from the Persian Gulf, <$sc. 155 



Oxynoe omega, sp. n. (PI. Y. fig. 29.) 



0. testa ovata, cartilaginea, laevigata, epidermide tenui sordide 

 strarainea induta, postice contracta, spira depressa, acute trun- 

 catula, antics dflatata, rotuudata, anfractu ultimo tumescente, 

 labro fere recto, leniter ad basin rotundato, pertenui. 



Alt. 6, lat. 4 mm. 



Hab. Gulf of Oman, Charbar, 5 fathoms. 



Several examples, some of which seem slightly malformed. 

 0. delicatula, Nevill *, appears the nearest ally. This is 

 reported from both Ceylon and Australia, and about the same 

 size as the proposed new species ; the last whorl is, however, 

 much less tumid and full, and the posterior contraction more 

 marked. 



The name Oxynoe, Rafinesque, 1819, has many years' 

 precedence over Icarus, Forbes, 1844, and the better-known 

 Lophocercus, Kroken, 1847. 



Cylindrobulla systremma f, sp. n. (PI. V. fig. 30.) 



C. testa parva, elongato-cylindrica, tenuissima, membranacea, 

 superficie undique bevi, subpellucente, ochraceo-straminea ; an- 

 fractibus 3, apicalibus duobus inclusis deplanatis, ultimo maxime 

 involuto ; apertura angustissime supra, ad basin multum latiore, 

 subtruncatulo. 



Long. 6-25, lat. 3*75 mm. (sp. max.). 



Hub. Gulf of Oman, Mekran Coast, off Charbar, 40 fathoms. 



In form resembling the much smaller European species 

 G. fragilis, Jeffr. C. sculpta, Nevill \, is atso comparable. 

 This species, much of the same dimensions, though a little 

 broader proportionately, is very finely striate, our species 

 being quite smooth. 



Dentalium tomlini, sp. n. (PI. V. fig. 31.) 



D. testa mediocri, multum incurva, longitudinaliter regulariter 

 costata, costis 11-12, interdum versus aperturam anticam evan- 

 escentibus, interdum undique fortibus, regularibus, interstitiis 

 lsevibus, paullum excavatis, superficie nunc albescente, nunc 

 ochro-carnea, apice anali in speciminibus haud adultis perminimo, 

 aliter sub lente bifisso, antico nequaquam expanso. 



Long. 22, diam. antic. 3, post. 1 mm. 



* Journ. Asiatic Soc. Bengal, 1869, p. 67, pi. xiii. figs. 5-5 c. ■ 

 t tjvorpe^a, a roll. 



% Journ. Asiatic Soc. Bengal, 1869. p. 68, pi. xiii. figs. 3-3a. 



11* 



