BRYOZOA OF THE PHILIPPINE REGION 341 



Variations. — The nature of the avicularia especially is very variable 

 and gives to each variety a special aspect. They are acuminated and 

 ascendant (directed upward) or quite elliptieal or oval and descendant 

 (directed downward). They are again small or gigantic. Finally 

 they appear in the vicinity of the aperture or they may be irregularly 

 disseminated on the frontal. But the greater part of the time they 

 are absent. A special combination of these different characters 

 marks each variety. The ascendant avicularia are the more abundant 

 in the northern seas while the descendant avicularia occur more fre- 

 quently in the equatorial seas. 



TYPICAL FORM 



1880. Smittia trispinosa Hincks, British Marine Polyzoa p. 353, pi. 49, figs. 1-8. 

 1912. Smittia trispinosa Osburn, Bryozoa of Woods Hole region, Bull. Bureau 

 Fisheries, vol. 30, p. 246, pi. 27, fig. 65. (Variation.) 



Measurements. — 



Peristomice!^ =°- 10 mm ' Zooecia!^ -0-50-0.60 mm. 



Up -0.08 mm. U2 = 0.25-0.30 mm. 



Description. — The peristomice is oval and bears a false, small, 

 proximal rimule. The lyrula is broad. The ovicell bears two or 

 three large pyriform punctures. The avicularium is triangular, 

 ascendant; it is placed in the vicinity of the aperture. 



The typical form, very frequent in the temperate seas is very rare 

 in the Philippine waters. Our specimens were dead. 

 Occurrence. — 



D. 5145. Jolo Light, Jolo; 6° 04' 30" N.; 120° 59' 30" E.; 23 



fathoms; co. S., Sh. 

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

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

 Plesioty pes. —Cat. Nos. 8116, 8117, U.S.N.M. 



SMITTINA TRISPINOSA var. MUNITA Hincks, 1884 



Plate 41, figs. 4, 5 



1884. Smittina trispinosa var. munita Hincks, Contributions to history Marine 

 Polyzoa, Annals Magazine Natural History, ser. 5, vol. 14, p. 134, 

 pi. 9, fig. 5. 



1889. Smittina trispinosa var. munita Watehs, Bryozoa from New South Wales, 

 Annals Magazine Natural History, ser. 6, vol. 4, pi. 3, fig. 12. 



There is a wide lyrula and two small cardelles placed at the same 

 height. The frontal avicularium is adjacent to the proximal border 

 of the peristomice. The peristomice bears a rather deep proximal 

 sinus. The large avicularium is straight or somewhat falciform; 

 the beak is pointed and never spathulate; it is always somewhat re- 

 moved from the separating thread of the zooecia. 

 2182—29 23 



