On the Land and Freshwater Shells of Barbados. 247 



wards, a double series of punctures above its inferior keel ; 

 lower surface furnished close to the posterior keel with a series 

 of about twelve piliferous pores ; the anterior sui'face smooth, 

 its upper edge feebly granular ; the upper surface when 

 examined with a lens is seen to be adorned with a very fine 

 reticulated pattern ; dactyli of normal form, in contact 

 throughout. 



Legs short, coxa) smooth, femora very finely granular in 

 front ; two rows of spines on the under surface of the distal 

 tarsal segment or foot, the claws free, covered only at the 

 base by the lateral lobes of the foot, the second tarsal segment 

 furnished with a single distal spur. 



Pectines short, furnished with eleven similar teeth, the 

 basal sclerite of the intermediate laminse slightly lobate. 



Genital operculum with right and left halves completely 

 fused to form a plate which is about twice as wide as long, 

 with rounded sides and a lightly convex posterior border. 



Measurements in millimetres. — Total length 59 ; length of 

 cephalothorax 7*5, greatest width 8 ; length of tail 27, of 

 first segment 3*3, of second 3'8, of third 4, of fourth 4*2, of 

 fifth &5, width of first 3, of end of fifth 2 : palp — length of 

 humerus 5'5, width 3 ; length of brachium 6*5, width 3 ; 

 length of " hand- back " 7, wadth of hand 5*3, height of hand 

 3 ; length of movable dactylus 7*6. 



A single female specimen from Port Darwin (N. Australia). 



The form of the genital operculum in this species is the 

 same as in the type of Urodacus excellens, Pocock *. 



XXX. — A List of the Land and Freshwater Shells of 

 Barbados. By Edgae A. Smith and Col. H. W. Feilden. 



Baebados lies about one hundred miles to the eastward of all 

 the West-Indian islands, and is separated from its nearest 

 neighbours, the group designated the Windward Islands, by 

 an oceanic depression of 1000 to 1500 fathoms ; between 

 Barbados and the island of Tobago to the southward, which 

 latter has presumably been connected with the mainland of 

 South America since the introduction of its existing fauna 

 and flora, we find depths of over 1000 fathoms. To the east- 

 ward of Barbados the floor of the ocean rapidly sinks into the 

 profound depths of the Atlantic. Though Barbados is not 



* Ann. & Mag. Nat. Hist. (6) ii. pp. 170-172, pi. viii. fig. 2. 



