52 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



crassicostatis, costis rugosis, iiudique spiraliter rucliliratis, penultimo 

 et ultimo Isevioribus, costis irregularibus, intermissis vel, interdum, 

 omnino absentibus, superficie spiraliter undique tenuilirata, liris 

 arctis, apertura late ovata, labro tenui, expanse, canali brevi, columella 

 paullum excavata. 



(«) typica : colore omnino albido vel pallida stramineo, unicolore. 



(b) mdaleuca : colore pallescente, undique spiraliter uni vel bizonata, 



zonis livido-nigrescentibus. 



(c) plumhea: colore livido-plumbeo, regione labiali, cum columellari, 



solum exceptis, albescentibus. 



Long. 30, lat. 10 mm. (sp. typ. maj.). 



Hah. — Persian Gulf (W. D. Gumming in Mus. Brit.), Maskat, 

 7-15 fathoms; Galig Island, 8 fathoms (var. h, melaleuca) ; Ormara 

 beach («, typica). Also in several other places along the Mekran 

 coast, usually in shallow water, say 3-10 fathoms. 



This interesting Bullia has, until now, been confounded with the 

 similar but coarser-grained B. Cumingiana, Dkr , and I am very much 

 indebted to Mr. E. A. Smith for having called my attention to its 

 specific distinctions. I take as the typical form, because the most 

 generally distributed, the white or pale stramineous form, never 

 clouded or banded with any darker colour. The intermediate 

 (var. melaleuca) is of a very pale bluish-white ground colour, the 

 whorls once or twice banded spirally, these bands being of a dark 

 livid hue. Examples of this variety are mostly smaller than the 

 type. The third variety (plumhea) is almost entirely of a dark leaden 

 grey, relieved only by the whiteness of the labial and columellar 

 regions, standing out in sharp contrast. 



I somewhat doubt the occurrence of the true £. Cumingiana in 

 the Persian Gulf area. 



COLUMBELLA (AsTYRTS) AGATHA, n.Sp. PI. V, Fig. 11. 



C. testa ovata, semipellucida, lactea, nitida, perlaevi, anfractibus 6-7, 

 apicali parvo, omnibus Isevissimis, simplicibus, parum ventricosulis, 

 ultimo effuso, apertura ' ovata, labro tenui, expanse, canali brevi, 

 columella obliqua. Long. 7, lat 2*5 mm. (sp. max.). 



^«J.— Persian Gulf, Gulf of Oman, lat. 24° 58' K, long. 56° 54' E., 

 156 fathoms. Also lat. 23° 55' N., long. 57° 48' E., 22 fathoms. 



A thin, semi-pellucid, unicolorous shell, giving every evidence 

 of being an inhabitant of the deep sea. All the many specimens 

 found were dead shells, but in good and clear condition. I am in 

 this, as in several other instances, indebted to Dr. W. H. Dall for 

 his opinion as to the subgenus of this interesting new form. It may 

 be compared with C. {Astyru) diaphana, Verrill, and C. profundi, 

 Dall,^ from the United States, both species having been dredged 

 fi'om 65 to 805 fathoms at various stations between Rhode Island 

 and Havana. 



1 Bull. Mus. Comp. Zool., vol. xviii, No. 29, pp. 191, 192, pi. xxxv, figs. 3, 9. 



