SKELETO-TEOPniC TISSUES AND COXAL GLANDS. 153 



limbs as in Limulus, instead of being a simple oval body as in 

 Scorpion. 



Fig. 3.— Right coxal gland of Limulus polyp hem us, Latr., after Packard 

 (' Anniversary Memoirs of the Boston Society of Natural History,' 1880), 

 «2, «3, «4, ab. Posterior portion of the chitinous base of the coxae of the 

 second, third, fourth and fifth prosomatic limbs, b. Vertical stolon of 

 the gland, c. Its four transverse lobes, coinciding respectively with the 

 second, third, fourth and fifth coxae. 



I have not had an opportunity of dissecting the coxal glands 

 fully in Mygale at present, but I have found them to be 

 present in Mygale cementaria (the trap-door spider), kindly 

 sent to me from Naples by Mr. Neville Reid. In the common 

 English Epeira diadem a I have failed to find evidence of the 

 presence of the coxal glands in complete series of microscopic 

 sections cut transversely to the long axis of the prosoma, and 

 I am inclined to conclude that they are absent in the smaller 

 spiders. 



The discovery of these glands in other Arachnida such as 

 Thelyphonus, Galeodes, and Opilio offers an interesting field 

 for future investigation. 



