from the Persian Gulf } dec. 1 t9 



umbilicus very small and narrow, columella oblique. The 

 nearest approach to this may be F. (Couthouyi i) obtusa, 

 A. Ad., from California, by some authors defined an Tsapis ; 

 but this is a far coarser species in character and build. I 

 possess a large series of this and allied genera, very many 

 yel unnamed, and neither among these nor yet in the British 

 Museum have I been able to find its match. 



Triphora incolumis, sp. n. (PI. IV. fig. 18.) 



T. testa oylindrico-fusiformi, pallide straminea, solidula; au- 

 fractibus L6-17, quorum apicales 5 pulchre et minute longitu- 

 dinaliter striati, paallum decussati, apice ipso lae yi , deplanato, 

 coeteris ad Buturas profunde LmpressiB, Lateribus paullulum con- 

 vcxis, quatuor supernis bi-, his prozimis triseriatis, ordinibua 

 nodulato-gemmatis decoratis, ultimo anfractu serie quarta prge- 

 dito, gemmia interdam versus basin evanidis, circa basin tribus 

 liris succinctis ; apertura quadrata, peristomate tenui, canali 

 brevi, paullum recurvo. 



Long. 10, lat. J3 mm. 



Hub. Persian Gulf : Fao ( 'able, and along the north coast ; 

 not rare. 



A fine species, of pronounced character. Cylindro-fusiform 

 in shape, with channelled sutures, whorls (including the 

 five nuclear, three of which are very finely striate) 16-17 in 

 number, the lower whorls all ornamented with three equal 

 spiral regular rows of gemmae, shining, round, large propor- 

 tionately ; the body-whorl possessing tour, the lowest of them 

 sometimes has the gemmae partly evanescent, the base being 

 encircled with spiral plain ridges. Aperture somewhat 

 squarrose, peristome thin, canal shortly recurved, pronounced. 

 It may be compared with T. rufula, Watson, a somewhat 

 smaller species* (long. 7*5 mm.) from Wednesday Island, 

 Torres Stiaits. This is much of the same sculpture, with 

 channelled suture, the shell being of a ruddy yellow tint 

 throughout. It differs from T. idonea, M. & St., not only 

 in the channelled sutures and greater breadth of contour, but 

 in the mouth being more contracted. We have seen a live 

 albino form from Fao ; in this the fourth row of noduled 

 gemmae at the periphery of the basal whorl is extremely 

 distinct and perfect. 



* ' Challenger' Exp. xv. p. 566, pi, xlii. fi§ 



