346 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



SPECIFIC DIAGNOSIS OF CHOANODERA CAULOLATILI 

 The body is elongate, fairly thick, almost equally wide along most of 

 its length, only slightly tapering and rounded or subtruncate at each end. 

 In life, orange yellow in color. Size 2.565 to 3.307 by 0.945 to 1.282 (a 

 specimen 1.40 long contained but one egg). The thick cuticula covered 

 with scales or spines which are close together in the anterior part of the 

 body but gradually becoming fewer until rather sparse near posterior end 

 of body. Edges of the forebody folding in ventrally, separated anteriorly 

 but converging posteriorly to meet just posterior to acetabulum. (This 

 conspicuous and peculiar character gives the forebody the shape of a fun- 

 nel flaring anteriorly but with its ventral side open. Sometimes the folds 

 almost meet ventrally, forming a longitudinal slit along the length of the 

 forebody. Under pressure the folds may be flattened out laterally to form 

 an expansion of the forebody.) Oral sucker subterminal, round, 0.165 to 

 0.225 in diameter; acetabulum subcircular, often slightly wider than 

 long, 0.262 to 0.337 in diameter, its aperture usually wider than long. 

 Forebody 1/4 to I/5 body length. Prephaiynx short, often extending down 

 over anterior part of pharynx; pharynx unmodified, usually somewhat 

 longer than wide but of variable proportions, 0.104 to 0.127 in length by 

 0.078 to 0.141 in width; esophagus very short and surrounded by gland 

 cells ; intestinal bifurcation approximately midway between suckers ; ceca 

 extending to near posterior end of the body where each ends blindly. 

 Genital pore median at anterior edge of acetabulum. Testes tandem, close 

 together, smooth or with slightly crenulated border, extending between 

 the ceca ; anterior testis about at midbody level. Testes somewhat variable, 

 especially the anterior testis, usually wider than long. They are sometimes 

 subequal in size, but either one may be considerably larger than the other. 

 Posttesticular space from slightly to considerably longer than forebody 

 length. Seminal vesicle an ovoid sac just posterior to and partly overlap- 

 ping the acetabulum, narrowing (dorsal to acetabulum) to a tubular pars 

 prostatica surrounded by a well-developed prostate gland. Just anterior to 

 the middle of the acetabulum the tube bends ventrally and is joined by the 

 uterus to form a tubular genital sinus or ductus hermaphroditicus. Cirrus 

 and cirrus sac lacking. 



Ovary a short distance anterior to the anterior testis and to the right 

 of midline, just median to the right cecum, about halfway between ante- 

 rior testis and acetabulum, without distinct lobes and almost always some- 

 what extended in a diagonal direction. Since it is somewhat broader at 



