334 BULLETIN OF THE 



dorsum a slight and rounded ridge runs from shield to tail ; surface longitudinally sul- 

 cate, of a dark orange color ; keel and lateral ridges light lemon ; the sulci and their 

 anastomosing brandies dusky ; head semi-pellucid, neck slender and compressed ; 

 shield anterior, elongate, very convex from side to side, thin and rounded in front, 

 bluntly rostrate beliind ; a large swelling rather behind the middle indicates the situ- 

 ation of the shell, the apex of which is sometimes visible through a small longitu- 

 dinal slit situated on a slight eminence nearly at the end of the posterior portion of 

 the shield ; surface is a rich orange, thickly studded with small oval granules of a 

 rich lemon color : respiratory orifice large, ^ from anterior end of shield ; eye-pedun- 

 cles long and slender, semi-transparent, of a dusky orange ; head and tentacles very 

 beautifully granulate, granules small, regular, and of a pearly appearance ; the mar- 

 gin of the body to the extent of 2 mill, is separated by a sliglit furrow uncovered by 

 integument, grayish, smooth, and secreting mucus very abundantly ; at the tail this 

 margin is 6 mill, in extent and bears a small oval mucus pore ; length of pore, when 

 fully extended, 3 mill. 



" On bushes at Jlozambique, East Africa. 



" Tlie slit in the shield is capable of considerable enlargement. Sometimes a good 

 deal of the shell is visible ; usually the orifice is so contracted that none of it can 

 be seen. 



"A comparison of this molIu.sk with the animal of the African Nanina shows some 

 striking points of resemblance ; in both there is a furrow running from head to upper 

 part of mucus pore, below which the surface is smooth and mucus-secreting ; the 

 pore is similar, and the caudal spine of Nanina is indicated in Urocydus by the 

 peaked termination of the integument behind. Lastly, if we suppose the orifice in 

 the shield of Urocijclus to be greatly enlarged, and the rudimentary shell developed, 

 we shall have an arrangement of the shield similar to the collar of Nanina, namely, 

 part investing the peristome of shell, and part covering dorsum of body." 



The dried carcass, as I received it, is about 32 miU. long. The respiratory 

 orifice seems rather anterior than posterior. The mantle is quite large, with a 

 posterior orifice. The internal plate is simple, 7 mill, long, thin, slightly con- 

 vex, with posterior nucleus and concentric lines of growth. There is a distinct 

 locomotive disk ; longitudinal furrows above the margin of the foot, and a lon- 

 gitudinal caudal mucus pore. The jaw is very low, slightly arcuate, ends 

 scarcely attenuated, blunt, anterior surface without ribs, no median projection 

 to the cutting edge (PI. II. Fig. C). The lingual membrane (PI. II. Fig. D) 

 shows a tricuspid central tooth and bicuspid laterals, as in Zonitcs, the margi- 

 nals are aculeate, the cutting edge bifid. 



This slug can hardly belong to Tennentia, which has a different shelly plate, 

 a median projection to the cutting edge of its jaw, no opening to the mantle. 

 Parmarion is described as very near this slug, but its respiratory orifice is pos- 

 terior, the caudal pore is more developed, not so linear, in a difl'erent position, 

 and apparently with, a horn-shaped process ; its internal plate has a lateral nu- 

 cleus, while in our slug it is posterior, and its jaw has a median projection. 

 DendroUmax has a much smaller shelly plate, a horn-shaped caudal process, 

 and median projection to the cutting edge of its jaw. It seems, therefore, best 

 to consider it an Urocydus, as suggested by Mr. Gibbons. 



