386 BET. E. BOOG WATSON ON THE 



other two, though the ' Challenger ' species stands on the whole 

 nearer to Lesson's than v. Martens's species does to either. P. 

 ((7.) spinicincta, v. Mart., is distinguished by its high conical spire, 

 its^small apex, its more numerous carinal spines, its double basal 

 keel, and the sparseness of the muricated threads on its snout. 



Trophon, de Montfort. 



1. TfiOPHON ACANTHODES, U. Sp. (aKavQijh]s, prickly.) 



St. 308. Jan. 5, 1876. Lat. 50° 8' 30" S., long. 74° 41' "W. 

 "W. Patagonia. 125 fms. Mud. 



Shell. — Strongish, chalkily porcellaneous, yellowish, fusiform, 

 with a high scalar spire, small apex, sharply keeled and radia- 

 tingly spiked whorls, a rounded contracted base, and a long, nar- 

 row, but strong snout. Sculpture. Longitudinals — the surface is 

 scored with close, very irregular lines formed by the slightly raised 

 edges of thin imbricated procumbent lamellse, between which there 

 are almost microscopic scratches in the lines of growth ; there are 

 8 or 9 feeble oblique riblets on the lower part of the whorls ; 

 these die out on the base. Spirals — toward the upper part of 

 each whorl there is an acute angulation with an expressed rounded 

 keel, from which projects a coronal of longish rays or pointed, 

 up-turned, retroverted vaulted spikes, each of which forms the 

 origin of one of the longitudinal riblets ; below this keel there are 

 feeble, irregular, rounded threads, which may be recognized on the 

 snout. The whole surface is covered with very fine, close-set 

 rounded tbreadlets. Colour yellowish, with a singularly harsh 

 surface. Spire high, scalar. Apex mamillate, but small, consist- 

 ing of nearly three smooth, cylindrical, embryonic whorls, of 

 which the extreme tip is slightly immersed. Whorls 7 to 8, flat 

 above, sharply angulated, keeled and coronated, conically con- 

 tracted to the lower suture ; they are all small, but the last, 

 which is a little tumid, with a rounded base, very much con- 

 tracted and produced into a long, straight, spike-like snout. 

 Suture sharp and deep, in the bottom of the broad depression be- 

 tween the keels. Mouth club-shaped, being rather small and oval 

 above, and contracted below into the long, narrow, but patulous 

 canal. Outer lip roundly arched, angulated at the keel, where 



