494 • Rccofds uj the Indian Museum. |Voi.. XXII, 



1897. Fotamides i TelescopinmJ telescopitim, v. Martens. Suss, mid 



Brackiv.-Moll. in Weber's Zool. Ergebn. Niederl. Oif'.-Inriien 

 I\ . pp. 180-182. 



1898. Cetithiiim {Telescopiuni) telescopitim, Kohelt, Ceritltimn in Mar- 



tini and Cliemnitz Conch.-Cab. (ed. Kiister), pp. 57, 58. pi. 

 xii, fig-. 1. 

 1916. Potainides [Telescopiti in) ftisciim, .Annandale and Kemp, Mem. 

 Ind^ Mils. V, pp. 344, 345. 



Von Martens has given a fairly complete synonymy and the 

 exact distribution of the .species, and a few of the important refer- 

 ences only are given above. 



A fairly complete account of the anatomy of this species was 

 published by Berkley ' in 1835, while Quoy and Gaimard had given 

 good figures of the animal in the previous year. '' The radula has 

 the formula 3.1.3. 



The specimens in the collection are from mangrove swamps 

 at Belawan (Deli) ; and at Perbaoengan (Serdang). They were col- 

 lected at different times and are of various sizes ranging from 30 

 mm to no mm. in length. 



Subgenus Tympanotonos (Morch) Adams. 



Potainides cingulatus (Gmelin). 



1788. Miii-ex cingulatus, Gmelin, Linn. Syst- Nat. ed- XllI, p. 3561 

 1838. Ceyithiitm flnviatile, Potiez and Michaud, Gal. de Moll, I. p. 



363, pi. xxxi, figs. 19. 20, 

 1866. Tympanotonos fliiviatilis, Reeve, Conch. Iconica, XV", pi. ii, sp. 



9, fi.ijs. a, b. 

 1897. Potamides i Tympanotonos) cingulatus, v. Martens, op. cit., pp. 



183,184.' 

 1916. Potamides ( Tympanotonos) fliiviatilis. .\nnandale and Kemp, 



op. cit., p. 344. 



Kobelt in his monograph of the genus CcritJikim (loc. cit.) 

 does not mention this species, but the references given above and 

 those given in the above references should be quite enough to 

 identify the species. It may also be noted that the species is not 

 the same as Murex flm'iatilis, Gmelin, which is a s5'nonym of P. 

 radula (Linn.). 



There are a few specimens in the collection from the man- 

 grove-swamps at Belawan (Deli) and Perbaoengan (Serdang), two 

 specimens from the mouth of the Soengei Batang Kwis (Serdang), 

 and two from a rice-field at Perbaoengan (Serdang). The species 

 is essentially a brackish-water form and the two specimens from 

 a rice-field at Serdang were probablj^ carried there during floods.^ 

 Only two of the specimens are perfect, in all others the greater 

 ])art of the outer lip is broken. The radula of the species is 

 described and figured by Troschel.'' 



' Zoological Journal, \ , pp. 431-439, pis. xx, xxxi (1835). 



■^ 'Astrolabe' Zoology, 111, p. 125, pi. Iv, figs. 4— 6 (1834). 



i* I think this is not possible. Perhaps there is a label-error. I remember 

 that once I collected in these rice-fields and also near the sea on the same day 

 and that 1 did not possess good boxes for keeping separate tlie collecied material, 

 [den Doop]. 



* Das Gebiss der Schnecken, I, pp. 143-146, pi. xii, fig. 2. 



