1492 THE VOYAGE OF H.M.S. CHALLENGER. 



is little constricted towards the mouth. The greatest breadth is in the middle of the shell. 

 Cephalis hemispherical, with a small, conical horn of the same length. Pores large, circular, of 

 variable sizes. Dedicated to Dr. Eeinhold Teuscher. 



Dimensions. Length of the shell (with four joints) 016. Length of the single joints, a G'015, 

 b 0-02, c 0-07, d 0-055 ; breadth, a 0'03, I 0-05, c 0'08, d 0-06. 



Habitat. Central Pacific, Stations 266 to 274, depth 2350 to 2925 fathoms. 



13. Eucyrtidium biitschlii, n. sp. (PI. 77, fig. 7). 



Shell rough, slender, ovate, truncate, with three distinct strictures. Four joints of different 

 lengths ; the third is the largest, inflated, subspherical. Fourth joint subcylindrical, little constricted 

 towards the truncate mouth. Cephalis hemispherical, with a small, conical horn. Pores circular, 

 much larger in the third joint than in the three others. 



Dimensions. Length of the shell (with four joints) 016. Length of the single joints, a 0'02, 

 b 0-03, c 0-06, d 0'05 ; breadth, a 0'03, b 0'07, c 0'09, d 0'07. 



Habitat. North Pacific, Station 244, depth 2900 fathoms. 



14. Eucyrtidium galathea, Ehrenberg. 



Eiicyrtidium galathece, Ehrenberg, 1854, Monatsber. d. k. preuss. Akacl. d. Wiss. Berlin, p. 242. 



Shell smooth, campanulate, with three deep strictures. Four joints of different lengths ; the 

 fourth joint is the broadest, twice as long as the third and the second, three times as long as the 

 hemispherical cephalis, which bears a stout, pyramidal, oblique horn of twice the length. Mouth 

 little constricted. Pores regular, circular, in transverse rows, three rows in each of the three first 

 joints, five or six rows in the last joint. 



Dimensions. Length of the shell (with four joints) 012 ; length of the fourth joint 0'05, 

 breadth 0'07. 



Habitat. Tropical Atlantic, Station 347, depth 2250 fathoms. 



15. Eucyrtidium galea, Haeckel. 



Eucyrtidium galea, Haeckel, 1862, Monogr. d. Eadiol., p. 324, Taf. vii. figs. 8-10. 

 Litliocampe galea, Haeckel, 1860, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, p. 838. 



Shell smooth, helmet-shaped, with four sharp strictures. Five joints of different lengths. 

 Cephalis small, spherical, with a thin pyramidal horn of the same length. Second joint conical, 

 about as long as the third, longer than the fourth and the fifth joints. The third joint is the 

 broadest. Pores regular, circular, small and numerous. 



Dimensions. Length of the shell (with five joints) 018 ; length of the second and the third 

 joints 0-05, of the fourth 0'03 ; breadth 0'08 to 01. 



Habitat. Mediterranean (Messina), surface. 



