BRYOZOA OF THE PHILIPPINE REGION 539 



The tubes are almost always visible on the dorsal and separated 

 by slight longitudinal furrows. They are wrinkled transversely. 

 Although the calcification is somewhat accentuated, when the light 

 is very strong, the transverse wrinkles are alone visible and decorate 

 the zoarial surface. 



The base is a Proboscina creeping on a shell; the free branches are 

 supported by small columns and spread out horizontally; they are 

 never erect. Figure 2a of Kirkpatrick illustrates perfectly the 

 colonial ensemble and the utility of the small columns. The branches 

 are very rarely united by transverse trabeculae (= cross connections 

 of Harmer). The peristomes are grouped in oblique series but never 

 in true fascicles; very rarely the peristomes are adjacent. We have 

 found, however, a superb ovicelled specimen of beautiful clear rose 

 color in which the tubes are grouped in fascicles. We classify it 

 as the type of the new variety jasciculata, for we are not able to 

 discover other distinctive characters. (PI. 82, fig. 6.) 



The micrometric measurements are rather constant. We have, 

 however, found always in the same locality Tacbuc specimens with 

 smaller dimensions which we have separated a new variety minor. 

 (PI. 82, figs. 7, 8.) 



Affinities. — Kirkpatrick, 1890, described from the China Sea. 

 Idmonea pulcherrima with characters very close to the present species, 

 which, however, differs in its expanded and not cylindrical peristomies, 

 in its oval and not circular peristome, in its orthogonal oeciostomes 

 and not in urn-shaped structure, and in the absence of numerous 

 trabeculae between the zoarial branches. Harmer, 1915, has re- 

 discovered numerous specimens of Idmonea pulcherrima in the 

 materials from Siboga in the province of Malasia, to the south of 

 the Philippines; he has been able to study the variations and to 

 prove that the trabeculae are not constant, that the oeciostome can 

 be orthogonal, that the peristomies are sometimes expanded and that 

 the peristomes are not always orbicular. From these comparisons 

 it results that Diaperoecia radicata is very probably identical with 

 D. pulcherrima. Although our specimens are very numerous, we 

 have never observed trabeculae or oeciostomes in urn-shaped struc- 

 ture. We believe that the two species can be maintained provi- 

 sionally. Harmer indicates in the synonymy of Diaperoecia pulcher- 

 rima, Idmonea inter juncta Waters 1887 and 1914 (not MacGillivray, 

 1886) and Idmonea milneana Thornely, 1905. 



Another species very close but not identical is Idmonea milneana, 

 Smitt, 1872 (not D'Orbigny, 1838) from the Gulf of Mexico. Ac- 

 cording to the figures of Smitt the identity is almost complete; 

 only the peristomies do not always expand and the number of tubes 

 is greater. Our specimens from the Gulf of Mexico are not in a 

 good state of preservation and do not permit of close comparison. 



