1873. , ex- 



direct attention to it, as the organ in question seems likely to prove 

 of use in acquiring a knowledge of the distinction of species in the 

 genus Gorixa. 



In the males of this genus the four last segments of the hind- 

 body are asymmetrical and irregular. In the majority of species, the 

 asymmetry is on the right side, in a few it is on the left, and the 

 strigil has a corresponding situation. 



The results of my investigations are as follows : — 

 j G. Geoffroyi, strigil elongate-oval (breadth much greater than length), 

 1 with about ten rows of teeth, some of the rows irregular. 



! G. Fanzeri, shape somewhat as in Geoffroyi ; six rows. 

 ; G. htguhris, minute, quadrately circular, with about twelve very narrow 

 j rows. 



I C. Stall, sub-ti'iangular, with three broad rows. 

 G. hieroyjyphica, sTa&ller than in Stali ; ob-ovate, with three broad rows. 

 G. Salilhergi, large (perhaps larger in j^roportion to the size of the 

 animal than in any other species), elongate-oblong (breadth much 

 greater than length), sinuate, with six or nine ii'regular rows. 

 G. venusta, sub-quadrate, with five rows, some rather irregular. 

 G. limitata, triangular, with five rows. 

 j G. niyrolinecda, quadrately oval, with six rows. 

 G. striata, large, elongate (breadth much greater than length), sub-reni- 

 form, sinuate, with about fifteen irregular and greatly overlapping 

 rows. 

 G. FaUeni, minute, narrowly pyriform, with four rows. 

 G. distincta, small, sub-quadrate, with five rows. 

 G. moesta, sub-circular, with about five somewhat irregular rows. 

 C. Fabricii, oval, with about six rather broad rows, three of which are 



rather irregular. 

 G. Scotti, pyriform, with five rows. 



G.fossarum, pyriform, with six rows ; apical row very short. 

 G. Doi/ylasi, small, sub-circular, with about six very irregular eroded 



rows. 

 G. Sharpi, somewhat circular, with eight broad rows. 

 G. intricata, large, somewhat circular, with about sixteen rather narrow 



and very irregular rows. 

 G. alpestris, small, sub-quadrate, with four or five rows, one of which 

 is irregular. 



In the species of i^iQ prceusta group there is no strigil, but the 

 intromittent organ is furnished with many strong recurved spines. 

 These spines are present in the other species, but in this group seem to 

 attain a much greater development. In Gymatia, there is apparently 

 no strigil. 



