86 



DESCRIPTIONS OF SIXTY-EIGHT NEW SHELLS FROM THE 



PERSIAN GULF, GULF OF OMAN, AND NORTH ARABIAN 



SEA, DREDGED BY MR. F. W. TOWNSEND, OF THE 



INDO-EUROPEAN TELEGRAPH SERVICE, 



1901—1903. 



By James Cosmo Melvill, m.a., f.l.s., f.z.s., and Robert Standen, 



Assistant Keepek, Manchester Museum. 



Part I. Plates A, B. 



{Reproduced from the Annals and Magazine of Natural History Ser. 7, Vol. Xll.) 



Two years ago we published a Catalogue * of the Mollusca of the Persian 

 Gulf, &c. (Cephalopoda, Gastropoda, and Scaphopoda only), mainly collected 

 by Mr. Townsend in 1893—1900, and enumerating 935 species. In the interim 

 further large consignments have been frequently forwarded by the same ener- 

 getic collector from many different stations and depths, including especially the 

 results of one particularly profitable dredging on 7th April, 1903, in the Gulf 

 of Oman, lat. 24° 58' N., long. 56° 54' E., at 156 fathoms, which, it is no exag- 

 geration to say, positively teems with novelties. All this has naturally delayed 

 publication of the second portion — to contain the Pelecypoda — of the above- 

 mentioned Catalogue. 



At the present opportunity we offer descriptions of many Gastropoda, 

 mostly of small size, though a few— e. g., Murex, Marjoricz, Trichotropis pul- 

 cherrima, and the highly sculptured and unique Pleurotoma navarchus — are 

 more conspicuous. The Scotef ar e enumerated elsewhere. 



Amongst the " minutiora" we would call especial attention to the two new- 

 species referred to Homolaxis, the H. comu-Ammonis, especially, being entirely 

 evolute from the apical whorl and exactly like a microscopic " ram's-horn." 

 Cyclostrema euchilopteron, prominulwn, and Emarginala undulata are very 

 wonderful in their sculpture. A Fluxina, the first recorded from the Old 

 World, and the curious Rissoina reyistomoides are both noteworthy. So is a 

 new species of Metula (M. daphnelloides) and many Pleurotomida3, this family 

 ever having the pre-eminence in abyssal waters. The Kleinella sympiesta, also 

 near akin to K. cancellaris and sulcata of Adams, belongs to a genus which has 

 not before been known to exist in the Arabian Sea or Persian Gulf. 



To Mr. Edgar Smith, I.S.O., and Mr. E. R. Sykes we must express our best 

 thanks for assistance, likewise to Mr. G. B. Sowerby, and Mr. W. Neville Sturt. 

 of the India Office. 



EMARGINULA UNDULATA, sp. n. (PI. A. fig. 1.) 



E. testa parva, delicata, albida, oblonga, apice multum recurvo, margiuem 

 posticum fere superirnpendente ; radiis costalibus ad 40, majoribus cum 

 minoribus saepius alternantibus, posticis crassis, firmis, cseteris delicatis, un- 

 dulato-crenatis, undique transversim elegantissime et arete concentrice liratis, 



* Proc. Zool. Soc. l'JOl, vol. ii. pp. 327—460. 

 t Joura. of Conch, s., pp. 340 sqq. 



