BRYOZOA OF THE PHILIPPINE REGION 553 



Variations. — This species is very constant in the ensemble of its 

 characters. Only the size of the pores varies from one ovicell to 

 another. With three peristomes to a line, the outermost is often 

 isolated, the two others remaining adjacent. 



In longitudinal section the thickness of the funiculus is exhibited 

 by a very thick epitheca. It is therefore not possible to study the 

 nature of the frontal pores and to learn if they are mesopores or 

 vacuoles. 



Affinities. — The ovicell appears to have the structure of Hornera, 

 but as it is perforated by lateral tubes it belongs more to the genus 

 Polyascosoecia, in which the ovicell is always frontal. 



This species differs from Hornera Tiochstetteriana Stoliczka in its 

 frontal and not dorsal ovicell, in the presence of a longitudinal funicu- 

 lus in the shorter peristomes never projecting beyond the dorsal, and 

 in the presence of three tubes to the line and not 4 or 5. 



Biology. — This is a species very easily determined. Its certain 

 presence in the vicinity of the Pacific and in the China Sea seems to 

 indicate a greater geographic distribution. Its bathymetric distri- 

 bution is rather great but it is always very rare. We have found 

 only a dozen fragments in the dredgings made in the vicinity of the 

 Jolo Islands. The ovicells are frequent, and it is therefore a prolific 

 species. The rarity of specimens can be explained only by a great 

 fragility of the larvae. The larvae of other species of this genus 

 must be more vigorous, since the genus has existed since the Cre- 

 taceous. 



The presence of Polyascosoecia in the fossils seems always to indi- 

 cate warm waters. 

 Occurrence. — 



D. 5141. Jolo Light, Jolo; 6° 9' N.; 120° 58' E.; 29 fathoms; 



co. S. (common). 

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



fathoms; co. S., Sh. 

 D. 5478. Tacbuc Point, Leyte; 10° 46' 24" N.; 125° 16' 30" 



E.; 57 fathoms; Sh. 

 D. 5579. Sibutu Island, Darvel Bay, Borneo; 4° 54' 15" N.; 



• 119° 09' 52" E.; 175 fathoms; fine S., co.; 13° C. 

 D. 5580. Sibutu Island, Darvel Bay, Borneo; 4° 52' 45" N.J 

 119° 06' 45" E.; 162 fathoms; br. S., Co.; 13.2° C. 

 Cotypes.— Cat. No. 8413, U.S.N.M. 



Genus CRISINA D'Orbigny, 1850 



CRISINA CANARIENSIS D'Orbigny, 1851 



Plate 87, figs. 8-18 



1851. I dmonea canariensis D'Orbigny, Pal<5ontologie francaise, Terrains cr^taces, 



vol. 5, p. 732. 

 1872. Idmonea hochsletteriana Smitt, Floridan Bryozoa Kongl. Svenska Veten- 



skaps-Akademiens Handlingar, vol. 10, p. 6, pi. 11, figs. 11-13. 



