280 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Measurements. — 



Apertural^ a = -25 mm. Ordinary \Lz = 0.95-1.10 mm. 



l?a = 0.17 mm. zooecia (Z2 = 0.60-0.65 mm. 



Ovicelled zooecia JZ,2= 1.50 mm. ^ rtura J7wi = 0.20 mm. 

 (including ovicell)[Z2 =0.75 mm. [Z2 = 0.20 mm. 



Affinities. — The micro-metric measurements are quite variable and 

 vary much according to the irregularity of the substratum. We 

 know the New Zealand species only from Waters' figure of 1887. 

 Our specimens are very closely allied to it and differ only in their 

 separating thread much less salient and scarcely visible; the micro- 

 metric measurements are very close. We do not believe that a new 

 species should be created but it is possible that a better study of the 

 fossil form will show differences invisible on Waters' figure. G. 

 rostrigera differs from G. biturrita Hincks, 1885, in its much smaller 

 and marginated ovicell, and in its less salient avicularia. 



Biology. — Our specimens were living and in reproduction (ovicelled) 

 February 15, 1908. Unfortunately our specimens from the China 

 Sea were dead and deprived of chitinous appendages. We are ignorant 

 therefore of the duration of reproduction. 



Fia. 115. — Gephyrophora rostrigera Waters, 1885 



A-C. Different form of opercula of ordinary zooecia, X85. D-F. Three 

 opercula, X85, of ovicelled zooecia. 



Occurrence. — 



D. 5137. Jolo Light, Jolo; 6° 04' 25" N.; 120° 58' 30" E.; 20 



fathoms; S. Sh. 

 D. 5141. Jolo Light, Jolo; 6° 09' N.; 120° 58' E.; 29 fathoms; 



co. S. 

 D. 5147. Sulade Island, Sulu Archipelago; 5° 41' 40" N.; 120° 



47' 10" E.; 21 fathoms; co. S. Sh. " 

 D. 5179. Romblon Light, Romblon; 12° 38' 15" N.; 122° 12' 



30" E.; 37 fathoms; hard S. 

 D. 5311. China Sea, vicinity of Hong Kong; 21° 33' N.; 116° 15' 



E.; 88 fathoms; crs. S., Sh. 

 Plesioty pes. —Cat. Nos. 8029-8032, U.S.N.M. 



