342 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Zooecia 



\Lz -=0.45 mm. 



Measurements. — 



-d . , • {%? =0.08-0.10 mm. 



PeriStomiCe U/=0.07-0.09 mm. ~ "\U =0.25 mm. 



Variations. — The variations are very large. The greater part of 

 the zooecia are without avicularia and are separated by a salient 

 thread. When it appears, the frontal avicularium does not have a 

 fixed position, but it is always attached to the proximal border of the 

 peristome. The large avicularia are very rare, isolated or in groups^ 

 they are narrow or somewhat falciform; the beak is very thin. The 

 mandible is slightly unguiculate at its extremity. The areolar pores 

 are numerous. The frontal is granulose and often bears two isolated 

 pores. 



Biology. — The large avicularia are most frequent at Romblon, 

 The specimens from great depths (Mompog) were identical with those 



A' 



Fig. 139. — Family Smittinidae Levinsen, 1909 

 A. Smittina trispinosa nitida Hincks, 1881. Section X25 through a cylin- 

 drical zoarium at the base of the basal lamella. The special method of gem- 

 mation explains the great zooecial irregularity. B. Smittina trispinosa munita 

 Hincks, 1884. Mandible of median avicularium, X85. C, D. Ramphostomella 

 sollers, new species. Two avicularian mandibles, X85. 



from Romblon and we have used them for the preparation of the 

 mandible. In the other localities, the large avicularia are very rare. 

 It must be that the waters here are less calm. 



The species was in reproduction from February to April, 1908 

 (36-970 meters). The depth of water has no influence on the time 

 of reproduction. 

 Occurrence. — 



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



fathoms; S. Sh. 

 D. 5147. Sulade Island, Sulu Archipelago; 5° 41' 40" N.J 120° 



47' 10" E.; 21 fathoms; co. S., Sh. 

 D. 5179. Romblon Light, Romblon; 12° 38' 15" N.; 122° 12' 

 30" E.; 37 fathoms; hrd. S.; 24.6° C. 



