BRYOZOA OF THE PHILIPPINE REGION 137 



Measurements. — 



~ . f^o = 0.25mm. „ . \Lz =0.70 mm. 



Opesium^ 7 Zooecium,, cc 



^ uo = 0.25 mm. U2 = 0.65 mm. 



Structure. — The general trifoliate aspect of the opesium and the 

 absence of onychocellaria caused us to classify our first specimens in 

 Floridinella, but the discovery of the ovicell which is perfectly 

 identical with that of the genotype, Caleschara denticulata Mac- 

 Gillivray, 1869, obliges us to introduce the species in Caleschara. 

 The differences, polypidian convexity shorter and opesiules united 

 to the opesium are in reality only differences in calcification. 



The opercular valve is supported on the distal border of the mural 

 rim but it is detached from it laterally. The ectocyst is thick and 

 of a beautiful flesh color; it is often pigmented with green on the same 

 zoarium. 



Affinities. — This species differs from Caleschara levinseni Harmer, 

 1926, from the Malay region in its much wider zooecia (0.65 mm. 

 and not 0.50 mm.) in its shorter polypidian lamella and in its ovicell 

 placed on a zooecium with ordinary and reduced cryptocyst. 



This species reveals the structure of the two Lower Eocene species 

 Planicellaria eocena Pergens, 1886, and Membranipora squamosa 

 Pergens, 1886. The first provided with avicularia and articulated 

 can be maintained in a closely related but distinct genus which, how- 

 ever, is not at all D'Orbigny's genus. 



Biology. — Many specimens were living; they were in reproduction 

 on the loth of February, 1908. The large dimensions of this species 

 as well as its vigorous bundles of opesiular muscles permit it to resist 

 the great depth, for it has been dredged as deep as 551 meters. 

 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. 5217. AnimaSola Island, between Burias and Luzon; 13° 20' 

 N.; 123°14'15"E.; 105 fathoms ; crs. gy S.; 17.2° C. 

 D. 5574. Simaluc Island, N. of Tawi Tawi; 5° 30' 45" N.; 

 120° 07' 57" E.; 340 fathoms. 

 Cotypes — Cat. Nos. 7940, 7941, U.S.N.M. 



Genus MICROPORA Gray, 1848 



MICROPORA RIMULATA, new species 



Plate 1 1, fig. 4 



Description. — The zoarium encrusts pebbles. The zooecia are 

 distinct, adjacent through their mural rim, ogival, a little elongated or 

 transverse; the mural rim is thin and little salient; the cryptocyst is 



