490 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



4 millimeters. The dimensions of the aperture are equally variable 

 according to their position on the colony; the dimensions indicated 

 are those of the largest zooecia. We have observed some special 

 zooecia with very large orifice. The small superficial ornament 

 disappears with the least wear and each aperture appears to be 

 accompanied by 6 large irregular pores. The operculum is very 

 thin, with a very wide triangular rimule. The meridianal section 

 shows a large number of inner rectangular zooecia arranged in a 

 dozen longitudinal rows. The transverse section is very regular 

 and shows the interior polygonal zooecia. 



Affinities. — In the aspect of the base, in the form of the avicularia 

 and in the arrangement in quincunx of the apertures, this species 

 resembles Conescharellina angulopora T. Woods, 1880 but differs in 

 its transverse and not elongated aperture and in the presence of a 

 very large rimule to the operculum. 



Biology. — This is a species special to slight depths for we have 

 found only a single specimen at Tinagta (230 fathoms). AH the 

 localities observed are more or less sandy. 



Finally it has been observed only in the Sulu Archipelago and its 

 geographic distribution is very small. 

 Occurrence. — 



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



fathoms; S. Sh. 

 D. 5141. Jolo Light, Jolo; 6° 09' N.; 120° 58' E.; 29 fathoms; 



co. S. 

 D. 5144. Jolo Light, Jolo; 6° 05' 50" N.; 121° 02' 15" E.; 19 



fathoms; co. S. 

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



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

 D. 5151. Sirun Island, Sulu Archipelago; 5° 24' 40" N.; 120° 



27' 15" E.; 24 fathoms; co. S. Sh. 

 D. 5162. Tinagta Island; 5° 10' N.; 119° 47' 30" E.; 230 

 fathoms; S. brk, Sh. crs.; 11.6° C. 

 Cotypes.— Cat. Nos. 8288-8291, U.S.N.M. 



CONESCHARELLINA OBLIQUA, new species 



Plate 68, figs. 1-3 



Description. — The zoarium is conical, small, somewhat higher 

 than broad; the apex is obtuse. The zooecia are arranged in oblique 

 rows and in quincunx. The aperture is suborbicular with a large 

 distal semicircular sinus; the peristome is very little visible; the 

 proximal pore is distant from the aperture. Tho avicularia are 

 elliptical, with pivot and arranged alternately between the oblique 

 rows of the aperture. The base is entire or a little cronulated at the 

 periphery; the cellules form here wide convex, co^tules radially 

 arranged around a small central pore. 



