164 UNITED STATES NATIONAL MUSEUM BULLETIN 251 



9 in Palau specimen, 9 (left) -10 (right) in Anioy specimen, and 10-12 

 in Thai specimen. Dorsal edge of second row falls in distance of about 

 4 stigmata to median line. Stigmata are arranged (D= dorsal, V= 

 ventral) :D4-7 (1) 3-6 (1) 3-7 (1) 4-6 (1) 4-7 V. Parastigmatic ves- 

 sels absent. Tentacles vary remarkably in number according to lo- 

 cality, probably also to condition of preservation or degree of con- 

 traction; only 9 in Palau specimen, 12 in Thai specimen, but very 

 slender and up to 39 in Amoy specimens. Probably small or minute 

 tentacles become indistinct in a strongly contracted state. Ciliated 

 groove a small elongated opening. 



Anterior margin of intestinal loop usually reaches near fifth trans- 

 verse vessel, although it may appi-oach fourth transverse vessel in 

 Amoy specimen. Second intestinal loop deep and wide, axis passes 

 through esophageal region. Anus situated at level of seventh trans- 

 verse vessel (in the Thai specimen), middle of fifth stigmatal row; 

 margin thickened but plain. Stomach globular, usually half as long as 

 intestinal loop, w^ith a number of longitudinal plications on surface, 19 

 in Palau specimen and 11-13, besides typhlosolis, in Thai specimen. 

 Pyloric caecum long and very distinct, cui'ves strongly towards left in 

 C shape, a vessel connecting caecum to proximal portion of rectum 

 leaves caecum at level of its distal one-third. Cardiac half of stomach 

 exposed behind branchial sac. Distinction between hind stomach 

 and middle intestine not clear (figs. Q5b,d) in the Palau and Thai spec- 

 imens, but somewhat clear m Amoy specimen (fig. 65e). Testicular 

 lobe mostly simple (figs. 65e, /) in shape in present specimens, although 

 may be bifid or trifid in some zooids (fig. Q6g). 



Larval trunk 550-600/t in length, ellipsoidal in shape; tail approxi- 

 mately 900/* in length and 250-300/x, in breadth, measuring on fin; 

 chorda about 700/x in length. Four pairs of elongated ampullae seen 

 rather faintly on trunk. Three attacliment processes present, two 

 dorsal ones prominent, ventral one rudimentary (fig. 65^) . Pigment 

 fleck of sensory organ situated near middle of body. 



Remarks. — There are five species of Polyzoinae in the warm water 

 region of the Western Pacific which resemble one another very closely. 

 They are characterized by possessing only a few inner longitudinal 

 vessels in place of branchial folds; a single hermaphroditic gonad on 

 each side of the body, wliich consists of a pair of testicular lobes and 

 a median ovary; and in forming the encrusting colony. These forms 

 are, however, distinguishable from one another by the following 

 characteristics : 



Inner longitudinal vessels 3 on each side ... 1. Botryllocarpa viridis (Pizon) 



Inner longitudinal vessels 4 on each side ; 

 Pyloric caecum elongated and curved, a vessel connects distal one-third of the 

 caecum with intestine. (Stigmatal rows 9-12, longitudinal plications on 

 stomach 11-19) 2. Symplegma viride Herdman 



