1901.] MOLLUSKS FBOM THE PEESIAKT GULF. 375 



BiTTir/M ateamentabium ', n. sp. (Plate XXII. fig. 16.) 

 B. testa doliolifurmi, solidida, castaneo-brunnea vel nigrescente ; 

 anfractibus undecim, quorum apicales tres, vitrei, parvi, delicatis- 

 sime decussati, ccetens apud suturas impressis, sulventricosis, 

 tribus ordinibus gemmularum arete spiralitcr praditis, gemmulis 

 nitidis, interstitiis alveatis, qnadrahdis, xdtimo anfractu quadri- 

 gemmulato ; apertura quadrato~ovata, labro exteriore tcnui, canali 

 brevi ; columella recta. 

 Long. 4, lat. 150 mm. 

 Hab. Karachi. 



A cylindrical, dark chestnut-coloured merging into blacker, 

 and very small species ; the three apical whorls white, pellucid, and 

 small, suddenly developing below into seven or eight subventricose 

 compact whorls, alveolate, regularly gemmulate, with three rows 

 of transverse shining nodules, the last whorl possessing four; 

 mouth somewhat square, outer lip thin, canal short, and columella 

 straight. Several examples, we think mostly adult. 



BlTTIOI TENTHEEXOIS Melv. 



P.G. Bushire. 



Agreeing with the Bombay form in sculpture, but with no trace 

 of the white extremities. 

 I. Bombay (Abercrombie). 



X.B. — Cerithium mamillatum Eisso has been reported from 

 Bombay. This is synonymic of the well-known European Bittium 

 retiexdatum Da Costa, and its record is no doubt erroneous. 



Potaxiides (Ttmpaxotoxus) fluyiatilis Pot. & Mich. 



P.G. M.C. I. 



According to Mr. Townsend a distinctly marine species, occurring 

 on muddy sands, both amongst rocks and on mud-flats, at half to 

 lowest tide. A variety also occurs at Karachi. 



POTAMIDES (TeLESCOPIFM) TELESCOPIDM L. 



Telescophim fuscum Schum. 



I. Karachi. On mud-flats only just covered at high tide, 

 occasionally wandering even beyond tide-mark range. To show 

 how tenacious of life is this mollusk, some specimens were placed 

 in a tin-box containing sand, and at the end of three months, 

 when taken out, were still alive, and seemed none the worse for 

 their incarceration, the sand being perfectly dry the whole time 

 {t.W. T.). 



POT AMID i -.s (Ti ui.isualia) solcatus Born. 



I. Karachi. On mud-flats, but no live specimens seen. 



1 Atru//t>/i/«nus, inkv, from llio colour. 



