PACIFIC TUNICATA OF U.S. NATIONAL MUSEUM 65 



20. Dideninuni (Dideninum) nioseleyi (Herdman) 



FiGUEE 20d 



LcptocUnum nioseleyi Herdman, 1886, p. 272, pi. 37, figs. 9-14. 



Didcmnnm mosclcyi Sluiter, 1909, p. 4o.-Van Name, 1918, p. 151, figs. 102-103.— 

 Tokioka, 1949b, p. 43, fig. 3.— Tokioka, 19.j3a, p. 185, pi. 15, figs. 1-8 ; pi. 16, 

 figs. 1-11 ; pi. 17, figs. 1-6.— Tokioka, 1954a. p. 243, pi. 20, figs. 2-7.— Tokioka, 

 1954b, p. 77, fig. 1.— Tokioka, 1955a, p. 212, pi. 14, figs. R-S.— Tokioka, 1955b, 

 p. 44, pi. 1, figs. 6-9.— Tokioka, 1959a, p. 30. 



Didcmnnm {LcptocUnum) mosclcyi Sluiter, 1914, p. 74. 



fLcptocliniim albidinn var. f/rande Herdman, 1886, p. 291, pi. 35. figs. 11-14. 



fDidemnum grandc Van Name, 1918, p. 148, figs. 98-101; pi. 30. figs. 20-23. 



MATERIAL EXAMINED 



.Japan : Tsugarii Strait, off Cape Tsiuka ; Albatross sta. 4808. Six colonies 

 attJiched to seaweeds and bryozoan (USNM 11633).— Hokkaido, off Kanioi Misaki 

 Ught; Albatross sta. 4987. One colony (USNM 11743). 



Philippine Islands : Baliwasan ; W. R. Taylor, sta. 10. Several colonies 

 (USNM 11651).^ — Pangapuyan Island, Bavara at the other side of Sitio, 1 fathom 

 .sandy, muddy and stony, with eelgrasses ; W. R. Taylor, January 1941. A few 

 fragments from the surface of Valonia: (USNM 11676) . 



Australia : Port Jackson ; North Pacific-Exploring Expedition, sta. S.H. 142, 

 collector William Stimpson 1853-56. Several colonies (USNM 11766) growing 

 on Herdman ia momus var. grandis ( Heller) ( USNM 11767 ) . 



Palau Islands : Barrier reef NW. of Koror Island ; GVF sta. 25. Nine colonies 

 (USNM 11379).— Iwayama Bay, between Kaibakku Island (XXIX) and Aulup- 

 tagel Island ; GVF sta. 30. A small mass attached to seaweed (USNM 11458). — 

 Ngemelis Island, seaward reef flat ; GVF sta. 61. Two colonies, with gorgonians 

 (USNM 11.392).— Iwayama Bay, south end of Island XX; GVF sta. 134. One 

 colony, attached to Tiirbinaria (coral) (USNM 11.399). — Iwayama Bay, east side 

 of Oyster Pass; GVF sta. 220. Three small, zooidless colonies (USNM 11443) 

 from surface of Polycarpa iirayamac Tokioka (USNM 11412) . — Ngerkuid, west of 

 Eil Malk; GVF sta. 261. Six colonies attached to Halimeda (alga) (USNM 

 11397), together with Dideninum ternatanum (Gottschaldt) (USNM 11398). 



GiLBEET Islands : Onotoa Atoll ; P. E. Cloud, sta. GOC-35. One colony with 

 sexually immature zooids (USNM 11488) attached to Polycarpa iuayamae 

 Tokioka (USNM 11494). 



Description. — The specimen from the Gilbert Islands is small, 4 

 mm. X 3 mm. in extent and 1 mm. in thickness ; those from Port Jack- 

 son, Australia, are less than 10 mm. X 7 mm. in extent and only 

 0.5 mm. in thickness; a thin colony from Japanese waters is 3 mm. in 

 diameter and 15 mm. in length, encrusting a small piece of reef coral ; 

 from Philippine waters a considerable number of small colonies less 

 than 25 mm. X 13 mm. in extent ; about 20 colonies from the Palaus, the 

 largest 35 mm. X 23 mm. in extent, and varies in thickness from 1 to 2 

 mm,, exceptionally up to 5 mm. along the periphery and in some parts 

 of larger colonies. The colonies are encrusted, irregular in shape, and 

 usually white, but may be faintly grayish, yellowish or purplish either 

 all over or in parts of some of the colonies. The colony from GVF sta. 

 13-1 in the Palau Islands (USNM 11399) is rather heavily pigmented; 

 dark brownish pigment is deposited in the surface layer of the zooidal 



