BRYOZOA OF THE PHILIPPINE REGION 343 



D. 5219. Mompog Island, between Marinduque and Luzon; 



13° 21' N.; 122° 18' 45" E.; 530 fathoms; gn. M. 

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

 119° 58' 51" E.; 240 fathoms; crs. S.; 12.4° C. 

 Geographic distribution. — Pacific; Victoria and Green Point, Australia. 

 Plesioty pes. —Cat. No. 8118, U.S.N.M. 



SMITTINA TRISPINOSA var. NITIDA Hincks, 1881 



Plate 41, figs. 6-12 



1881. Smittia nitida Hincks, Contribution to general history Marine Polyzoa, 

 Annals and Magazine Natural History, ser. 5, vol. 1, p. 159, pi. 9, fig. 5. 



Measurements. — 



Peristomice^ ^°- 09 mm " Zooeciajf z =°- 50 mm - 



Up -0.08-0.09 mm. Uz -0.30 mm. 



Corrections. — Waters, 1909, classed this variety of Hincks, 1881, in 

 the variety protecta Thornely, 1905, in which the peristomice bears a 

 constant and well outlined sinus. Certainly this was a slip of the 

 pen, for it is the variety spathulata Hincks, 1884, which much resem- 

 bles his figure of the variety protecta. 



Description. — The peristomice is suborbicular; the proximal border 

 is straight or somewhat concave. The lyrula is broad; the two car- 

 delles are small, triangular and placed at the same height as the 

 lyrula. The small avicularia are elliptical and placed at the side of 

 the aperture. The large avicularia are lateral; they are attached at 

 the side of the aperture; their beak is spathulate, very broad and 

 turned toward the base. The separating thread of the zooecia is 

 salient. The frontal is finely granulated. The ovicell is globular, 

 as large as the peristomice. 



Variations. — The variations are numerous and somewhat regular 

 specimens are very rare; the latter are often unilamellar. The zoa- 

 rium encrusts Orbitoides, fragments of shells, bryozoa, especially 

 (Adeonellopsis and Retepores). The zooecial length varies from 

 one to twice on the same colony; the giant zooecia bear small sporadic 

 avicularia. It is likewise with the zooecial width. The zooecia are 

 generally poorly oriented and are sometimes even entirely reversed. 

 Finally the intensity of calcification can render specimens almost 

 unrecognizable. The peristomice is oval or transverse; but there is 

 never a pseudorimule clearly indicated on the peristome. The ovicell 

 is never more than 0.25 mm. in diameter. 



Zooecia without avicularia are the most frequent. The latter are 

 inconstant in form and position, but the beak is always enlarged at 

 the extremity in the large forms. Finally there is hardly a single 

 zooecium resembling its neighbor. 



