424 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



is longer in the concave parts of the zoarium and much shorter in the 

 convex parts. 



MacGillivray has well studied this species and our photographs 

 simply confirm his admirable drawings. 



Affinities. — The differences from Holoporella tridenticulata are 

 difficult to make out for the specimens are not absolutely complete. 

 The present species differs, however, in its longer avicularian beak, 

 in the beak of the interzooecial avicularia serrate and never elevated 

 above the zooecial plane, in the absence of long cylindrical beaks and 

 in the somewhat larger micrometric measurements. 



The two species often live together and the separation of the 

 specimens is very delicate; they are possibly two varieties of the same 

 species. 



Biology. — Almost all our specimens were dead. That is generally 

 the case, however, for all the Cellepores, as the life of a colony is never 

 very long. 



The geographic distribution of this species in the region is large. 

 Moreover it has been found in Australia by MacGillivray. This 



O'O O 



Fig. 166.— Genus Holoporella Waters, 1909 



A, B. Holoporella servatirostris MacGillivray, 1884. A. Operculum X85. 

 B. Large oral articulated spines, X85, showing structure. C-F. Holoporella 

 erectorostris Busk, 1881. C. Mandible, X85. D, E, F. Three forms of oper- 

 cula, X85; the last a rare occurrence. 



distribution is moreover in relationship with its bathymetric distribu- 

 tion because it has been dredged as deep as 240 fathoms and can live 

 at a temperature of more than 12° C. 

 Occurrence. — 



D. 5141. Jolo Light, Jolo; 6° 9' N.; 120° 58' E.; 29 fathoms; 



co. S. 

 D. 5145. Jolo Light, Jolo; 6° 4' 30" N.j 120° 59' 30" E.; 23 



fathoms; co. S., Sh. 

 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° 58' 15" N.J 122° 12' 



30" E.; 37 fathoms; hard S.; 24.2° C. 

 D. 5478. Tacbuc Point, Leyte; 10° 46' 24" N.; 125° 16' 30" E.; 

 57 fathoms; Sh. (common). 



