1706 THE VOYAGE OF H.M.S. CHALLENGER. 



Genus 717. Tuscarora,^ Jolin Murray, 1876, in schedulis, Chall. Coll. 



' Definition. — T uscarorida with three radial aboral feet, and a variable number 

 of circoral teeth. 



The genus Tuscarora comprises seven of the ten observed species of Tuscarorida, 

 all seven agreeing in the possession of three perradial feet, which alternate originally 

 (in four species), with three interradial teeth surrounding the mouth. The latter is 

 armed in two other species with two teeth, and in one species with four teeth (compare 

 above, p. 1704). The three perradial feet have a similar position as in the tripodal 

 Nassellaria, so that they may be distinguished as an odd caudal foot and two paired 

 lateral feet. 



Subgenus 1. Tuscarantha, Haeckel. 



Definition. — Shell with three perradial equidistant feet and three interradial 

 equidistant circoral teeth, alternating regularly with the former. 



1. Tuscarora bisternaria, John Murray (PL 100, figs. 1, la). 



Tuscarora bisternaria, John Murray, 1879, in litteris, Karr. ChalL Exp., vol. i. p. 226, pi. A, 

 figs. 16, 16a. 



Shell subsplierical, with three lateral perradial feet in the equatorial zone, and three basal 

 interradial teeth around the mouth, alternating regularly with the former. The three lateral feet 

 arise either in the equator itself or a Uttle above it, and are nearly horizontally expanded, descending 

 a little towards the aboral pole. They are straight, cylindrical, twice to four tunes as long as the 

 shell, geniculate at the inflated base, and covered with small thorns. A circle of six to eight basal 

 pores in the base of each foot. The narrow mouth is triangular, surrounded by the thorny, inflated, 

 subsplierical basfs of the three long, cylindrical, diverging, thorny teeth, which ascend obliquely and 

 are longer than the shell ; each tooth exhibits in the upper part of the inflated base a corona of 

 eight to ten ovate holes. 



Dimensions. — Length of the shell 2-0, breadth 1'5. 



Habitat. — Central Pacific, Station 264, depth 3000 fathoms. 



2. Tuscarora murrayi, n. sp. (PI. 100, fig. 2). 



Shell pear-shaped, with three circoral perradial feet in the upper third and three basal 



interradial teeth around the mouth. The three lateral feet are thin, cylindrical, arcuate, very 



bristly, arise immediately beyond the narrow tubular peristome, and ascend obliquely nearly to the 



height of the mouth ; then they are curved downwards in a large arc, three to four times as long as 



1 Tuscarora, named from the American sliip " Tuscarora," commanded by Captain Bellcnap, wliicli made a 

 splendid series of deep-sea soundings in tlie Pacific Ocean in 1875. 



