244 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



perlaeves, apice ipso planato, secimdo aufractu glohulari, tuniescente, 

 caiidido, cseteris qiiatiior apud sutuias niultum iiupressis, supernis 

 undique carinis duabus centralibtis acutis ])r0editis, simul ac tertia 

 cannula supra, juxta suturas, ultimo ad medium tribus carinis ornato, 

 quarta carina ad basim excavatam, circa umbilicum, apertura fere 

 rotunda, labro tenui, tridentato, cauali brevi, columella fere recta. 

 Lonp:. 6, lat. 3 ram. 



Hah. — Pei'siau Gulf, Mussandam, at 55 fathoms. 



The type of this o:enus, former!}' known as Sepnratlda, Gray, is the 

 L. cornu, Gmeliu. It was established by Montfort in 1810, and has 

 priority of thirty-seven years. Our new species is a beautiful and 

 delicate shell, much impressed suturally, very acutely bi- or tricariiuite 

 spirally, with swollen and somewhat flattened polislied wliite nucleus. 

 Some superficial likeness to the ^euns MafJiilda, Semper, is noticeable, 

 but in this last genus the nuclear whorls are heterostrophe, Tlie 

 nearest ally to the L. tropcBum is undoubtedly the smaller L. zodiocus, 

 Hedley, from Mast Head Reef, North Queensland, where it was 

 dredged at 17-20 fathoms off !Mast Head.' There are about seven 

 species of this genus kiiown at tlie present time, of which four are 

 found in Australian seas, and this is the third discovered to exist in 

 the Persian Gulf region, 



llissoA (Amphithai.amus) Alphesibcei, n.sp. PI. XI, Fig. 5, 

 A. testa fusiformi, sfepe paullum incurva vel insequali, albo-lactea, 

 tenui, subpellucida, apice planato, laevigata, anfractibus, duobus 

 inclusis apicalibus, ad 8, ventricosulis, apud suturas impressis, 

 undique delicatissime spiraliter striatulis, apertura ovata, peristomute 

 paullum incrassato, fere continuo, margine columellari simplice, 

 obliqua. Alt. 5, diam. 2 mm. 



JIab. — Persian Gulf, Henjam Island, and Arabian Sea, Karachi. 

 A species large for its genus, and sometimes incurved, white, 

 slightly pelluceut, beautifully spirally striolate, of which not very 

 many examples have j-et come to light. It is named after the 

 ' Pastor Alphesiboeus ' — in fanciful allusion to his staff or crook, which 

 this elongate, incurved species may be supposed to resemble in form. 



llissoA (Amphithalamus) Akist^i, n.sp. PI, XI, Fig. 6. 



A. testa minuta, alba, fusiformi, subpellucida, ad apicem late 

 planata, vitrea, anfractibus, apicalibus 2 inclusis, ad 6, suturaliter 

 multum impressis, undi(][ue spiraliter fortiter sulcato-striatis, striis 

 regularibus, arctis, conspicuis, apertura ovata, peristomate fere 

 continuo, hand multum incrassato, columella obliqua. Alt. 3'50, 

 diara. 1 mm. 



JIah. — Bombay (A. Abercrombie). 



A very small, but well-defined species. Conspicuous for its regular, 

 strong, and close sulco-striation, the whorls well impressed suturally, 

 apex smooth, much and broadly flattened, swollen below, and vitreous. 



(Aristseus, a shepherd, cf. Virgil, G. iv, 317). 



' Hedley, Proc. Linn. See. N.S.W., vol. xxxii, p. 502, pi. xviii, fig. 30, 

 1907 ; also loc. cit., vol. xxvii, p. 23, 1902. 



