutting). 



LYTOCARPUS SPECTABILIS Allman 



Lytocarpus spectaoilis Allman, Report on Hydroida of the Challenger 

 Expedition, pt. 1, 1883, p. 43, pi. 15. 



The trophosome only is found in our specimens, but it agrees quite 

 exactly with Allman's description and figures. 



Locality. — Dredging station 5150, Sulu Archipelago, vicinity of 

 Siasi, Sirun Island, 5° 23' 20" N., 120° 35' 45" E.; depth, 21 fathoms. 



Distribution. — The types were taken by the Challenger from Zam- 

 boanga, Philippines, and Torres Strait (Allman). So far as I know, 

 this species has not been reported since its original discovery by 

 Allman. 



LYTOCARPUS PENNARIUS (Linnaeus) 



Sertularia pennaria Linnaeus, Systema Natura, 1758, p. 813. 



Lytocarpus secundus Allman, Challenger Reports, the Hydroids, Part 1, 



The Plumularidae, 1883, p. 42. 

 Afflaophenia (Lytocarpia) secunda Kibchenpauer, Ueber die Hydroiden- 



familie Plumularidae, 1872, p. 35. 

 Lytocarpus haicaiensis Nutting, Hydroids of the Hawaiian Islands, J. 905, 



p. 954. 

 Lytocarpus pennarius Ritchie, Hydroids of the Indian Museum, 1910, p. 



19. 



This appears to be an exceedingly variable species, particularly in 

 the shape of the hydrothecae. In the specimen at hand, individual 

 hydrothecae can be found to match the drawings of this form made 



28 Hydroids of the Hawaiian Islands, 1905, p. 945, pi. 12, fig. 12. 



