from the Persian Gulf, &c. 143 



A very delicate pellucid Eulimoid, as the specific name 

 chosen denotes. It indeed seems fatuous to be now com- 

 pelled to group the members of this g>nus of ivory whiteness 



and delicacy under a name so ill-chosen, and suggestive of 

 Cimmerian darkness ! 



Mucronalia aethria*, sp. n. (PI. IV. fig. 10.) 



31. testa parva, perhevi, diaphana, nitidissima, oblongo-fusiformi ; 

 anfractibus ad 12, quorum apioales - Bimplioiter beteroatropbi, 

 his ;i proximis attenuato-caudatia, catena ad suturas vix im- 

 pressis, leniter accresceutibus, ultimo longitudine tres approxi 

 matos anfractus ocquante ; peristoraate tenui, columella obliqua, 

 apartura ovato-oblonga. 



Long. 5, lafc. 1*50 mm. 



Hab. Persian Gulf, Ilenjam Island, 40 fathoms, 1906. 



This Mucronalia is a plain, extremely smooth and shining 

 little species, hardly impressed suturallv, the upper whorls 

 much narrowed and slightly caudate, while the nuclei are 

 heterostrophe. Three other species are found in these seas, 

 as follows : — 



3J. bizonula, Melv. Proc. Malac. Soc. vii. 190G, p. I'd, 

 pi. vii. fig. 8. — A minute twice-banded species, found in the 

 Gulf of Oman at 156 fathoms and since recorded by Mr. 0. 

 lledley t from Mast Head Reef, Queensland, 17-20 fathoms. 



31. lepida, Melv. ibid. p. 72, pi. viii. fig. 31. — An ovate, 

 small form from the same locality. Entirely white and semi- 

 pellucent. 



31. o.vt/fenes, Melv. ibid. vi. 1904, p. 16S\ pi. x. fig. 13. — 

 Larger than the last in all its parts. Also from the Gulf of 

 Oman, dredged from deep water. 



Turlonilla exilispira\ t sp. n. (PI. IV. fig. 12.) 



T. testa alba, minuta,perattenuata, semipellucente ; anfractibus 13, 

 quorum 3 apicales, valide heterostrophi, caeteris angustis, ad 

 suturas impressis, arete oblique costulatis, costulis ad basin 

 evanidis, interstitiis Iambus, ultimo vix latiore ; peristomate 

 recto, tenui, apertura squarroaula, columella recta. 



Loug. 4, lat. '75 mm. 



Hah. Karachi. 



Almost as narrow as T. angustissima §, Melv., from the 



* aiQpios, clear, bright; 



t Proc. Linn. Soc. N.S.W, 1907, vol. xxxii. p, 505, 



t Exilit, spira, with slender spire. 



§ Proc. Malac. Soc. vol. vi. 1004, p. 55, pi. v. fig. 13. 



