DESCRIPTIONS OF SIXTY-EIGHT NEW SHELLS. 231 



A most delicate and minute species, of the same character as Utriculus com- 

 planatus, Watson, from Papua (" Challenger " Hep. xv., p. G50, pi. xlviii, fig. 9) ? 

 but that species is longitudinally striate. We follow Pilsbry (Man. Conch, xv, 

 p. 203) in the nomenclature, and would refer to his reasons for the substitution 

 of Eetusa, Brown, 1827, for the more familiar Utriculus, Brown (in parte), 

 1844, non Schumacher, 1817. 



ATYS FLAVOVIRENS, sp. n. (PI. D. fig. 20.) 

 A. testa ovata, in medio tumida, utrinque producta, tenuissima, subdiaphana, 



pallide flavo-virente, apud medium laevi, nitida, antice, simul ac postice, 



spiraliter paucistriata, apice plicato, labro tenui, paulluin eft'uso ; apertura 



anguste lunari ; columella uniplicata, 

 Alt. 7, diam. 3 mm. (sp. maj.). 



Hah. Gulf of Oman, Maskat, 15 fathoms. 



Allied to A. tortuosa, A. Ad., from the Philippines and Torres Straits ; the 

 shell is smaller, and more green than yellow-tinged. Mouth narrower, the 

 anterior as well as the posterior striae being fewer and less pronounced. Many 



examples. 



MATHILDA CARYSTIA* , sp. n. 



31. testa gracili, fusiformi, eleganter attenuata, brunnea, brunneonigra, vel, im- 

 primis, castanea ; anfractibus 12—13, quorum apicalis heterostrophus, pervi- 

 treus globularis, cceteris apud suturas impressis, binis pracipuis Iambus 

 carinis prgeditis, sexvel septem ultimis ter minoribus asperis, omnibus acutis, 

 prominulis, interstitiis quadratulis, ultimo anfractu 9-carinato, quorum tres 

 circa peripheriam maxime conspicui ; apertura fere rotunda, labro tenui, 

 crenulato ; columella alba, crassiuscula, recta, nitida. 

 Long. 12, lat. 3 mm. 

 Hob. Persian Gulf , Koweit, 10 fathoms, mud and sand. 



A very select species, having the vitreous heterostrophe apex so character- 

 istic of the genus ; turritelloid in shape, elegantly attenuate, the upper whorls 

 with two principle carinas and three lesser keels, the lowest whorl nine-keeled, 

 of which three, at the periphery, are the most important. The quadrated 

 spaces at the interstices, and liraa extending longitudinally over the lower 

 carina), have a beautiful effect as regards the sculpture. The colour is either 

 pale chestnut, dark chestnut, brown, or blackish. The two other species from 

 the same region, M. gracillima and zmitampirf (of which the latter has since 

 occurred in the Gulf of Oman, lat. 24° 58' N., long. 5G° 54' E., 156 fathoms), 

 differ in size, colour (both being white), and, in the case of M. gracillima, in 

 squareness of aperture. A general family likeness, however, pervades all the 

 members of this exquisite genus. This new species, and also the next, will be 

 figured subsequently. 



SOLARIUM (TORINIA) ADMIRANDUM, sp. n. 

 S. testa parva, depresso-discoidali, late perspective umbilicata, alba, delicata ; 

 anfractibus quatuor, quorum apicalis profunde submersus, huic proximus 

 * xipvov xapiWiov, from the chestnut colour. 

 t Proc. Zool. Soc. 1901, vol. ii, pp. 379, 380, pi. xxii, figs. 18, 19. 



