346 Prof. H. Claparéde on the Structure of the Annelida. 
tubular pores exist, we likewise find the large scattered glandular 
pores. This description applies not only to the external cuticle, 
but also to that of the pharynx when it attains a great thickness. 
The subcuticular layer (the dermis of M. de Quatrefages) 
appears almost always to contain glandular follicles in all the 
regions, even in the cirri and antenne. These follicles discharge 
themselves outwards through the glandular pores that I have 
just described. Some of them only secrete a thick liquid ; others 
produce bundles of bacilli in their interior (I shall indicate these 
under the name of bacillparous follicles) ; others, again, secréte 
granules. 
The bibliography relating to the bacillar corpuscles of ‘the 
Annelida is already rich. To M. Max Miiller belongs the prio- 
rity of the discovery of these organs, which he described and 
figured from the skin of two larval forms and from that of Che- 
topterus. They have since been observed by Dr. Strethill Wright 
in Spio, by M. F. Miller in Cherusca, by M. Danielssen in Sea- 
libregma, &c. I have myself devoted particular attention to 
them. I have indicated them in the Phyllodocea, in a Tomo- 
pteris (in concert with my friend Dr. Carpenter), in a Sphero- 
syllis, in Spherodorum, and in the Palmyrida; and I have shown 
that, under certain circumstances, the contents of these follicles 
are suddenly discharged outwards. M. Kolliker has completely 
confirmed these observations. In the Phyllodocea M. Ehlers 
has likewise found the bacilliparous follicles, and ascribed to 
them the secretion of the mucosity. It is curious that observa- 
tions so numerous as these should have entirely escaped the 
author of the ‘ Histoire Naturelle des Annelés.’ 
Certain families have their integuments literally crammed with 
bacilliparous follicles, even in the cirri and antennee. ‘This is 
the case especially in all the Spiodea and Ariciea and a great 
part of the Chetopterea. Their abundance is also remarkable in 
a great number of Phyllodocea and in some Hesionea. In the 
latter, especially, their grouping and their relation to the excre- 
tory pores are very remarkable. The function of these organs, 
indeed, is still quite problematical. I formerly compared them 
with the cells filled with acicule of the Turbellaria, and with 
the urticating organs of the Apneustic Mollusca, the Acalephee, 
and Anthozoa; but this is pure hypothesis. 
The tubular glands filled with spherical granules were first 
indicated by me in several Annelida. They sometimes attain a 
very large size, particularly in the Lycoridea; and in this case 
the glomerule formed by the interlacing of the glandular tubes 
was known even to the older writers, and regarded by them asa . 
sac. M. de Quatrefages* was acquainted with one of the pas- 
* Hist. Nat. des Annelés, tome i. p. 75. 
