184 Jaio and Lingual Dentition of Pulmonata. 



The surface of the animal is dirty white, with about seventeen vertical 

 rows, on each side, of dark blue or slate blotches, interrupted by the 

 longitudinal reticulations running parallel to the foot, but again com- 

 mencing and extending to the edge of the foot. These blotches diverge 

 in all directions from under the shell and mantle, running almost perpen- 

 dicularly on the side of the animal, but very obliquely in front and behind. 

 The tail is quite keeled with oblique blotches. These blotches also run 

 obliquely from a median line on the fore part of the extended animal. 

 Tentacles, eyepeduncles and front of head slate color. Lips developed 

 and kept constantly in motion as tentacles. The reticulations of the sur- 

 face are large and few. 



In specimens preserved in alcohol there appears a locomotive disk. 

 There is no caudal pore. The respiratory and anal orifices are far behind 

 the centre of the mantle edge on the right of the animal. The genital 

 orifice appears somewhat behind the right eyepeduncle. The mantle is 

 scarcely reflected upon the shell, even in front. When the animal is fully 

 extended, Dr. Cooper says the mantle equals one-fourth of its length. 

 The mantle exudes mucus freely. It seems fixed to the shell, not chang- 

 ing its position with the movements of the animal. 



One of the shells collected by Mr. Hemphill is twice as large as that 

 whose measurements are given by Mr. Bland and myself. 



The jaw is thick, slightly arcuate, ends blunt : anterior surface with 

 six well developed ribs denticulating either margin, situated on the central 

 third of the jaw, and as many subobsolete ribs on each outer third : no 

 median projection. PI. xvii, fig. 2. 



Lingual membrane (pi. xvii, fig. 3) long and narrow. Teeth 31-1-31, 

 with about fifteen laterals, but the change into margiuals is very gradual, 

 the latter being a simple modification of the former. My figures give a 

 central with the first, sixteenth and thirty-first teeth. 



The genitalia I did not succeed in extracting, they being but imperfectly 

 developed in the individuals received. The nervous ganglia and the di- 

 gestive system present no peculiar features. 



The generic description will be as follows : — 



Animal heliciforme, antice obtusum, postice rapide acuminatum. Palli- 

 um subcentrale, extra testam antrorsum prolongatum. Discus gressorius 

 distinctus. Porus mucosus caudalis nullus. Apertura respiratoria et 

 analis ad dextram sita, in parte posteriore marginis pallii. Apertura 

 genitalis post tentaculam dextram oculigeram. 



Testa externa, paucispira, haliotoidea, animal non includens. Pars 

 cxclusa in hibernis epiphragmate albido, duro, membraneo protecta. 



Maxilla arcuata, costis validis exarata. Dentes linguales quadratae, 

 centrales tricuspidatre, laterales et margiuales bicuspidatae. 



