PACIFIC TUNICATA OF U.S. NATIONAL MUSEUM 151 



Order Stolidobranchia: Family Botryllidae 



73. Botryllus primigenus Oka 



Botryllus primigenus Oka, 1928, p. 303, figs. A-B.— Van Name, 1945, p. 223, fig. 

 134.— Tokioka, 1951a, p. 7, fig. 5.— Tokioka, 1953a, p. 236, pi. 42, figs. 1-4. 



MATERIAL EXAMINED 



China: Vicinity of Amoy; S. F. Light, coll.. May 20, 1924. One colony at- 

 tached to Telesto (USNM 1170G). 



Palau Islands : Iwayama Bay, mouth of Oyster Pass ; GVF sta. 236A. More 

 than 12 small colonies (USNM 114GG) . 



Descriptign. — About a dozen colonies from the Palau Islands and 

 a single extensive encrusting colony from Chinese waters were ex- 

 amined. The former are all very small, crowded on branches of a 

 corallinacean alga, each containing only a few or several zooids. Test 

 transparent, mantle purplish brown. Chinese colony encrusts a horn- 

 shaped alcyonarian colony and measures roughly 40 mm. long by 

 16 mm. wide at the largest massive portion. Test gelatinous, quite 

 transparent, pale brownish; 9 plications on stomach. In all colonies 

 zooids communicate with exterior through individual branchial and 

 atrial apertures ; stigmatal rows always four. 



74. Botryllus tuberatus Ritter & Forsyth 



Figure 59 



Botryllus tuberatus Ritter & Forsyth, 1917, p. 461, pi. 39, figs, 10 & 12 ; pi. 40, 



fig. 22.— Van Name, 1945, p. 225, fig. 135. 

 Botryllus communis Oka 1927b„ p. 607.— Tokioka, 1951a, p. 8, fig. 6.— Tokioka, 



1951b, p. 14, fig. 3.— Tokioka, 1953a, p. 237, fig. 15; pi. 2, figs. 3-4; pi. 42. 



figs. 5-9. 



MATERIAL EXAMINED 



China : Probably Amoy ; T. Y. Chen, University of Amoy, received October 12, 

 1932. One colony (USNM 11533).— Vicinity of Amoy; S. F. Light, coll. Two 

 colonies (USNM 11705). 



Palau Islands : Eastern end of Urukthapel Island, outer reef ; GVF sta. 28. 

 One colony (USNM 11454). 



Gilbert Islands : Onotoa Atoll ; P. E. Cloud, sta. GOC-59. Four colonies 

 (USNM 11475). 



Description. — A single colony from the Palau Islands, three col- 

 onies from Chinese waters, and four small ones less than 3.5 mm. X 3 

 mm, in extent from the Gilbert Islands were examined. The Palau 

 specimen is an encrusting form, 25 mm.Xl5 mm. in extent and 2 mm. 

 in thickness. The Chinese specimens consist of two massive colonies 

 and one complicatedly sliaped colony consisting of 9 club-shaped 

 masses (fig. 59a), the largest about 10 mm. in diameter and 20 mm. in 

 length, the smaller ones nearly spherical. Zooids are found only on the 

 upper surface of distal parts of above-mentioned club-shaped masses. 

 The massive colonies are large, about 20 mm. in diameter and up to 

 42 mm, in length and lobaled rather irregularly. 



