570 BRITISH ORIBATID^. 



that it would be very difficult to distinguish what he 

 believes to be the nymph of this species from that of 

 8. sculptus, except possibly by the shorter pseudo- 

 stigmatic organs. This opinion seems to be confirmed 

 by the appearance of the larvae which, as mentioned 

 below, I dissected out of the body of the female after 

 death, and after it had been kept for some time in pre- 

 servative liquid ; it frequently occurs, however, that 

 markings on the cephalothorax or abdomen of larvae 

 or nymphs which might have distinguished them in 

 life are lost in preserved specimens. 



Distribution. — This species was discovered by Mr. 

 E. Bostock in water crawling on fresh- water algae 

 (Prasiola stipltata and Gladophora fracta) ; where the 

 fresh water was dripping over the rocks close to the 

 sea, but not where the sea would come, at Puffin 

 Island, North Wales ; it was tolerably abundant there 

 when he found it in the summer of 1886, but it has 

 not to my knowledge been found anywhere else as yet. 

 The name is given to it by its discoverer. 



Viviparity. — In the first vol. of this work (page 72) 

 I have stated my belief that one species of the present 

 genus, viz. 8. maculatus, was frequently, or at some 

 seasons of the year, if not always, viviparous or ovo- 

 viviparous. This view receives considerable confirm- 

 ation from the present species, and ;S^. hilineatus, as 

 Mr. Bostock has actually witnessed the birth of living 

 larvae from living females of these species ; and in the 

 case of 8. corrugatus I have myself dissected out of 

 the body of a dead female, which had been preserved 

 in dilute acetic acid, no less than seven larvse, all fully 

 formed and apparently of about the same age and size, 

 but I was not able to detect that they were enveloped 

 in any eggshell or membrane. 



