224 UNITED STATES NATIONAL MUSEUM BULLETIN 251 



40 mm. long specimen 

 Left D (13) (14) (IG) (18) (16) (15) (10) V 

 Right D (16) (17) (18) (18) (15) (15) (12) V 



One transverse row of infundibula in each interval between transverse 

 vessels, in all up to 15 infundibular rows. Tip of each infundibulum 

 usually divided into two apexes, which are then situated along distal 

 margin of branchial plication, although not bifid at some places. 

 Tentacles up to 20, larger and smaller differentiated, also minute 

 ones in intervals; branches in 3 orders. Ciliated groove C-shaped, 

 opens posteriorly. 



Anterior margin of intestinal loop attains posterior base of branchial 

 aperture. Anal margin plain. Gastric region with a dozen irregular 

 longitudinal plications, from which minute hepatic lobides protrude 

 (fig. 101^). Single elongated gonad on each side, right one along 

 dorsal side of kidney sac, left one along dorsal margin of distal branch 

 of intestinal loop. Ovary occupies axial portion of gonad, fringed by 

 testis along margin. 



Remarks. — This species closely resembles Molgula (Molgula) inter- 

 rupta Tokioka, but the former can be distinctly distinguished from 

 the latter in the appearance of the musciUature. In M. (M.) interrupta 

 all the longitudinal muscles are cut in pieces, just as the transverse 

 muscles are, and the arrangement of the transverse muscle pieces is 

 not as complicated as in M. (M.) xenophora; the neural region sur- 

 rounding the dorsal ganglion is quite free from any muscle in M. (M.) 

 interrupta. The ciliated groove of Oka's original specimens is de- 

 scribed as horseshoe-shaped and opened to the right side, slightly 

 inclined anteriorly. This feature differs somewhat from that of the 

 present specimens. The discrepancy must be discussed fully in the 

 future on more specimens from various localities. 



116. Hartmeyeria orientalis Oka 



Figure 102 



Hartmeyeria orientalis Oka, 1929, p. 351, figs. A-C. — -Tokioka, 1953a, p. 295, 



fig. 25; pL 78, figs. 6-11. 

 Hartmeyeria longistigmata Tokioka, 1949a, p. 11, pi. 5, figs. 4-7. 



MATERIAL EXAMINED 



Japan: Kyftshti Island; Kagoshima. E. S. Morse, coll. Specimens 21 (USNM 

 11698,.— Kydshti Island; Moji. E. S. Morse, coll. Specimens 3 (USNM 11707). 



Description. — The 24 specimens presented from the Tokyo Im- 

 perial University, in exchange, were examined. Animals less than 

 12 mm. in length, surface wholly encrusted with fine sand grains. 

 Six plications on each side of branchial sac, of which the second is 

 represented by a single longitudinal vessel. Inner longitudinal vessels 

 are arranged (D = dorsal, V=ventral): 



10 mm. long specimen 

 Left DO (9) (1) (8) (6) (6) (3) V 



Right D (10) (1) (8) (7) (6) (3) V 



