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



5. Actceon turritus, Watson (PL XLVII. fig. 2). 



Adceon turritus, "Watson, Prelim. Report, pt. 18, Journ. Linn. Soc. Lond., vol. xyii. p. 285. 



Station 24. March 25, 1873. Lat. 18° 38' 30" N., long. 65° 5' 30" W. Off 

 Culebra Island, West Indies. 390 fathoms. Pteropod ooze. 



Shell. — Strongish, oblong, pale yellow, translucent, somewhat glossy, with a high 

 conical coarsely tipped spire and rounded striated whorls. Sculpture : Longitudinals — 

 there are many feeble lines of growth. Spirals — the surface of the shell is scored with 

 narrow, shallow, irregular, unequal, distant furrows formed by hardly continuous sfipplings, 

 which are round on the upper and oblong on the last whorl ; between these furrows there 

 often occurs a weaker one formed in "the same way ; on the base they are small and 

 crowded ; toward the upper suture they are strong ; on the first in particular they are so. 

 Colour : the shell itself is translucent white, but is covered with a very thin yellow mem- 

 branaceous epidermis. Spire high, conical, and scalar. Apex very coarse and blunt, 

 slightly immersed, but not inverted. WJwrls 6, rounded above, cylindrical below ; the last 

 is short and slightly tumid. Suture very little oblique, strong and somewhat channelled. 

 Mouth oval to pear-shaped. Outer lip leaves the body at a right angle ; it is regularly 

 arched throughout, patulous in front. Inner lip : a thin defined glaze crosses the body 

 and runs direct down the pillar with a straight sharp edge, behind which is a minute 

 chink; the tooth, which is close up to the body, is very slight and blunt. H. - 31 in. 

 B. 0-18. Penultimate whorl, height 0-08. Mouth, height 0*17, breadth 0'1. 



This species is represented by only one specimen, of which the outer lip is somewhat broken. 

 The spire is extremely high and scalar. In this respect, and in the rounded form of the whorls, it 

 somewhat resembles Adceon (Solidula) suturalis, A. Adams; but the apex is much blunter, and the 

 sculpture much finer than in that species. 



6. Actceon austrinus, Watson (PL XLVII. fig. 3). 



Actwon austrinus, Watson, Prelim. Report, pt. 18, Journ. Linn. Soc. Lond., voL xvii. p. 286. 



Station 162. April 2, 1874. Lat. 39° 10' 30" S., long. 146° 37' E. Off East Mon- 

 coeur Island, Bass Strait. 38 to 40 fathoms. Sand and shells. 



Shell. — Small, thin, ovate, strongly striated, with a high conical spire, blunt tip, and 

 tumid body-whorl. Sculpture: Longitudinals — the lines of growth are very faint and 

 somewhat markedly oblique. Spirals — the whole surface is scored with strong equal 

 furrows which are about half the breadth of the interstices : these furrows are not stippled, 

 but are delicately and regularly cut across on the lines of growth by fine threads : there 

 are about 20 of these furrows on the body and about 9 on the penultimate whorl. Colour 

 porcellanous, with a glossy surface. Spire rather high, conical, subscalar. Apex rather 



