i66 Records of the Indian Museum. [Vol. XIX, 



as complete an account of A. footei as can be adduced from 

 Theobald's description and figures. He also includes in the refer- 

 ences (without any comment, however,) the monograph by Haas 

 cited above. 



It is, therefore, of interest to be able to record the discovery 

 of two complete young shells and the left valve of a full-grown 

 specimen in the collections of the Zoological Survey of India. These 

 can be assigned definitely to this species and may, owing to 

 uncertainty^ as to the existence of the original types, be taken as 

 the neotypes of A . footei. 



The specimens were collected by Dr. F. H, Gravely in April, 

 1912, at Taloshi in the Koyna valley, Satara District, Bombay 

 Presidency, at an altitude of about 2,000 feet. 



The locality "Gutparba falls" may be considered here. No 

 falls of this name are known on the Kistna River, but a tributary 

 of the Kistna is known as the Ghatprabha and it is evident that 

 the name Gutparba is only an olcl way of spelling Ghatprabha. 

 The course of this stream is described in the Gazetteer * of the 

 Bijapur District as follows : — ' ' The Ghatprabha rises near the edge 

 of the Sahyadris almost twenty-five miles west of the town of 

 Belgaum. After an easterly course of about 140 miles through 

 Belgaum and the Southern Maratha states, it enters Bagalkot three 

 miles north of Kaladgi. Through Bagalkot it runs nearly east for 

 about twenty miles, and then immediately below the town of 

 Bagalkot turns suddenly north. Between Bagalkot and Yerkal, 

 about five miles north of Bagalkot, it forces its way through two 

 chains of hills, a pretty country with picturesque views of hills 

 and water. Beyond the second range it enters the Krishna valley 

 and falls into the Krishna about fifteen miles to the north-east 

 opposite Chimalgi." The Koyna valley lies to the north-west of 

 the Ghatprabha valley, and the Koyna, another tributary of the 

 Kistna, flows through it. Dr. Gravely's specimens therefore 

 extend the range of the species, but not beyond the river-system 

 from which it was originally described. 



Theobald's description of the shell of A. footei is incomplete, 

 and the following description, based on the Koyna valley specimens, 

 is therefore given : — 



Shell moderately large and thick ; elongate, subrhomboidal, 

 very inequilateral. The dorsal and ventral outlines are nearly 

 straight and parallel in the young, but owing to an antero-downward 

 slope of the dorsal side become greatly inclined in the adult 

 thereby greatly reducing the length of the anterior margin. An- 

 terior margin strongly truncated above, rounded below; posterior 

 margin truncated above and also truncated below in the young, 

 but evenly rounded in the adult. A small but distinct posterior 

 wing, better marked in the young than in the full-grown 

 specimens. Umbonal region prominent, slightly swollen and 



' Gazetteer of the Bombnv Presidevcy—BiTapiiy, by I. M. C"amnbcll rBom- 



