66 Contributions to Indian Malacology. [No. 1, 



Family AMPHIBOLID^]. 



No. 27, Amphibola Bm-mana, n. sp. PL II, fig. 7 — 10. 



Testa aperte umbilicata, naticoidea, tenuiuscula, castanea, periom- 

 phalo plerumque saturation, nitidula, suhsinuate striatula, infra sutu- 

 ram dense peroblique striata, lined una elevatd spirali, interdum obso- 

 leta, superne hand procul a sitturd signata. Spira conoidea, apice vix 

 obtusa, sutura profunda. Anfr. 4 rotundati, ultimus tumidus. Aper- 

 tura ovata, superne rede angidata ; peristoma vix interruption, breviter 

 adnatum, tenue, marginibus approximatis, callo tenui junctis, dextrali 

 superne sinuatd, basali recta, columellari breviter reflexo, umbilicum 

 partim tegente. Operculum corneum, paucispirale, nucleo basali, 

 sinistro. 



Alt. 10, diam. 9 J- mill., apertura 7 J- longa, 5 J lata. 

 Shell openly umbilicated, naticoicl, rather thin, orange-brown, dark- 

 er around the umbilicus, smooth, marked with subsinuate lines of 

 growth, closely and very obliquely striated just below the suture, with 

 a single raised spiral line, which is sometimes obsolete, on the upper 

 portion of each whorl. Spire conoidal, apex subacute, suture deep. 

 Whorls 4, rounded, the last swollen. Aperture ovate, rectangulate 

 above ; peristome scarcely interrupted, free, except for a very short 

 distance, from the last whorl, thin, margins closely approximate, united 

 by thin callus, right margin rather deeply sinuate above, basal straight, 

 columellar turned back near the umbilicus, which it partly conceals. 

 Operculum horny, paucispiral, nucleus basal, sinistral. 



This is, I believe, the first instance in which the presence of Am- 

 pliibola has been indicated in the Indian or Burmese seas or estuaries ; 

 nevertheless, it is very common. I found, in Mr. Cuming's collection, 

 specimens of the same form as that above described, which were 

 collected in Malacca by Dr. Traill, and a smaller form, scarcely separable 

 as a race from the above, abounds in Bombay harbour. 



The present species is nearly allied to A.fragilis, Quoy and Gaimard, 

 but is thinner, with a lower spire. It was found abundantly crawling 

 on mud, between tidemarks, in company with Assiminea rubella and 

 Plecotrema Cumingiana. The animal was difficult to make out. as it 

 consisted of an indistinct translucent mass. There were no tentacles, 

 and the eyes were on very short lobate pedicels. The animal differs 

 considerably from the figure of that of Amp. fragilis, as copied from 

 Quoy and Gaimard by both Adams and Mrs. Gray. 





