168 



PL A THELMINTHES 



egg capsules attached by a slender pedicle : 2 genera and 4 species, para- 

 sitic or commensal on the gills and outer surface of Limulus polyphemus. 

 1. Bdelloura Leidy. Anterior end tapering; posterior end wide, 

 with a glandular disc for attachment: 3 species. 



B. Candida (Girard) (Fig. 272). Body 15 mm. long, 

 4 mm. wide, gray in color; egg capsule 2.5 to 4 mm. long; 

 testicular sacs 60 to 100 in number: often very common. 

 B. propinqtua Wheeler. Body 8 mm. long; testicular 

 sacs about 170 in number; egg capsule 1.25 ram. long; not 

 so common as the above. 



B. wheeleri Wilhelmi, Body 6 mm. long, 1 mm. wide, 

 the greatest width being in front of the pharynx; sucker 

 not set off from body: on Limulus; not common. 



2. Synccelidium Wheeler. Body elongate, tapering 

 towards both ends, which are blunt; posterior rami of intestine unite, 

 forming a single median trunk: 1 species. 



S. pellucidum Wheeler (Fig. 273). Body 3 ram. long; testicular fol- 

 licles large, about 14 on each side of the body ; egg capsules 

 .75 mm. long. 



Suborder 3. TERRICOLA.* 



Land planarians. Intestinal branches simply lobed; 



position of mouth variable ; uterus small, behind the genital 



pore; body oval or elongate, and usually brightly colored, 



and with a creeping sole on the ventral surface : 5 f arailies 



and about 400 species which occur raostly in 



tropical countries, living in damp places. 



Fig. 272 

 Bdelloura 



Candida 

 (Verrill). 



m 



Fig. 274 



Placo- 



cephalus 



keirensis 



(von Graff). 



Fig. 27.3 



Syncwlidium 



peUucidum 



(Wheeler). 



Family 1. BIPALIIDAE. 



Body often very elongate, usually brightly colored, and 

 with longitudinal or transverse stripes ; head end broadened, 

 forming plate with numerous raarginal eyes; raouth median 

 or post-median ; genital pore back of mouth : 4 genera and 

 about 90 species. 



Placocephalus von Graff. Body often enormously 

 elongate; head plate thin, much broader than long, and 

 with a semicircular margin : 15 species. 



P. kewensis (Mosley) (Fig. 274). Body 10 to 20 cm. 



(in some cases 45 cm.) long, narrow and with parallel sides, 



yellowish in color; with 7 longitudinal stripes; sole white: greenhouses in 



America and Europe; native country unknown, although possibly Samoa. 



* See "Monograpliie d. Turbollarien, II. Tricladida terricola," by L. von Graff, 

 Leipzig, 1899. 



