MOLLTJSOA OF THE * CHALLENGEB ' EXPEDITION. 391 



on the edge of the body and pillar, at the point of which it crosses 

 and lies hidden behind the sharp canal-edge. H. 0'45. B. 0"2. 

 Penultimate whorl, height O'OS. Mouth, height 0'28, breadth 

 009. 



This pretty little species perhaps resembles T. harvicensis, 

 Johnston, more than any other, but, besides being more attenuated, 

 is markedly differentiated by the median angulation of the whorls 

 and the absence of the spiral threads of that species. 



5. Teophon septus, n. sp. 



St. 149 D. Jan. 20, 1874. Lat. 49° 28' S., long. 70° 13' E. 

 Eoyal Sound, Kerguelen. 28 fms. Mud. 



Shell. — Thin, porcellaneous white, club-shaped, with a low 

 scalar spire, blunt apex, high-shouldered sharply expressly and 

 spinously keeled whorls, a tumid body, and a long thiu flex- 

 uous snout. Sculpture. Longitudinals — the whorls are scored 

 by feeble lamellpg and by coarsish lines of growth. Spirals — at 

 the top of each whorl, but separated from the suture by a broad 

 tabulation, is a right-angled keel, from which, nearly parallel to 

 the axis of the shell, project a series of hollow, vaulted, compressed 

 triangular spines ; besides this coronal there is no other spiral 

 sculpture except some irregular lines on the base. Colour por- 

 cellaneous white, with some chalkiness on the surface. Aj^ex 

 rather small, mamillate, and a little turned down on one side. 

 Whorls 5 or 6, flatly tabulated above, with a rectangular keel, 

 below which they are cylindrical; the last is a little tumid 

 on __the base, which contracts rapidly and is drawn out into 

 a long, thin, flexuous snout. Suture almost rectangular. Mouth 

 round, with a blunt angle at the top and a siphon at the keel, 

 and suddenly prolonged into the narrow canal. Outer lip sharp, 

 thin, direct, well arched, not prominent. Inner lip is concave 

 above, slightly oblique on the very short pillar, and much more 

 BO on the long, bent, and slightly reverted snout ; a thin narrow 

 glaze defines it to the point of the pillar, where it crosses to 

 the canal, leaving a minute chink on its outer edge above. Oper- 

 culum thin, yellow, oval, with a blunt apex, where the nucleus is 

 terminal. H. 091. B. 0-43. Penultimate whorl, height O'l. 

 Mouth, height 0-67, breadth 016. 



The upturned coronal of hollow spines and the more contracted 

 base differentiate this from T. Goodridgii, Forbes. It has some 

 faint resemblance to the Pleurotoma cedo-nulli, Eeeve. 



