BKYOZOA OF THE PHILIPPINE REGION 165 



mella in the vicinity of which are two complete opesiules. The en- 

 dotoichai ovicell is small, convex, transverse; it opens by a round 

 pore closed by a broken-down operculum; it is ornamented by two 

 lateral slits covered by the ectocyst. At the base of some zooecia 

 there is a falciform avicularium. The mural rim bears a crown of 6 

 spines. 



Measurements. — 



„ ffco = 0.12mm. v , f Lz = 0.90-1.75 mm. 



Opesium( Zo = 30 mm Zooecla (zz = 0.60-0.50 mm. ^ 



Structure. — A light colored thick ectocyst covers the zooecia, hiding 

 the mural rim, the opesiules, and the slits of the ovicell, but allowing 

 one to perceive the broken down operculum of the ovicell and the 

 zooecial operculum attached 



to the ectocyst. The oper- / ^ ::===:: %. /~\ 



culum is thin, semielliptical {/ \ \ / 



transverse, bordered with a •"" " v 



ft 



double sclerite. Two lateral ° C 



indentations, corresponding Fig. 44. — Opercula, X85. A. Entomaria coro- 

 to the opesiules bear the nata, new species. B. Trypostega pusilla, 



, t ,i • | new species. C. Haswellia avslraliensis 



trace ot the opesiular mus- T , ., 1C) __ 



1 tu- • X, t Haswell, 1880 



cles. 1 his is the same form 



as in Aspidostoma and Cellaria. The communication of the ovicell 

 with the zooecia is established by three septulae. 



Affinities. — This species differs from Entomaria (Lagarozoum) 

 profunda Harmer, 1926, in its superficial cryptocyst and in its more 

 salient and more visible ovicell. 



Biology. — Some of our specimens were living. Reproduction oc- 

 curred in February, 1908. 

 Occurrence. — 



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



co. S. 

 D. 5151. Sirun Island, Tawi Tawi Group; 5° 24' 40" N.; 120° 

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

 Ilolotype— Cut. No. 7965, U.S.N. M. 



Family CHLIDONIIDAE Busk, 1884 



The jointed colonies, springing from a stolonate network consist of 

 a stem, two main branches and a number of zooecia-bcaring secondary 

 branches, and besides the zooecia we may distinguish between three 

 different forms of kenozooecia, namely, the partitions of the stolon, 

 the stem internodes and the bifurcate internodes of the main branches. 

 Moreover, the main branches and the secondary branches may be 

 transformed into zooecia. The zooecia, which lack pores and spines, 

 have a deeply depressed cryptocyst, pierced by a small transverse slit, 

 2182—29 12 



