1873.] F. Stoliczka — Land-shells of Fenang Island. 31 



During life the length and comparative thickness of the animal changes 

 very rapidly, as may be noticed from a comparison of the two sketches taken 

 from life and one from a specimen preserved in spirit. The animal is cover- 

 ed by a thick layer of mucous secretion, it is very active, and readily burrows 

 in light decomposing vegetable substance. The three black longitudinal 

 bands are connected by a similarly coloured net work which continues, inter- 

 spei'sed with, or dissolved into, little dots, to the lower edge of the mantle. 

 The three distinctly marked bands distinguish the present species from the 

 Javaen Pli. reticulatus, according to Ferussac's figures 2* and 3 on pi. 8 E., 

 p. 96^, Moll. terr. et fluv. vol. ii. The peduncles are about 5 m.m. lono*, 

 provided with distinctly developed globules on which the small black eyes 

 are situated ; the tentacles are very short, and when the animal moves about 

 scarcely noticeable ; both are veiy pale coloured. 



The anatom}^ of the species almost perfectly agrees with that given by 

 Keferstein of PA. striatus and hilineatus. The internal pulmonary cavity 

 extends to about one anterior fourth of the length of the body, and in the 

 fresh animal is always well marked by the mantle above it being somewhat 

 inflated. On this inflated portion, the mantle is smooth, on the other parts 

 generally slightly rugose. 



The genital organs (comp. fig. 13) have no special amatorial gland. 

 The seminal receptacle is a globular pedunculated bag^ situated a short dis- 

 tance from the hermaphrodite opening. In two specimens which I examin- 

 ed, I noticed the development of a strongly fibrous bundle of muscles at the 

 entrance of the receptacle, where it branches ofl* from the oviduct, but there 

 was no special amatorial organ present. 



The jaw is semilunar, strongly curved, thin, radiately striated j when laid 

 flat about one mill, broad. 



The radula is 2*8 m.m. longj only about 0*5 broad ; there are about 170 

 rows, and 87 teeth in each row : the central tooth with a symmetrical simple 

 curved cusp, the laterals with a more oblique but simple cusp, both it and 

 the basal plate gradually decrease in height until the last teeth become almost 

 linear and form a confluent row. 



None of the other organs require any special notice. 



I found three specimens of this species among old decaying vegetable 

 matter on the ground at the northern base of Penang hill, about one hundred 

 feet above the sea. 



* E. V. Martens (Preuss. Exp. nach Ost-Asien, Landschnecksn, p, 182) refers to 

 this figure as a synonym of Ilassolt's Parmacella reticulata, which he quotes as Par- 

 marion retlculatas. I do not know Hassolt's original figure, but surely the one given 

 by Ferussac doesa not represent a Parmacella or a Parmarion. 



