2 Transactions of the Society. 



necessary shortly to refer to, in order to explain the organs connected 

 with them. 



The TJropodinse are a suhfamily of the Gamasidse, but are in 

 many important respects exceptional : the position of the first pair of 

 legs, the coxae whereof are inserted within the oral tube, the position 

 of the male genital organ, and the slender mandibles form well- 

 marked distinctions. The general appearance also is different from 

 that of most of the Gamasidse, so much so indeed that Hermann * 

 included the species discovered by him (U. cassideus) in his genus 

 Noiaspis ; a genus intended to be entirely composed of what we now 

 call Orihatidse (Latreille's earlier name of Oribata having excluded 

 Hermann's Notaspis). 



During the summer of 1888, when staying at a farmhouse in 

 Derbyshire, I found Uropoda Krameri (Canestrini)t in great abundance 

 on the floors and walls of an old barn used for storing hay. This 



Fig. 5. — Claw and caruncle, highly magnified. 



„ 6. — Larva. 



„ 7. — General view to show the arrangement of the principal internal organs of 

 the adult female, x 65. The whole of the dorsal chitinous plate has 

 been removed, except the striated band round the periphery, and a small 

 portion within this, which is shown by its broken outline. The masses 

 of fatty matter and almost all the muscles liave also been removed. For 

 the sake of clearness, the respiratory system is shown on the left side 

 only, and the tendons and commencement of the muscles whereby the 

 Malpighian vessels were attached to the dorsum and side, are shown on 

 the right side only. 



„ 8. — Alimentary canal and Malpighian vessels seen from above, x 70. The 

 drawing is made from a large and apparently well-nourished specimen 

 immediately after dissection. The Malpighian vessel is shown on the 

 right side only, its commencement being indic-ated on the left. 



„ 9. — The alimentary canal seen from below, x 70. This drawing was made from 

 a smaller and possibly less well-nourished specimen, after the dissection 

 had been partially prepai-ed for permanent preservation. 



„ 10. — Internal sexual organs of adult male seen from above, x 70. 



„ 11. — The same from below ; same amplification. 



„ 12. — Penis in its ordinary position resting in its armature, X 175. 



„ 13. — Penis withdrawn from its armature, x 175. 



„ 14. — Internal genital organs of adult female seen from below, x 70. 



„ 15. — Vestibule looking straight upwards into the mouth from below, x 160. 



„ 16. — Genital plate seen from within, x 75. 



„ 17. — Point of the same, showing the thin lanceolate termination, x 300. 



„ 18. — Genital plate and vestibule, x 70. General view to show the relative size, 

 and the mode in which they would fit agahist each other. The vestibule 

 is turned to the right and backward ; the oviduct being thereby twisted. 



„ 19. — Eespiratory system of the left side, highly magnified, seen from within the 

 body, ac^, acetabulum for reception of 2nd coxa, ac^, ditto for 3rd 

 coxa, dp, depression for reception of 2nd leg. d^, depression for recep- 

 tion of 3rd leg. st, stigma, pt, peritreme. tr, main tracheal stem. 

 6^, ht, bf, bundles of fine tracheae. 



„ 20. — Brain (so called), and oesophageal ganglionic collar. The hole near the 

 centre is where the oesophagus passed through ; it has been removed. 



* ' Memoire apterologique,' Strasbourg, 1804. 



t I believe the species to be U. Krameri; I have not, of course, Professor 

 Canestrini's type specimen to compare the anatomy, but the creature appears to agree 

 with his description and with Professor Berlese's drawing, which is stated to be 

 taken from that specimen. ' Acari Miriapodi e Scorpioni Italiani,' fasc. xi. 



