606 EEV. B. BOOG WATSON ON THE 



right into a long, fine, scarcely reverted straight tube. Suture 

 very horizontal, much interrupted, slightly impressed at the 

 bottom of the angle in which the whorls meet. Mouth very 

 perfectly oval, slightly pointed in front, where there is a minute 

 cleft in the prominent lip-edge ; but beyond this the canal is en- 

 tirely closed. Outer lip projects quite straight as a thin prominent 

 edge considerably in advance of the last varix. Inner lip exactly 

 similar to the outer lip, with which it is continuous above, and 

 from which it is only separated below by the minute cleft of the 

 canal ; behind it is a strong furrow, bordered to the left on the 

 body by one of the varices, and in front by the lines of vaulted 

 spines of the old canal-ends. Operculum pointedly ovate, has a 

 small, somewhat elongated, anterior terminal apex, and is scored 

 across outside with curved, thin, imbricated, rather distant 

 lamellse. H. 0-72 (length of canal 0-3). B. 0-35. Penultimate 

 whorl, height 0-08. Mouth, height (without the canal) 0-16. 



This pretty little species is very like T. Cleryi, Petit, from New 

 Zealand ; but in that the embryonic apex is finer and more pro- 

 minent, the spire is higher, the base is more inflated, the whole 

 last varix is much stronger, and on the base the varices have no 

 hollow spines as in the ' Challenger ' species. Typhis duplicattos, 

 Sow., has the embryonic apex very similar, but is higher and finer 

 in the spire, has only three regular rows of hollow spines, and 

 these do not extend to the base. Murex cirrosus, Hinds, is very 

 like in form and general aspect, but has strong spiral threads on 

 the whorls, is more contracted in the base, and has an open 

 canal. Mr. Edgar Smith had the kindness to compare for me 

 the ' Challenger ' species with T. Yatesi, Crosse ; and writes : — 

 " In your species the whorls are not so constricted at the base, 

 and the tabulation or upper slope is oblique. In T. Yatesi they 

 are much constricted, and the tabulation is horizontal. The 

 number of varices is the same ; but the ornamentation of them is 

 difierent. Crosse describes his ' peculiariter cristato-denticu- 

 latis,' whilst your's have hollow conical spines or hooks. The 

 hollow tubes, too, in your shell are directed nearly at right 

 angles to the axis ; in T. Yatesi they are obliquely upward-in- 

 clined. Beneath these in yours I see a small prominence, which 

 is not present in the other. The type, however, is a very worn 

 shell ; and it is possible that in fine specimens these prominences 

 might exist, and the varices be more spinous ; but the shape of 

 the whorls and the direction of the tubes would remain the same." 



