430 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Occurrence. — 



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



fathoms; S. Sh. 

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



30" E.; 37 fathoms; hard S.; 24.2° C. 

 Plesiotypes. —Cat. Nos. 8250-8252, U.S.N. M. 



Genus SCHISMOPORA MacGillivray, 1888 



SCHISMOPORA CHRYSALIS, new species 



Plate 62, figs. 11, 12 



Description. — The zoarium is large, fusiform, hollow, encrusting 

 fine radicells of algae; the surface is mammillated; the salient por- 

 tions are black, while the remainder is 

 rose brown. The zooecia are very erect, 

 almost orbicular; the frontal is granular 

 and surrounded by scattered areolar pores. 

 The aperture is semielliptical, somewhat 

 transverse, with a very wide concave proxi- 

 mal rimule; the peristomice is orbicular and 

 frequently bears a narrow rimule bordered 

 on one side by an avicularian umbo. The 

 ovicell is globular, surrounding the aperture 

 which it partially covers, granular and 

 perforated by very small tremopores; its orifice is very large and 

 is not in agreement with the operculum. The aperture of the deep 

 zooecia is only visible. The zoarial avicularia are elongated, ellip- 

 tical; their beak is rounded, non salient; their mandible is slightly 

 spa tula te. 



Mea sure me nts . — 



lha = 0.l0 mm. v • (1,2 = 0.50 mm. 



Aperturaj, Zooecia^ 



Fig. 169. — Schism opora 

 chrysalis, new species. 

 Operculum and mandible, 

 X85 



[Za = 0.12 mm. ""1^2 = 0.40 mm. 



Affinities. — The avicularian beak is very inconstant in form and 

 position; it is sometimes little visible. The operculum is very thin: 

 it bears a sinuous proximal border and two muscular attachments 

 little distant from the border. 



The form of the colony recalls the chrysalis of many insects; our 

 largest specimen attained a length of 5 cm. It is rather difficult to 

 conceive how so large colony can hold in equilibrium on such a 

 minute radicell. 



Biology. — Our specimens were in reproduction March 5, 1908 (36 

 meters). 



