162 ILLINOIS BIOLOGICAL MONOGRAPHS [162 



PROTEOCEPHALUS SULCATUS (Klaptocz) 



[Figs. 130, 131, 175, 176] 



1906: Ichthyotaenia sulcata Klaptocz 1906:123-130 



1911 : Proteocephalus sulcatus La Rue 1911 :475 



Specific Diagnosis: The characters of the genus. Cestodes of 

 small size, up to 68 mm. long. Maximum breadth 1.5-2.0 mm. Scolex 

 very variable in form, unarmed, without apical depression or fifth 

 sucker, divided by distinct furrows into four quadrants. Median fur- 

 rows arise near first proglottids. Cross-section of one type of scolex 

 nearly round, of the other elliptical. Breadth of scolex 0.46-1.75 mm., 

 thickness of same 0.67-1.28 mm. depending on contraction states. Suck- 

 ers, deep rounded, one in each quadrant. Diameter of sucker 0.250 mm. 

 Neck none. First proglottids broader than long. Mature and ripe pro- 

 glottids quadrate or longer than broad. Last proglottid rounded pos- 

 teriorly. Maximum breadth of proglottid 1.5 mm., maximum length of 

 same 2.0 mm. 



Genital pore at end of first third of segment. Cirrus-pouch about 

 0.20-0.25 mm. long, extending about y± across the proglottid. Several 

 coils of ductus ejaculatorius in cirrus-pouch. Cirrus when protruded 

 long and slender. Testes about 200, irregularly arranged between vitel- 

 laria. Opening of vagina posterior to the cirrus-pouch. Lumen of 

 vagina large. Ovary posterior, bilobed. Vitellaria follicular, lateral. 

 Uterus with 10-12 lateral out-pocketings in ripe proglottids. Eggs 

 pear-shaped, circular in cross-section. Diameter of same 0.016 mm, 

 length up to 0.019 mm. 



Habitat: Polypterus endlicheri Heckel (type host), taken at Duem 

 (type locality) on the White Nile, and Clarotes laticeps Ruppell, from 

 the White Nile in the region of Khartoum. 



The material was collected by Dr. F. Werner in the spring of 1905, 

 was described by Klaptocz (1906), and was listed by La Rue (1911) 

 among other species of Proteocephalus. In the summary and also in the 

 following description the data are taken from Klaptocz 's paper and 

 from his drawings. 



A specimen from Clarotes measured 68 mm., one from Polypterus 

 60 mm. The scolex (Figs. 130, 131) is of very variable form, is un- 

 armed, has no apical depression, and it always shows four very distinct 

 furrows of which the two on the median line are the heavier. These 

 divide the anterior face of the scolex into four large similar quadrants 

 whose acute angles come together at the tip of the scolex. The free 



