316 THE VOYAGE OF H.M.S. CHALLENGER. 



waved, distinct, lying in the broad open angulation in which the whorls meet. Mouth 

 elongately oval, pointed above and below, slightly oblique. Outer lip thin, curved, with 

 an angulation at the shoulder where the very feeble sinus occurs. Inner lip spreads 

 thinly but a little broadly on the body ; it is concave above and straight down the 

 slightly channelled pillar, which is a little truncate, with its blunt-edged, slightly twisted 

 point. H. 0-67 in. (?) B. 0'28. Penultimate whorl, height 0*14. Breadth of first 

 remaining whorl - 08. Mouth, height - 29, breadth 0"15. 



This species belongs to the large group of northern forms which gather round Pleurotoma (Bcla) 

 turricula, Mont, and especially resembles Pleurotoma (Bela) nobilis, Moller, but is higher and nar- 

 rower, with a shorter smaller body-whorl, a much shorter and quite unemarginated snout ; the details 

 of sculpture, too, are quite different. 



47. Pleurotoma (Typhlomangelia) pyrrha, 1 Watson (PI. XXV. fig. 6). 



Pleurotoma (Drillia) pyrrha, Watson, Prelim. Report, pt. 8, Journ. Linn. Soc. Lond., vol. xv. p. 409. 



Station 233. May 17. Lat. 34° 39' K, long. 135° 14' E. Kobi, Japan. 8 fathoms. 

 Mud. 



Station 233a. May 19, 1875. Lat. 34° 38' K, long. 135° 1' E. Kobi, Japan. 50 

 fathoms. Yokohama, Japan. Sand. 



Shell. — High, narrow, conical, with a longish, somewhat contracted, conical base 

 running out into a largish snout, obliquely ribbed, and covered with spiral threads ; the 

 suture is slightly constricted. Sculpture : Longitudinals — there are on the last whorl 1 3, 

 on the first regular whorl 8, oblique, rounded ribs, which are obsolete at the top of the 

 whorls, extend to the lower suture, but die out on the base ; they are parted by shallow 

 rounded furrows, rather wider than they are : the hues of growth are harsh and numerous. 

 Spirals — at the top of each whorl is a slight swelling, 2 carrying two stronger and many 

 feebler flat spiral threads. The sinus-area is scored by fine, but irregular, spiral threads. 

 The whole of the rest of the surface is covered by rounded spiral threads, which are 

 alternately stronger and finer ; on the snout the finer ones disappear, and the stronger 

 ones become sparser ; the three highest of the stronger ones rise into slight knots on the 

 ribs. Besides all these, the whole surface is delicately and regularly scratched micro- 

 scopically. Colour porcellanous white, very much stained in the interstices of the ribs, 

 and especially on the larger spiral threads, with tawny or light- chestnut colour, which is 

 also seen on the point of the pillar and canal. Spire high and conical, its profile-lines 

 somewhat broken by the angular prominence of the ribs and by the rounded constriction 

 of the suture. Apex broken. Wliorls 10 (remaining), of regular rather rapid increase, 

 short, contracted above, expanding below, angulated by the projection of the ribs, but 



1 Tugsdc, tawny. 



2 These do not appear in the figure, in which, too, the longitudinal ribs are too crowded. 



