PAIEING or TEGENAEIA GUYOJSfll. 173 



organs of the Chernetes (Pseudo-Scorpiones). They are also found, 

 with some modification of arrangement, on T. atrica, T. civilis, 

 Epeira diadema, Amauroibius fenestralis, and A. similis. 



I desire particularly to call to these glands the attention of 

 those interested in the anatomy and study of spiders generally. 

 It yet remains to he observed whether they occur in both sexes 

 in other genera, and whether they only are developed in the adult 

 males of other species. 



DESCRIPTION OF THE PLATES. 



Plate VII. 



Fig. 1. Digital joint of right palpus of Tegenaria Guyonii, S (hairs removed). 

 S, sheath ; Sp, spermophorum ; A, spoon-shaped cayity ; G-, groove ; 

 E, embolos ; R s, ribbed surface ; T, tentaculum, which is probably used 

 for holding the female. X 15. 



2. Spermophorum, embolos, and tentaculum. (Letters as above.) X 40. 



3. Opening of embolos. X 255. 



4. Opening of embolos : Spe, spermatozoa. X 150. 



5. Junction of testis with vas deferens. 



6.. Diagrammatic longitudinal section of male abdominal sexual organ. 

 E d, ejaculatory duct ; P, papilla-like process ; S S, tubular spines. 



7. View from below of male abdominal sexual organ (somewhat diagram- 



matic). X 80. 



8. A, bifid spine and basin ; B, two spines with common basin in section ; 



C, common basin of four spines (cut short) ; D, single spine (cut 

 short) and basin. X 220. 



9. Vertical transverse section of male abdominal sexual organ through 



spines and ejaculatory duct. S S, tubular spines ; 0, the convoluted 

 ducts ; G-, G, G, glands ; E d, ejaculatory duct ; Spe, spermatozoa. X 80. 



10. Section as above, showing base of spines, convoluted ducts, and G, G* 



two glands. X 250. 



11. Gland and duct leading to one of four spines with common base. The 



gland was torn on removal of connective tissue. X 250. 



12. Vertical longitudinal section of male abdominal sexual organ. A, A, 



connective tissue traversing glandular region ; B, B, connective tissue 

 surrounding the glandular region ; G, G*, G*, glands ; P, papilla-like 

 process ; B d, ejaculatory duct ; A M, one of the diverging groups of 

 muscles which run from the external skin to the inferior side of the 

 ejaculatory duct; D, part of a muscle in connexion with the ejacula- 

 tory duct. X 75. 



Plate VIII. 



13. Vertical transverse section. V S, ventral surface ; A M, group of diverging 



muscles which run from external skin to the inferior side of the 

 LINN. JOTJEN. — ZOOLOGY, YOL. XYII. 13 



