41 



loped condition, however (fig. 2), the thoracic region becomes 

 greatly enlarged, so that when viewed from the dorsum, the 

 animal has a rounded-ovate form, with a narrower region in 

 front, and it is only in a lateral or ventral view that the snout 

 and caudal portions are fully seen (fig. S). In many speci- 

 mens there is a series of somewhat regularly arranged dimples 

 on the dorsum. 



The head is supplied with two antennae composed of four 

 segments, the sides and terminal articulation of which have 

 numerous chitinous spines. The next pair of appendages is 

 similar to the corresponding pair in the male, being more 

 slender than the antennae, and tipped with strong spines, one 

 of which is longer than the others. There next follows a 

 series of foot-jaws, but they are not easily differentiated. 

 Two pairs of thoracic feet at least are visible behind these. 



Posteriorly the abdominal region is bifid, and furnished 

 with two long styles similar in structure to those first de- 

 scribed. In the adult, the ovisacs are attached by a slender 

 pedicle to a slight prominence on each side near the poste- 

 rior end of the abdomen, and form cylindrical pouches filled 

 with a vast number of whitish ova. 



The microscopic spines occur on the anterior part of the 

 cephalothorax, the snout, and other parts of the animal. 



Note on the Distribution of Nerves to the Vessels of the 

 Connective Tissue in the Hilus of the Pig's Kidney, 

 and on the Ganglia found in Connection with these 

 Nerves. By James Tyson, M.D., Lecturer on Micro- 

 scopy at the University of Pennsylvania. (With three 

 woodcuts.) Read before the Biological and Microscopi- 

 cal Section of the Academy of Natural Sciences of Phila- 

 delphia. 



Premising that these observations are incomplete, though, 

 I believe, accurate as far as they go, my excuse for bringing 

 them under the notice of the Section at this stage is, that its 

 members may have the opportunity of examining the prepa- 

 rations before they become altered. Having been mounted 

 quite two months, they are still in good keeping, though it 

 is impossible to state how long they will remain thus. The 

 observations, when complete, will also have for their object 

 to determine whether these nerves and ganglia are also dis- 

 tributed to the vessels and tubules in the secreting structure 



