MKLVILI- : MOLLUSCA FROM PKKSIAN GULF, ETC. 253 



An infrequent little species, the sculpture much like that of 

 P. ainpliihlestnim, Melv., from the Gulf of Oman, but the form is 

 peculiar, being mucli abbreviate, and almost rotund, the nuclear 

 whorls are beautifully microscopically decussate, outer lip slightly 

 expanded, canal very short. 



Plkurotomell.v hypekmnkstka, n.sp. PI. XIF, Fig. 19. 



PI. testa fusiformi, gracili, pallide albo-straminea, delicata, 

 anfractibus ad 8, quorum apicales tres ochracei, parum nitidi, ligves, 

 quartus ochraceus, delicatissime dectissatus, casteris ad suturas 

 irnpressis, infra, juxta suturas leniter declivibus, delude fere rectis, 

 longitudinaliter costulatis, costis baud numerosis, anfractus ultiiui 

 circa 1 0, et spiraliter liratis, liris rudibus, interstitiis oblongo-squarrosis, 

 apertura oblonga, labro incrassato, albo-stramineo, sinu lato, haml 

 profundo, canali brevi, columella fere recta, simplice. Long. 6, 

 I at. 2 mm. 



Ilab. — Persian Gulf, ^lussandam, 55 fathoms. 



A well-marked elegant form, neater and finer in sculpture tlian the 

 allied P. amphihlestrum, Melv.,^ from a neighbouring locality.' It 

 seems to come in sequence next to this species, or P. Alcestts, also 

 from the Gulf of Oman, described subsequently (1906). 



Cylichna mecyntea, n.sp. Pi. XI, Fig. 15. 



C. testa tenui, perangusta, famelica, nitida, alba, cvlindrica, recta, 

 apud extremitates an;bas indistincte striolata, aliter perla^vi, apertura 

 angusta, ad basim latiore, columella ad medium recta, labro tenui, 

 recta. Alt. 6, diam. 1'50 mm. 



//ftJ. — Persian Gulf, Ormara, 1910. 



A remarkable species, more peifecfly narrowly cylindrical in 

 form than any other of the genus with which we are cognizant, the 

 aperture being equally narrow centrally, widening at either end, 

 especially basally, and the whole surface quite smooth excepting for 

 some obscure striolation at either extremity. Only one specimen has 

 yet occurred. 



{/iUjKvi'Tco^, lengthened out.) 



AtYS CUELIDON, u.sp. PI. XT, Fig. 16. 



A. testa oyata, delicatissima, albo-cinerea, j)ellucida, effusa, 

 pauUulum utrimjue producta, antice simul ac postice spiraliter 

 striata, striis sulcatulis, claris, decisis, utrinque circa 14, superticie 

 centrali Inevissima, apice uniplicato, labro paullum effuso, tenuissimo, 

 apertura lunari, angusta, columella obscure uniplicata. Alt. 12, 

 diam. 6-50 mm. 



Ilab. — I'ersian Gulf, Mussandam, at 55 fathoms, 1907 

 A very delicate, extremely pellucid At//s, whitish, vitreous, inflated, 

 smooth centrally, and endowed with clearly cut spiral sulculose striae 



' Proc. Mai. Soc. Lond., vol. vi, p. 58, pi. v, fig. 7, 1904; and loc. cit., 

 vol. vii, p. 78, pi. viii, tig. 23, 1906. 



