ON AMPHTIPORUS SPECTABILIS. 277 
tissue of this tube and remaining there or working its way 
still further till it reaches the tissues of the thoracic aorta, or 
some other place suitable to its growth and development ; 
the various stages of which, when the aorta has been selected, 
have been described on a previous page. 
With reference to the morbid phenomena indicating the 
presence of these parasites in the vascular system of dogs 
during life, I have no definite knowledge. Some of the 
affected animals have been of the most miserable kind, others 
have appeared to be in the enjoyment of perfect health—facts 
which appear to me to favour the inference that when actual 
mischief does take place, the cause may be due to the lesions 
induced by the migrations of the growing and more or less 
mature parasite, rather than by the microscopic brood in the 
blood. It would not surprise me, should it eventually be 
demonstrated, that the haggard, loathsome appearance pre- 
sented by a great number of the pariah dogs of every Indian 
town is, in many instances, primarily due to the injuries 
inflicted on the vascular and other tissues of the animals by 
these parasites. 
On AMPHIPORUS SPECTABILIS, De Quatrefages, and other 
NEMERTEANS. By W. C. M’IntosH, M.D., F.R.S.E., 
F.L.S. With Plates XIV and XV. 
Tue description of Amphiporus spectabilis (Drepanophorus, 
Hubrecht) in the ‘ British Annelids,’ Part I, published by 
the Ray Society, was drawn up from a single fine example 
procured off Guernsey, but, as formerly stated,! its rapid 
dissolution after spawning prevented so minute an examina- 
tion of the proboscis and other parts as might have been 
wished. It then appeared clear that the animal was a true 
representative of the Amphiporide, and further opportunity 
of examination does not alter its relationship to any degree. 
T have, however, to acknowledge that the doubts expressed 
as to the accuracy of the description given by the distin- 
cuished M. de Quatrefages, of the structure of the central 
stylet of the proboscis of this species were without founda- 
tion, for though I have not yet had an opportunity of seeing 
the peculiar curved central stylet or its surroundings, the 
1 Op. cit., Part I, Nemerteans, p. 162, 
