94 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Genus MEMBRENDOECIUM Canu and Bassler, 1917 



MEMBRENDOECIUM SAVARTI MacGillivray, 1890 



Plate 6, figs. 1, 2 



1891. Biflustra savarti MacGillivray, Description of new or little known 

 Polyzoa, Transactions Royal Society of Victoria, p. 79, pi. 9, fig. 6. 



1895. Membranipora savarti MacGillivray, Tertiary Polyzoa of Victoria, 

 Transactions of the Royal Society of Victoria, vol. 4, p. 38, pi. 5, 

 figs. 6, 7. 



Measurements. — 



Opesium{^-°-2 4 -°f mm ' Zooecium{^ = °; 40 - - 42 """• 



F \lo = 0.16-0.20 mm. Uz = 0.30 mm. 



Variations. — MacGillivray erroneously identified this species with 

 Acanthodesia savarti Audouin, 1826, but the latter has never shown 

 either ovicell or avicularium. 



Our specimens are always incrusting very irregular substrata, 

 shells, bryozoa, nullipores, algae, and their photography is very diffi- 

 cult. They have been collected among the innumerable isles of the 

 Sulu Archipelago. 



The ovicell is small, endozooecial, little visible. The ectocyst is 

 colored green and hides the ovicells. The small avicularia are erect, 

 salient, very fragile; their beak is often broken. 



We have had the fortune to discover in a lot of fossils from the 

 Miocene of Muddy Creek, Australia, two superb specimens in which 

 the ornamentation is absolutely identical with that of a small variety 

 from D. 5141 which we designate as variety minor (pi. 6, fig. 1). 

 Occurrence. — 



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



fathoms; S. Sh. 

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



co. S. (var. minor). 

 D. 5144. Jolo Light, Jolo; 6° 05' 50" N.j 121° 02' 15" E.; 19 



fathoms; co. S. 

 D. 5151. Sirun Island, Sulu Archipelago, Tawi Tawi Group; 5° 

 24' 40" N.J 120° 27' 15" E.; 24 fathoms; co. S., Sh. 

 D. 5162. Tinagta Island, Tawi Tawi Group; 5° 10' N.j 119° 



47' 30" E.; 230 fathoms; S. brk. Sh.; 11.6° C. 

 D. 5577. Mount Dromedario, north of Tawi Tawi Group; 

 5° 20' 36" N.J 119° 58' 51" E.; 240 fathoms; crs. 

 S.J 12.4° C. 

 Geographic distribution. — West Australia (MacGillivray, 1890). 

 Geologic distribution. — Miocene of Australia (MacGillivray, 1895). 

 Plesiotypes. —C&t.<Nos. 7865, 7866, U.S.N.M. 

 Holotype — Oat. No. 7864, U.S.N.M. (var. minor). 



