1895.] HYDEACHNID FOUND IN CORNWALL. 191 



complicated than, those described by Schaub and partially described 

 by Croneberg. In the first place, instead of their blind distal end 

 being attached near the mouth it is attached to the side of the 

 body about halfway back and opposite the genital organs : the 

 gland is not in any way bent into a loop ; its direction is forward 

 for its whole length, but it is greatly and irregularly corrugated 

 and twisted for about two-thirds of its course ; in this part it has 

 an average diameter of about '02 mm., is a fleshy organ composed 

 of largish secreting-cells, and has a very small lumen. The gland 

 suddenly narrows at the end of this portion, loses its twisted and 

 corrugated form, and becomes straight ; it is still somewhat fleshy 

 in appearance, and has a diameter somewhat less than half the 

 diameter of the corrugated part ; its largest diameter is in the 

 centre, and it narrows at both ends to about half the diameter of 

 the centre. This tract of the gland may be considered as the duct ; 

 it is usually filled with small round granules (secreted matter), very 

 similar to that spoken of by iSchaub in the distal portion of his 

 tubular gland and by Croneberg in the same portion in Trombidium ; 

 except that, in consequence of the larger diameter of the organ 

 now being described, the granules do not follow each other in 

 single file as they do in Schaub's drawing. After this portion the 

 duct suddenly expands again and becomes a large transparent 

 ovate bladder, wdth thin, apparently structureless walls (fig. 16, sb.). 

 The diameter of this bladder in its widest part is larger than that 

 of any other portion of the whole duct ; at its anterior end it 

 narrows sharply, and there is a very short tubular part which 

 turns suddenly downward and backward to join the main general 

 duct. This description is not taken from a single specimen, all 

 the numerous specimens which I have dissected have been alike. 

 The only record at all resembUng this bladder is Pagenstecher's 

 respecting Trombidium. 



It now remains to describe the precise manner in which the 

 various glands above described communicate with the common 

 duct (main general duct). There is one of these common ducts 

 (D.) on each side of the body, and all the three salivary glands on 

 that side communicate with it ; it is of an almost uniform diameter 

 until near its posterior end, where it enlarges somewhat suddenly 

 both in a lateral and in a dorso-ventral direction; the small 

 anterior end or prolongation of the bladder of the tubular gland 

 enters the common duct in the middle line of the upperside of 

 this enlargement, and the two ducts from the reniform gland enter 

 the lateral edges of its upper part, one on each side. The two 

 ducts from the quadrate salivary gland enter the tubular part of 

 the common duct close together some distance nearer to the mouth 

 than the entrance of the ducts from the reniform glands. At the 

 posterior end of the lower part of the enlargement of the common 

 duct, another tube (du.), which at its starting point is of nearly as 

 large diameter as the tubular portion of the common duct but 

 rapidly diminishes and becomes very fine, runs at first backward 

 and then almost perpendicularly downward. I have not been able 



