from the Persian Gulf, dbc. 149 



umbilicus very small and narrow, columella oblique. The 

 nearest approach to this may be F. (Coutkoio/Li) obtusa, 

 A. Ad., from California, by some authors deemed an Isapis ; 

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

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

 yet 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 cylindrico-fusifornri, pallide straminea, solidula ; an- 

 fractibus 16-17, quorum apicales 5 pulchre et minute longitu- 

 dinaliter striati, paullum decussati, apice ipso laevi, deplanato, 

 cneteris ad suturas profunde impressis, lateribus paullulum con- 

 vexis, quatuor supernis bi-, bis proximis triseriatis, ordinibus 

 nodulato-gemmatis decoratis, ultimo anfractu serie quarta prae- 

 dito, gemmis interdum versus basin evanidis, circa basin tribus 

 liris euccinctis ; apertura quadrata, peristomate tenui, canali 

 brevi, paullum recurvo. 



Long. 10, bit. 3 mm. 



Ilab. Persian Gulf : Fao Cable, 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 four, the lowest of them 

 sometimes has the gemmae partly evanescent, the base being- 

 encircled wiih 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. 5GG, pi. xlii. fig. 2. 



