INTEENAL ANATOMY OF THE GAMASIX.E. 313 



course, and contirmes in tliat direction until near its origin, Avhcii it turns outward 

 and ujnvard and ends in a sharp point. At the place where the hook arises there 

 are two discoidal or ovoid projections from the upper edge of the movahle arm, tlie 

 proximal smaller than, and somewhat overlying, the distal ; these are less highly 

 cliitinized than the rest of the chela. The portion of the movahle chela which 

 works within the penultimate joint of the mandihle forming the articulation is very 

 large, and has a considerable-sized foramen in its upper part ; from its lower i)art 

 there projects a long narrow sac of cuticle, not much cliitinized, and which stands 

 free from the rest of the mandible and nearly reaches the indentation before the 

 hook. The mandible of the female (fig. 4) has the distal end of the fixed arm of 

 the chela much more gradually curved and thinner than that of the male ; the two 

 teeth behind it are much stronger, and there arc two curious transparent blades 

 which descend from its outer edge and appear like guides to the movable arm. 

 Two very much smaller blades of similar material are found on the lower edge of 

 the last-named ai-m, which otherwise has not anything remarkable about it ; it is 

 entirely without the great hook of the male. 



Ej^istome (fig. 5) hyaline, campanulate (with the broad straight end attached lo the 

 body), lateral edges curved downward ; the wholi' free edge is l)ordered by a dense 

 fringe of long fine hairs directed forward. 



Legs near together, long ; without apophyses in cither sex ; all legs terminated by 

 long caruncles and claws, and furnished with numerous strong spines and hairs. 



Dorsal surface densely clothed with short spine-like hairs, set in transverse wavy 

 rows; the hairs longer than the distance between the rows, and alternate, so that 

 the end of each hair overlaps the row behind and lies between two hairs of that 

 row. These hairs all point backward except those at the edge, which stand slightly 

 outward and form a fringe round the body. The hairs increase a little in length 

 from the anterior to the posterior part of the body ; the longest are those on the 

 soft cuticle. Leuirth of the hairs from about -03 millim. at the anterior to about 

 •07 millim. at the posterior end of the body ; distance apart laterally about '02 millim. 

 There are two long straight hairs projecting over the rostrum. 



Ventral surface haired. Anal plate small, inversely pyriform ; there are three long 

 hairs behind it. Genital plate of female sac-shaped, widest posteriorly, attached by 

 its whole surface, not hinged; its anterior edge bordered by a fine membrane. 

 Genital aperture of female a curved transverse slit. There are two small curved meta- 

 podic plates, one on each side of, but some distance from, the genital plate. Stigmal 

 plates narrow and curved. Sternal plate with distinct scale-like markings. 



Habitat. Eound commonly, but not abundantly, in the nests of the Common Mole 

 {Talpa eiiropcea) in England. The young may probably be parasitic on the Mole, as 

 I do not often find them in the nest. 



SECOND SERIES — ZOOLOGY. VOL. V. 



46 



