BRYOZOA OF THE PHILIPPINE REGION 153 



This is as remarkable a species as it is bizarre. The larvae were 

 affixed at the end of October, 1908. Our specimens were living. 



Occurrence. — D. 5311. China Sea, vicinity Hong Kong; 21° 33' N.; 

 116° 15' E.; 88 fathoms; crs. S., Sh. 



Cotypes.— Cat. No. 7956, U.S.N.M. 



THALAMOPORELLA EXPANSA Levinsen, 1909 



Plate 17, fig. 5 



1909. Thalamoporella expansa Levinsen, Morphological and Systematic Studies 

 Cheilostomatous Bryozoa, pp. 179, 190, pi. 65, tig. 5. 



192G. Thalamoporella expansa Harmeii, Polyzoa Siboga Expedition, p. 300,pl. 20, 

 figs. 2, 3.9, 10. 



Description. — The zoarium encrusts nullipores. The zooecia are 

 distinct, united b} 7 their mural rim, large, elliptical, little elongated; 

 tjie mural rim is salient, thin, granulated; the cryptocyst is shallow, 

 flat, much granulated and perforated by very small pores. The 

 aperture is transverse, semielliptical; the peristome is thin, very little 

 salient and bears two large, hollow, lateral tuberosities. Above 

 each aperture there is a cavity. The opesiules are small, rounded, 

 placed at the base of the ascending portion of the cryptocyst. 



Measurements. — 



. f/ta = 0.10-0.12 mm. „ . \Lz = 0.80-1.00 mm. 



Aperture l7 Zooecia,, 



lto = 0.20 mm. lis = 0.60 mm. 



Affinities. — The operculum is bordered by a thick sclerite and its 

 proximal border is slightly concave. 



As in Thalamoporella this species has opesiules and oral tuberosities; 

 the operculum is also very similar; but we have not observed either 

 the ovicell or the characteristic hooks. Similarly as in Steganoporella 

 the zooecia have a distal cavity, but we have not observed the poly- 

 pidian tube. 



Levinsen names the curious distal concavity the aureola. It is 

 placed on the frontal of the superior zooecium where the cryptocyst 

 is often covered by a thin calcareous epitheca. It is covered by the 

 ectocyst which often forms at the same place a salient, hollow cushion. 

 It simulates thus a sort of small distal hypostege. 



Our micrometric measurements are in perfect accord with those of 

 Harmer but not with Levinsen. Levinsen and Harmer have described 

 an avicularium with triangular mandible. Our specimens do not 

 show this. 



Our three specimens are very small and we have not been able to 

 make detailed observations. The specimens were dead but still con- 

 tained some opercula. 



Occurrence.— D. 5137. Jolo Light, Jolo; 6° 04' 25" N.; 120° 58' 

 30" E.; 20 fathoms.; S., Sh. 



Plesioty pes. —Cat. No. 7957, U.S.N.M. 



