252 PROCEEDINGS OF THE JI ALACOLOGICAL SOCIETY. 



tlie suturos of each whorl, this space being quite plain and free from 

 any sculpture iu M. Smithii. 



Clathukella ditylota, n.sp. PI. XII, Fig. 17. 



M. testa fusiformi, solidula, ])allide albo-ciuerea, vel carneola, 

 anfractibus 9, apicalibus duobus globulosis subvitreis, loevissimis, 

 inclusis, tcrtio et interduin quarto anfractu simpliciter spiraliter 

 carinulatis, aliter la^vihus, ctetoris longitudinaliter crassicostatis, et 

 spiraliter bicarinatis, ad juncturas costarum acutigemmatis, idtinio 

 anfractu tricarinato, siniul ac usque ad basim 8-10, spiraliter liratulo, 

 uuiuero costarum ultimum apml anfractum circa 9-10, undii^ue apud 

 suturas impressis, infra, juxta sutuias rufo vel castaneo tinctis, simul 

 ac versus basim, apertura ovata, labro paiillum expanse, iiicrassato, 

 sinn perlato, albo, rutimargiuato, margiue columellari biplicato vel 

 bitul)erculato. Long. 7, lat. 2 mm. 



Ilah. — Persian Gulf, Koweit, 10 fathoms; Bunder Abbas, 10 fathoms 

 (April 24, 1907); Henjam Island, 5-10 fathoms. 



A -well-known species, hitherto named C. Polynesiensis, Keeve, 

 but it does not agree with the specimens so named from Polynesia, 

 New Caledonia, Lifu, and other Eastern localities. Some examples 

 exist in the British Museum (Nat. Hist.) labelled ' Borsonia, sp.', the 

 chief characteristic of this sub-genus being displayed in the typical 

 fossil described in 184G by Bellardi,' as B. prima, where midway on the 

 columella two or more plications, superhcial or otherwise, appeared, 

 being probably a continuation, at right angles, or in an ascending 

 line, of the spiral liroe round the base of the body-whorl. B. nigro- 

 cmcta, Mont., is a typical recent representative of this section, wliich 

 seems to appertain on one liand to GJypliostoina, on the other to 

 Mangilia. In the present state of uncertainty as to the limitations 

 of these genera (or perhaps sections of one vast genus), we prefer 

 consielering the species now under discussion as a 3Iangilia for the 

 present. AVe have received it also from Townsville, Queensland 

 (A. TJ. Henn). Its principal allies appear to be Clathurella rava, 

 Hinds (Conch. Icon., Pleurotoma, pi. xxviii, fig. 250); Grayi, Reeve 

 (id., pi. xxvi, fig. 232); vuUuom, Keeve (id., pi. xxx, fig. 273); and, 

 perhaps, scalarina, Desh. (Conch. I. Pieunion, 1863, p. 109). 



{hh, Tu\a>T09, with two tubercles or plicae.) 



Pleukotomella evadne, n.sp. PI. XII, Fig. 18. 



PL testa parva, multum abbreviata, obesa, crassiuscula, alba, 

 anfractibus ad 6, quorum apicales tres pulchre decussati sub lente, 

 apice ipso laevi, globoso, caeteris tribus ad suturas impressis, turaidis, 

 longitudinaliter obli(]ui - costatis. costis crassis, numero anfractum 

 apud ultimum circa 18, spiraliter liratis, liris liaud numerosis, rudibus, 

 interstitiis squarrose alveolatis, ultimo a medio ad basim simpliciter 

 transversim lirato, labro pauUum expanso, apertura oblonga, intus 

 alba, canali brevi. Long. 4, lat. l"55mm. 



Hah. — Persian Gulf, Mussandam, at 55 fathoms. 



^ Bull. Soc. Geol. France, vol. x, p. 30. 



