BRYOZOA OF THE PHILIPPINE REGION 471 



Occurrence — 



D. 5137. Jolo Light, Jolo; 6° 4' 25" N.; 120° 58' 30" E.; 20 



fathoms; S. Sh.; 

 D. 5251. Gulf of Davao, Linao Point; 7° 5' 12" N.J 125° 39' 



35" E.; 20 fathoms; Co.; 

 Indian Ocean: Mauritius. 

 Plesioty pes. —Cat. Nos. 8263, 8264, U.S.N.M. 



CHAPERIA PYRIFORMIS, new species 



Plate 64, fig. 1 



Description. — The zoarium is unilamellar. The zooecia are distinct, 

 separated by a deep furrow, imbricated, pyrijorm; the frontal is 

 anterior, concave, very small. The aperture is elongated and pyri- 

 jorm; the peristone is very thick and bears 4 to 6 large articulated 

 spines. The ovicell is large, globular, hypers tomial, smooth. 



Measurements. — 



fk = 0.40mm. „ . JZz = 0.70mm. 



Apertureu „ nn Zooecia, _ . 



1 Ua = 0.26mm. Uz = 0.34 mm. 



Affinities. — This new species differs from Chaperia transversalis in 



its pyriform aperture and in the lateral arrangement (and nondistal) 



of its peristomial spines. We have not observed the trabeculae at 



the bottom of the aperture, but our specimens were dead. 



Occurrence. — 



D. 5577. Mount Dromedario, north of Tawi Tawi; 5° 20' 36" 



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



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



119° 9' 52" E.; 175 fathoms; fine S., co.; 13° C. 



Eolotype.—C&t. No. 8265, U.S.N.M. 



wall of several zooecia; m, mesentery-like lamella of chitin connecting the proxi- 

 mal part of the basal wall of the zooecium with the basal epitheca. F. Labium, 

 seen from the distal side. G. Open operculum (op.) and labium (I. b.) in side 

 view; cond. chitinous lamella covering the condyle (decalcified); scl., sclerite 

 surrounding the cavity in which the operculum lies; c, beginning of floor of 

 compensatrix; vest, entrance to vestibule. H. Closed operculum and labium; 

 occl. occlusor muscles, div. divaricator muscles. (For X, see fig. M.) I. Longi- 

 tudinal section (thick) of a zooecium; b. ep., basal epitheca. ep. c, cavity beneath 

 epitheca;/. 6. a bar belonging to the frontal shield. J. Distal part of the opercu- 

 lum with the labium (lb), seen a thick transverse section of the zooecium (not 

 decalcified). The condyles (cond.) are in the foreground, and the part of the 

 operculum immediately connected with them (fig. L) is not indicated. The 

 labium and the edge of the operculum are seen at a much deeper focus; p. pores- 

 K-N. Transverse sections of opercula. K. On the distal side of the condyle, 

 showing the great extent of the vertical lateral flanges and the free termination 

 of the buttresses of the operculum. L. Through the region of the condyles; 

 the operculum is partially open. M. On the proximal side of the condy.es; 

 showing the way in which the circular marks (X) which appear in fig. D are 

 formed. N. Immediately distal to the basal sclerite. (A-N. After Harmcr 

 1902.) 



