212 Transactions of the 



from my own observations. This gland consists of two jDarts ; 

 anteriorly there are a pair of oval swellings of the inner sm'face of 

 the integument, one being situated on each side of the ganghon 

 and otoKthic vesicle ; these swellings gradually subside to the level 

 of the integument towards the middle line in front, but more 

 suddenly behind ; they project nearly half-way across the body, and 

 are composed of circular molecules imbedded in a matrix which 

 appears to be composed of sarcode. When deterioration first 

 begins to set in, a few rows of large hexagonal cells make their 

 appearance on each side of the central nervous system, which, as 

 the animal progresses towards dissolution, become more and more 

 of a rounded form until they represent rows of hemispherical 

 projections ; it is in this state that Dr. Fol has given a figure of 

 these glands. That this appearance is abnormal, and the result of 

 commencing decomposition, is demonstrated by the fact, that it is 

 not seen in perfectly fresh specimens, that it comes on gradually, 

 passing first through the hexagonal stage, and that subsequently 

 other parts of the integument show hemispherical projections 

 resembling these, but of varying sizes, according to the position 

 they occupy as mentioned above ; during the farther progress of 

 dissolution they develop into globules of a highly refracting ap- 

 pearance, which obscure all view of the interior of the body ; in 

 extreme cases a hke process goes on in the walls of the viscera 

 simultaneously. 



The posterior portion of these glands presents quite a different 

 appearance from the anterior ; this part consists of three transverse 

 rows of square corpuscles terminated anteriorly by a sharp edge ; 

 each of these corpuscles is divided from its neighbour by a clear 

 line; this band is finished off posteriorly by a border of finely 

 granular material, which is obscurely filled in some cases by cor- 

 puscles of an oval form, with the long axis placed transversely ; it 

 was this band of square corpuscles that I rashly concluded, in my 

 last paper, were rows of stigmata, but that they are not openings, 

 and have nothing to do with such structures, is easily shown by 

 feeding these animals with indigo. 



There is no excretory duct to these glands, but the gelatinous 

 material of the " Haus " appears to be exuded through the finely 

 granular portion which is situated between the two in the mid line 

 on the neural side of the body. 



Ihe endostyle, and the glandular body on each side of it, may 

 be considered as appendages of the integument. The endostyle, 

 which was briefly described in my last paper, appears on the dorsal 

 view to be a solid body very nearly divided longitudinally into two 

 halves by a fissure, which is slightly expanded at its anterior end ; 

 its posterior extremity projects for a short distance beyond or 

 posterior to the anus. A minute examination of its substance 



