1422 THE VOYAGE OF H.M.S. CHALLENGER. 



4. Lopliocorys quadricornis, n. sp. 



Shell rough, slenderly ovate, with two distinct strictures. Length of the three joints = 2 : 4 : 2, 

 breadth = 2:4:3. Cephalis ovate, with four very stout, three-sided prismatic horns ; the largest 

 is as long as the thorax and vertical upon the apex, the three smaller are as long as the cephalis 

 and diverge upwards from the base of the former. Thorax ovate, with large, irregular, roundish 

 pores, which are three to four times as broad as the small, circular pores of the first and the third 

 joint. Constricted mouth half as broad as the thorax. 



Dimensions. — Length of the three joints, a 0-045, h 0-085, c 0-04 ; breadth, a 0-035, I 0-075, c 0-06. 



Habitat. — South Atlantic, Station 332, depth 2200 fathoms. 



5. Lophocorys hovicornis, n. sp. (PI. 69, fig. 12). 



Shell rough, subovate, with two deep strictures. Length of the three joints =1:2:3, breadth = 

 1:3:4. Cephalis subspherical, with two divergent, curved horns of different lengths. Thorax cam- 

 panulate, with small, circular pores. Abdomen subspherical, truncate at both poles, twice as 

 broad as the constricted mouth, thorny, with very large, circular pores, four to six times as broad as 

 those of the smaller thorax. 



Dimensions. — Length of the three joints, a 0-03, h 0-06, c 0-09 ; breadth, a 0-04, h 0-09, c 0-12. 



Habitat. — Central Pacific, Station 270, depth 2925 fathoms. 



Genus 622.. Theocampe,^ n. gen. 



Definition. — T heocorida (vel Tricyrtida eradiata aperta) with ovate abdomen, 

 broader than the constricted mouth. Cephalis without horn. 



The genus Tlieocampe differs from the two preceding genera in the absence of horns 

 on the cephalis, and may, therefore be derived from Theocorys by reduction of the 

 apical horn. It bears to the latter the same relation as Tricolocampe does to Tlieocyrtis. 



Subgenus 1. Theocampana, Haeckel. 



Definition. — Pores of the thorax and the abdomen of nearly equal size and similar 

 form. 



1. Theocampe ehrenhergii, Haeckel. 



Didyomitra ehrenhergii, Zittel, 1876, Zeitschr. d. deutsch. geol. Gesellsch., ji. 82, Taf. ii. 

 fig. 5. 



Shell ovate, smooth. Length of the three joints = 2: 3: 13, breadth = 4: 7: 12. Cephalis 

 hemispherical. Thorax truncate, conical. Abdomen inflated, nearly spherical, twice as broad as 

 the constricted mouth. Pores of nearly equal size and form, small, regular, circular. 



1 Theocampe = Di\{ne caterpillar ; hog, nafivji. 



