ENTOZOA. 171 



Habitat. Intestine of cat and dog ; very rarely in man. 



T. marginata, Batsch. Head subrounded. depressed, obtusely tentra- 

 gonal ; proboscis short. Segments short, square ; terminal ones oblong. 

 Genital pore upon alternate sides of the segments. 



Measurements. 1-2^' long ; lf-3'" wide. 



Habitat. Intestine of wolf; rarely in man (Cobbold) in larval form (C. 

 tenuicollis). 



T. lophosoma, Cobbold. Strobila 9 feet long; breadth of each joint, "; 

 length T 'j"; proglottides ^ to ^ of ao inch ; reproductive pupillaj uniserially 

 disposed at the margin on one side throughout the entire colony of segments; 

 individual joints irregularly pentagonal in outline; average diameter of the 

 eggs, 5^5". Original specimen in Museum of Middlesex Hospital, London. 



Bothriocephalus, Bremser. Cestodes furnished with two suctorial mouths 

 or marginal oblong, or long opposite pits. Head subquadrangular, most 

 part articulate. At the centre of under surface of each segment a conical 

 papilla emits the intromittent organ. Behind this body is another smaller 

 pore without a papilla. It is supposed to be the vulva, but is not always 

 present. The penis is furnished with a sheath, and communicates with a 

 tolerably long deferent canal, which is folded several times upon itself, grad- 

 ually increases in thickness, and terminates in a vesicula seminalis, having 

 the form of an oval pouch. The testicle consists of white granules, and is 

 furnished with three slender ducts, which terminate in the above-mentioned 

 vesicle. The female organs are somewhat more complicated ; the ovaries 

 are oblong and very distinct ; the oviduct presents itself under the form of a 

 tortuous canal, especially at the period when the ova are mature. The uterus 

 has two pouches or diverging horns. (Moquin-Tandon.) 



B. latus, Bremser (Broad tapeworm). Head oblong, unarmed, two mar- 

 ginal pits or fissures. Neck inconspicuous. Joints about 2000 ; mature 

 joints broader than long, separating in groups. Genital pore placed in me- 

 dian line ; male opening larger and superior, from which the broad and 

 smooth penis is prominent. Quiescent scolex unknown. 



Length 21-24'. Embryo with 6 hooks, in the ovule 0'008-32 m - long, 

 0-002 broad ; elliptic yellowish brown, included iu a dehiscent operculum. 

 (Kuchenmeister.) 



Habitat. Intestinal canal of man. 



B. cordatus, Leuckart. Head heart-shaped, or rather obcordate, and set 

 on to the body without the intervention of a long neck. Segments increase 

 rapidly, the anterior end becomes lanceolate: 50 joints immature; GGO 

 joints in all. Smaller than B. latus; calcareous corpuscles in increased pro- 

 portion ; ' uterine rosette' smaller, longer, with larger number of lateral 

 processes. 



Habitat. Intestine of dog and man ; more frequently encountered with 

 the former. So far as has been ascertained, peculiar to Greenland. 



