MOLLTTSCA OP TEE ' CHALLENGER' EXPEDITION. 125 



Whorls 7, excluding those of the embryonic apex, flat, contracted 

 upwards on the spire, on the base contracted downwards and 

 produced. Suture invisible, in the bottom of a deep narrow 

 furrow. Mouth minute, roundly oval, with a rather large round 

 canal, which turns in at the back of the pillar. Outer lip con- 

 tracted. Pillar very short, strong, rounded and pointed. Inner 

 lip thick and strong, and on the pillar projecting so as to leave 

 rather a deep fissure behind it. H. 0*087. B. 0045. Penulti- 

 mate whorl, height 0*019. Mouth, length 0-016, breadth 0*014. 



This beautiful little species very much resembles C. pulchella, 

 C. B. Ad., from the "West Indies; but that is a slenderer shell, 

 being longer in proportion to its breadth, and has a longer pillar ; 

 its whole system of sculpture also is more delicate. 



2. Cerithiopsis fayalensis, n. sp. 



St. 75. July 2, 1873. Lat. 38° 38' N., long. 28° 28' 30" W. 

 Fayal, Azores. 450-500 fms. Sand. 



Shell. — Small, narrow, conical, not contracted on the base, reti- 

 culated, tubercled, with a marked sutural furrow, of a light ruddy 

 brown. Sculpture. Longitudinals — there are on the last whorl 

 from 15 to 25 small, straight, longitudinal ridges, parted by 

 narrow deepish furrows ; they cross the whorls a little obliquely, 

 and run pretty straight down the spire from whorl to whorl, 

 with a slight sinistral twist. Spirals — there are on each whorl 

 three equal rounded threads, which rise into rounded tubercles 

 as they cross the longitudinal ridges ; they are parted by rather 

 narrow and deepish furrows. The bottom of each whorl is very 

 slightly constricted into the sutural furrow, which is thus a 

 little more distinct than the other furrows ; and from this the 

 succeeding whorl projects with a very straight and perpendicular 

 edge. This furrow encircles the edge of the base, which is 

 sharply defined and contracted by a spiral thread, whose rounded 

 edge projects a little prominently on the inner side of the furrow. 

 On the base the microscopic markings, irregular hair-like lines 

 of growth, and very faint spirals are most visible. Colour uni- 

 form light ruddy brown. Spire high, narrow, pointed, very 

 slightly scalar, with very slightly convex contour lines. Apex 

 broken. Whorls (excluding the embryonic) 11, straight, or very 

 slightly convex on the side; the base is very flat and hardly 

 conical. Suture only recognizable from the furrow in which it 

 lies. Mouth very small, narrowly oval, with a small, but well- 

 marked sinus at its upper outer corner, and with a largish and 



