684 Dr. T. A. Cliapman on At^i/mvic/rj/ in 



that above (tlie main part of the valve in JTcmaris) so 

 diminished that the emargination is now terminal and not 

 ventral. 



The tegnmen is also affected, its right swollen base is 

 much larger than the left (as seen from above), largely 

 owing to its being horizontal in position and that on the 

 left more vertical, but there is an actual difference ; beyond 

 this is a laterally flattened shaft, which twists, so as to 

 throw the upper edge of the end right over to the left 

 side, and so the descending hook-like process below this 

 bends over very much to the right. There is no subanal 

 process. 



In Hnnaris the tegumen seems to be unaffected. , 



JTcmaris hoonhyliformis (srahios.v, tityus). — The differ- 

 ences between the two sides here are marked, and affect 

 several portions of the appendages. The ,rdo:agus, 

 which is here extremely long and extremely slender, 

 perhaps G m.m. in length, if separated, has the hook 

 or flange developed into a straight spine nearly "7 m.m. 

 in length, and looking like a continuation of tlie shaft 

 of the Kdceagus. It does, however, bend a little upwards 

 and to the left, so that the opening faces a little to the 

 right and downwards. 



There is a membranous (double) sheath to the /vda'acfuii, 

 which has much the same size and aspect as the sheath 

 in some others {Proserpina, Idrictis, Sataspes, etc.) ; it seems 

 larger and fuller on the right side, but in soft parts 

 softened, one cannot depend much on this being tlic 

 natural aspect. 



The double upper piece (tegumen) seems to bo quite 

 symmetrical, but the side pieces (valve and harpe) arc 

 quite different on the two siiles, at least the lower spinous 

 portion (harpe) is so, very markedly. When the valves 

 are separated, the most ventral portion of each, where they 

 meet in the middle line, presents an inflated, ovoid piece, 

 a piece of about 1 m.m. in length. On the left side this 

 piece carries at its summit a series of dark, short, spine- 

 like bristles, on the right side it is produced into a cylin- 

 drical process a fidl m.m. long, and ending in a rounded 

 slightly bulbous end, clothed with similar bristles to those 

 sessilely placed on the other side. It is not very clear 

 whether there is any sort of articulation between this 

 (harpe ?) and the long spatula-like valve proper. The left 

 valve may be described as being deeply notched opposite 



