REPORT ON THE EADIOLARIA. 1371 



nearly hemispherical, with circular pores of very different sizes. From the margin of its wide open 

 mouth descend four stout perradial ribs, which are forked at the distal end, and by communication 

 of their fork-branches form the four large, pentagonal holes of the abdomen. From the middle of 

 the lower margin of the holes descend four parallel, vertical, slender feet, about as long as the shell. 

 This species is dedicated to the memory of the great Reformer, Martin Luther. 



Dimensions. — Length of the three joints, a 0'03, h 0'06, c 006 ; breadth, a 003, h 0'08, t 01. 



Habitat. — Western Tropical Pacific, Station 225, depth 4475 fathoms. 



2. Alacorys tetracantha, Haeckel. 



Podoeyrtis tetracantha, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 82, Taf. xiii. 

 fig. 2. 

 ? Podoeyrtis parvipes, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 82, Taf. xiv. 

 fig. 5. 



Shell rough, with distinct collar stricture. Length of the three joints = 1:3:5, breadth = 

 1:4:6. Cephalis subspherical, with a rudimentary conical horn. Thorax campanulate, with irregular, 

 roundish pores of different sizes. Abdomen inflated, with a small number of very large irregular 

 holes, intermingled with smaller roundish holes. From the margin of the wide open mouth descend, 

 nearly vertically, four strong vertical feet, which are about as long as the shell, and slightly curved, 

 with convex outlines. Podoeyrtis parvipes of Ehrenberg seems to be only a mutUated specimen of 

 this species. 



Dimensions. — Length of the three joints, a 0-02, h 0-06, c O'OQ ; breadth, a 0-03, h O'OS, c 0-13. 



Habitat. — Fossil in Barbados. 



Subgenus 2. Pentalacorys, Haeckel, 1881, Prodromus, p. 436. 



Definition. — Peristome armed with five feet, one of which is odd and occipital, 

 the other four paired aud lateral. 



3. Alacorys pentacantha, Haeckel. 



Podoeyrtis penta-cantka,EhtenheTg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 82, Taf. xvii. 

 fig. 1. 



Shell rough, with slight collar stricture. Length of the three joints = 1:2:3, breadth = 

 1:4:6. Cephalis subspherical, with a rudimentary conical horn. Thorax campanulate, with 

 subregular, circular, quincuncial pores. Abdomen wider, campanulate, with a small number of very 

 large and irregular, roundish holes. From the peristome descend five stout conical feet, which are 

 slightly curved and divergent, nearly as long as the shell. 



Dimensions. — Length of the three joints, « 0-02, h 0-05, c 0-06 ; breadth, a 0-025, h O'OS, c Oil. 



Habitat. — Fossil in Barbados. 



