94 UNITED STATES NATIONAL MUSEUM BULLETIN 251 



several zooids and the holotype, 4 mm. X 1.8 mm. in extent, the thick- 

 ness is less than 1 mm. in both colonies. Test soft, gelatinous, trans- 

 parent, contains many zoochlorellae within, not in the lacunae, also 

 curiously shaped spicules. Zoochlorellae 13-15)a in diameter; spicules 

 very large (fig. ol«), larger ones reach about ISO/x in length. They 

 each consist of 3 to G thick rays radiating on a plane; among them, 

 pentacle-shaped ones are most abundant, whereas hexagram-shaped 

 or trifid ones are very scarce. Hypozooidal lacunae not found in test. 

 Contracted thorax about 320/*, abdomen 400-450m in length. No 

 system formed in arrangement of zooids. Branchial aj)erture 6-lobed, 

 atrial aperture a wide opening without atrial languet. About 6 stig- 

 mata in each of four rows. 



Remarks. — This is the second species of the genus Echinoclinum 

 and differs from the type species of the genus, E. verriUl Van Name, 

 in the appearance of spicules which have the form of tetrahedron 

 with four elongated points in the type species. The existence of 

 zooclilorellae in the test in the present new species is also unique. 



37. Lissoclinum fragile (Van Name) 



Figures 32a, 6 



Diplosomoides fragile Van Name, 1902, p. 370, pi. 53, figs. 57-58 ; pi. 61, fig. 126. 

 Lissoclinum fragile Van Name, 1921, p. 338, figs. 31-32.— Van Name, 1924, p. 26.— 



Van Name, 1930, p. 442, fig. 19.— Van Name, 1945, p. 113, fig. 53.— Tokioka, 



1954a, p. 248, pi. 24, figs. 6-7; pi. 25, figs. 1-2. 



MATERIAL EXAMINED 



Philippine Islands : Small Sibago Island ; W. R. Taylor, sta. 7. One small 

 colony (USNM 11668).— Baliwasan ; W. R. Taylor, sta. 10. One small, muti- 

 lated colony (USNM 11654). — Basilan Island, Tundun Pasil, near lighthouse at 

 Isabela Channel, 1 fath., rocky, coral reef ; W. R. Taylor, January 1941. Three 

 smaU colonies (USNM 11685). 



Palau Islands: Iwayama Bay; GVF sta. 100. One small colony (USNM 

 11465). — Iwayama Bay, east side of Oyster Pass; GVF sta. 220. Eight frag- 

 ments (USNM 11439). 



Description. — Nine small colonies from the Palau Islands and five 

 small pieces from the Philippine Islands were examined. The largest 

 is 27 mm. X 13 mm. in extent and only 0.5 mm. in thickness in most 

 parts, but up to 1 mm. along tlie periphery. Test extremely fragile, 

 though impregnated with spicules. Distribution of spicules differs 

 somewhat among colonies; usually so sparse aromid the zooid and 

 in the zooidal stratum that dark brownish zooids are seen through 

 the test, and areas around respective zooids seen as faintly brownish 

 flecks. Spicules found most densely along periphery of colony and 

 sometimes rather densely in surface layer of zooidal stratum, rarely 

 in bottom stratum; thus periphery of colony nearly always whitish. 

 Generally spicules of candidu77i-type and rather small, but may be 



