134 collinge: a new species of anadenus from china. 



Anadenus dautzenbepgi, n. sp. Pi. vi., figs, i— 8. 



Animal (PI. vi, figs, i — 3) yellowish-grey, with a yellowish-brown 

 dorsum, which is bounded laterally by a dark line, with short, lateral 

 branches. Head yellowish. Mantle almost circular, reddish-brown, 

 with irregular, brownish-black mottling. Respiratory orifice slightly 

 behind the middle of the mantle. Generative orifice below, and 

 some little distance behind, the right lower tentacle. Rugai small, 

 irregular in outline, in somewhat diamond shaped groups, divided by 

 deep black sulci. Peripodial groove small but distinct. Foot-fiinge 

 same colour as the body, excepting in the tail region, where it is 

 similar to the ground colour of the mantle ; lineoles nearly black. 

 Foot-sole shows ill defined median and lateral planes, of a brownish- 

 yellow colour, median plane faintly marked by transverse wrinkles. 



Length (in alcohol) 37*5 mm.; length of mantle i4"5 mm.; breadth 

 of foot-sole 1 1 "5 mm. 



Shell (PI. vi, figs. 4a, 4b), almost circular, thick, convex above, 

 concave below, apical portion well defined, faint excentric lines of 

 growth. Ventrally there is a thick, lip-like infolding. 



Maj. diam. 5 mm., min. diam. 4-9 mm. 



Hah. — Qua Toun, mountains (3,500 ft.) dueS.E., Fo Kien, China. 

 Tijpe in my collection. 



Anatomy. 



The Jair (PI. vi, fig. 5) is arcuate and consists of twenty-one, 

 partly unequal, separate, vertical lamellae, each bearing closely set 

 transverse striae. In A. altivagus, Theob., and A. sechuenensis, 

 CUge., the vertical lamellae average ten in number, and they are 

 about twice the breadth of those in this species. 



The Radula agrees very closely with that figured by Pilsb.y^ for 

 A. alHrar/21.'!, excepting that here the mesocones are shorter and 

 blunter. 



The Alimentary System (PI. vi, figs. 6, 7). — This is much simpler 

 than in either A. altivagus, Theob., or A. sedmenetisis, CUge. It 

 reminds one somewhat of the condition which is found in the 

 American genus Anadenulus, Ckll.,- which seems to form an inter- 

 mediate stage between Anadenus, Heyn., and Prophysaon, Bid. and 

 Binn. (cf. Pilsbry, oj). cit. pi. xi, figs. 32, 35). 



The buccal cavity is slightly produced backwards, and measures 

 9'5 mm. in length, from the dorsal side there is a short oesophagus 



I Proc. Malac. Soc. Lond., 1898, vol. iii, p. 96, pi. vii, fig. 7. 

 2 Proc. Acad. Nat. Sci. Phila., 1898, p. 254. 



