396 ME. E. T. GtJNTHEE ON THE 



escape through a transverse slit just below the apex of the 

 ovisac. The ovaries extend into the posterior thoracic and 

 anterior abdominal segments. The eggs vary from about '25 to 

 •3 mm. in diameter. 



In the male the vasa deferentia open at the slightly expanded 

 extremities of a Y-shaped organ, which probably contains paired 

 sperm-sacs and ductus ejaculatoria. The distance between the 

 externnl sexual apertures exactly corresponds to that between 

 the two processes on the claspers, which will be described below, 

 and which I am inclined to consider as being employed for the 

 purpose of transferring the spermatozoa to the female. Near 

 the base of each of the two processes, and on its inner aspect, is 

 a small spinular process with a sharp tooth. 



The abdomen terminates in a slight dilatation, withia which 

 numerous rectal muscles arranged radially and obliquely traverse 

 the space between the body -wall and the rectum. The anus is 

 terminal and is flanked by two small lateral furcal lobes, upon 

 which are implanted two simple non-plumose setae in the males, 

 but none in the females. In respect of the scant development of 

 these setae, A. urmiana approximates to the condition of A. mul- 

 Jiausenii, as Schmankewitsch described it, from brine of sp. gr. 

 1-2015, rather than the foim from brine of 1-1373 sp. gr., which 

 was provided with one or two, though seldom three, setse. At 

 the same time it must be remembered that A. urmiana has lived 

 for a longer time in its water of sp. gr. 1-1138 than Schmanke- 

 witsch's type from water of sp. gr. 1-1373, and has therefore had 

 a longer time to develop those anatomical characters which seem 

 to be the direct result of life in brine. 



Appendages. — The antennae are sometimes twice the length of 

 the eyes and eyestalks. The joints seem to vary in number and 

 relative proportion ; as many as five may be distinguished in some 

 individuals. The terminal joint bears three sensory hairs. 



The claspers are enormously developed in the adult males, and 

 may measure as much as 4 mm. across. The proximal joints are 

 much thickened, and carry upon their inner faces two rounded 

 processes which are used for clutching the females, and which are 

 probably of service in transferring the spermatozoa (spermato- 

 phores?) to the females from the two lateral expansions of the 

 male genital organs. The second joint is large, flattened aud 

 triangular in shape ; it terminates in a pointed process which is 

 otten incurved. 



