158 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Occurrence — Continued. 

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



co. S. 

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



fathoms; co. S. 

 D. 5145. Jolo Light, Jolo; 6° 04' 30" N.; 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. (typical form 



and var. carinifera). 

 D. 5151. Sirun Island, Sulu Archipelago, Tawi Tawi Group; 5° 24' 



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

 D. 5577. Mount Dromedario, Tawi Tawi; 5° 20' 36" N. ; 119° 



58' 51" E.; 240 fathoms; crs. S. 

 Cotypes. — Cat. Nos. 7960, 7957, U.S.N.M. (var. carinifera.) 

 Holotype. — Cat. No. 8417, U.S.N.M. (var. crassa) 



MONOPORELLA TENUIMARGO, new species 



Plate 18, fig. 1 



Description. — The zoarium is unilamellar. The zooecia are dis- 

 tinct, separated by a furrow, large, somewhat elongated, elliptical; 

 the mural rim is very thin, salient, finely granulated, attenuated at 

 the base; the cryptocyst is shallow, carinated, convex, perforated 

 by extremely small, little apparent tremopores. The apertura is 

 large, terminal, transverse to the concave proximal border; two small 

 lateral indentations occur; the salient peristome bears six spines. 



Measurements . — 



. \ha = 0.18-0.20 mm. ~ . [2/2=1.25 mm. 



Aperturaj ^ _ ^^^ mm Zooeciaj fc _ Q gQ mm 



Affinities. — This large and beautiful species is very well charac- 

 terized. The carina is a very thin lamella the height of which de- 

 pends on the longitudinal cavity of the cryptocyst. Unfortunately 

 only the figured specimen has been found. The other species does not 

 appear to exist in this locality of much deeper water; the zooecial size 

 appears therefore in relationship to the depth as in certain genera of 

 the Microporidae. 



Occurrence. — D. 5574. Simaluc Island, north of Tawi Tawi; 5° 30' 

 45" N.; 120° 07' 57" E.; 340 fathoms. 



Holotype.— Cat. No. 7962, U.S.N.M. 



MONOPORELLA (?) WAIPUKURENSIS Waters, 1887 



Plate 38, figs. 6-8 



1887. Monoporella toaipukurensis Waters, On Tertiary Chilostomatous Bryozoa 

 from New Zealand, Quarterly Journal Geological Society London, vol. 

 43, p. 50, pi. 6, fig. 11. 



Description. — The zoarium is bilamellar; the two lamellae are 

 placed back to back. The zooecia are distinct, separated by a deep 



