DESCRIPTION OF T^ENIA MARGIN ATA. 563 



circlet of hooks, as has been lately asserted. 1 This is proved not 

 only by the form and size of the hooks, but also by the fact that 

 all the (8-10) specimens yet seen have exactly the same organization. 

 To doubt the value of this character is to question the specific nature 

 of almost every one of the Tcenicc. 



The worms occurred in a white woman (not a negress) about 

 fifty years of age, and were from twelve to fifteen in number, being 

 all found in the connective tissue of the muscles and subcuticula, 

 with the exception of one, which hung freely on the inner surface of 

 the dura mater, near the crista galli. 



The related Tcenia is unknown, but, from analogy, one is naturally 

 inclined to think that it lives in the human intestine like Tcenia 

 solium. If this be true, we should look for the bladder- worm also in 

 some other animal, such as the ox. 



P Taenia marginata, Batsch. 



Kiichenmeister, " Ueber die Taenia e Cysticerco tenuicolli, ihren Finnenzustand und 

 die Wanderung ihrer Brut," Moleschott's Unlersuch., Bd. i., pp. 256-378 : Frankfort, 



1856. 



The adult Tcenia, which is found in the dog and wolf, is distin- 

 guished from the other tape-worms parasitic in these animals, first by 

 its length, which attains to 2'5 mtr., but is usually little above 1*5 mtr. 

 The proglottides are also large, and thus it may be easily mistaken for 

 T. solium, though the habitat and the form of the hooks are different. 

 The quadrangular head has a diameter of about 1 mm. The suckers 

 are, on the whole, smaller and weaker than those of T. solium ; the 

 hooks are about the same size, but more slender, and provided with longer 

 roots. Their number is on an average from thirty six to thirty-eight, 

 the maximum being forty-two, the minimum thirty-two. The neck is 

 usually so slightly narrowed, that the head passes gradually into the 

 body without perceptible constriction. The segments begin a few milli- 

 metres behind the head, but only gradually increase in length, so that the 

 square form is attained somewhat late, at about the time of maturity, 

 and at a distance of about 50 cm. behind, the head in about the 550th 

 joint. The posterior border of the proglottis is prominent, overlapping 

 the anterior edge of the succeeding one, and is not unfrequently undu- 



1 Thus Redon, Comptes rendas, t. Ixxxv., p. 676, 1877. In support of this 

 assertion he cites a case of Cysticercus cellulosce in which he counted forty-seven hooks 

 in three rows (?). The numbers given are somewhat unsatisfactory. Kiichenmeister seems 

 to share Redon's opinion (" Parasiten," second edition, p. 136), and would deduce it from 

 a Tcenia solium with six suckers. It is, however, difficult to see how the brood should 

 come to inherit, instead of six suckers, some forty hooks arranged in three rows. 



