100 UNITED STATES NATIONAL MUSEUM BULLETIN 251 



by a compact tissue. Surface of stomach sometimes lightly pigmented. 

 Testicular follicles two, usually pigmented rather heavily in purplish 

 brown. Two follicles difficult to discern distinctly in a fully matured 

 state, as both swollen follicles are attached to each other tightly, form- 

 ing a single, nearly spherical compact mass, the cleft between the two 

 follicles being completely covered by dilated proximal part of vas 

 deferens. Cleft discernible as a whitish line across the purplish brown 

 sphere when vas deferens is picked off the testis. Matured egg very 

 large. 



42. Leptoclinum mitsukurii (Oka) 



Diplosoma mitsukurii Oka, 1892, p. 265, fig. 1. 



Leptoclinum okai Tokioka, 1949a, p. 5, pi. 2, figs. 8-9. 



Leptoclinum mitsukurii Tokioka, 1953a, p. 201, fig. 5 ; pi. 24, figs. 1-5. 



MATERIAL EXAMINED 



Japan : Honshu, off Ornai Zaki Light N.17°E., 14.5 mi. ; Albatross sta. 3730. 

 One colony (USNM 11631) attached to Polyclinum constellatum Savigny (USNM 

 11630). 



Thailand : Langsuen ; from a bamboo stake ; H. M. Smith, September 22, 1923. 

 One colony (USNM 11757). 



Description. — One small piece from Japanese waters and an exten- 

 sive colony from Thailand were examined. The former is only 5 

 mm. X 3 mm. in extent and consists of about 20 zooids, while the latter 

 encrusts dead bryozoans, living barnacles and oysters together in 1 mm. 

 thickness and consequently quite irregular in outline, the widest flat 

 part of the colony is seen on the oyster shell and there it reaches to 

 30 mm. X 20 mm. in extent. Test soft, gelatinous, extremely delicate 

 and transparent. Lacunae very spacious, thoraces and abdomens al- 

 most all exposed in lacuna. Stigmata 7 to 8 (usually 8) in each of 

 four rows. Mantle of abdomen enveloping alimentary organs quite 

 devoid of pigment in all examined zooids. Two testicular follicles. 



Remarks. — The colony of Leptoclirium Tuacdotialdi (Herdman) 

 has considerably less spacious lacunae than L. mitsukurii (Oka) and 

 more stigmata are found in each row, the specimens of L. macdonaldi 

 from the Philippine waters have 12-14 stigmata in each row on each 

 side. Leptoclinum caUciforme Sluiter from the tropical Pacific shows 

 a peculiar style of attachment; it attaches to the substratum by a small, 

 usually central part of the underside of the colony. The present 

 species, however, encrusts various objects with the whole underside of 

 the colony. 



42a. Leptoclinum species 



MATERIAL EXAMINED 



Philippine Isi^nds : Pangapuyan Island, Kavara at the other side of Sitio 

 Pangapuyan, 1 fathom, sandy, muddy, stony, with eelgrasses, W. R. Taylor, 

 collector, January 1941. One colony (USNM 11797). 



Description. — A small 4 mm. long piece of colony probably belong- 

 ing to Leptoclinum was found in the sample from Bavara in Panga- 



