PACIFIC TUNICATA OF U.S. NATIONAL MUSEUM 181 



stomach uninjured; sliohdy luiriowcd towards cardiac, end, about 10 

 longitudinal plications on surface, plications on attachment surface 

 somewhat irregular. Polycarps 15 elliptical, about 1 mm. long, ar- 

 ranged mostly along endostyle ( ? ) , and found on inner surface of 

 broken nuantle. 



91. Cnemidocarpa areoluta (Heller) 

 Figure 76 



Styela areolata Heller, 1878, p. 108, pi. 2, fig. 14.— Herdman, 1906, p. 316, pi. 4, 

 figs. 24-33.— Van Name, 1918, p. 86, figs. 38-40; pi. 31, fig. 27.— Tokioka, 1950, 

 p. 145, fig. 20. 



Cnemidocarpa valhorg Hartmeyer, 1919, p. 35, pi. 1, figs. 14—16. 



Cnemidocarpa irtna Hartmeyer & Michaelsen, 1928, p. 388, figs. 40—42. 



Styela {Cnemidocarpa) iriiiu Kott, 1952, p. 217, fig. 11. 



Cnemidocarpa areolata Tokioka, 1953a, p. 254, pi. 54, figs. 1-9; pi. 68, figs. 5-8.— 

 Tokioka 19.">3b, p. 14, fig. 9.— Tokioka, 1954a, p. 261, pi. 35, figs. 4-7.— 

 Tokioka, 19.34b, p. 85, fig. 3.— Tokioka, 1959a, p. 229, pi. 15, figs. 23-24. 



MATERIAL EXAMINED 



Marianas Island : Saipau Island ; Tanapag Harbor. P. E. Cloud, sta. D-7, 

 One specimen (USNM 11501). 



Description. — A 19 mm. long, rather elongated specimen from Sai- 

 pan Island was examined. Animal attached to substratum by ventral 

 side. Branchial aperture terminal, atrial situated fairly posterior to 

 middle of body. Test very thin, leathery, and yellowish wdiite, inner 

 side whitish. Surface irregularly wrinkled by contraction. Mantle 

 thin, light bro^^•nish. Musculature developed better than in small 

 young individuals of Polycarpa captlosa^ which resemble the present 

 specimen very closely in general shape of mantle body. Eather stout 

 atrial tentacles (fig. 76e) on velum. Endocarps on inner surface on 

 both sides, several enclosed in first intestinal loop. In branchial sac 

 inner longitudinal vessels are arranged (D= dorsal, V= ventral) : 

 Left D (14) 3 (13) 3 (12) 3 (9) 3 V 



Right D (13) 3 (13) 3 (12) 4 (10) 4 V 



Transverse vessels arranged: thick p thin p medium p thin p thick, 

 or, thick p thin p thick (p = parastigmatic vessel). Stigmata 3 to 5 

 in each mesh, may be up to 8 in meshes along endostyle. Tentacles 32 ; 

 large, medium, and small ones differentiated. Ciliated groove simply 

 U-shaped. 



Axis of second intestinal loop passes through middle of oval stomach 

 occupying about proximal one-third of ventral branch of first in- 

 testinal loop and having about 9 longitudinal plications on its free 

 surface. Pyloric caecum not found, although inner pyloric corner of 

 stomach is swollen insignificantly. Anal margin cut into 14 lobules. 

 Two gonads on left and three on right side, all elongated. Testis 

 situated on attachment surface, testicular follicles, up to about 25 in 

 number, arranged roughly in two rows, though partly in a single row. 



