1222 THE VOYAGE OF H.M.S. CHALLENGER. 



3. Eucecry2)fialus cuvieri, n. sp. 



Shell flatly conical, with slight collar stricture. Length of the two joints = 1:8, breadth = 2:10. 

 Cephalis hemispherical, with an oblic|Tie pyramidal horn twice as long. Thorax with straight 

 outlines and regular hexagonal meshes, increasing in size towards the mouth. From the collar 

 stricture there arise three stout conical spines, half as long as the thorax, and diverging downwards. 

 Peristome with a ring of small square pores and alternate conical divergent spines. Differs fi'om 

 the similar Clathrocyclas alcmence (PL 59, fig. 6), mainly in the simple apical horn and the possessiou 

 of the three collar fundamental spines. 



Dimensions. — Cephalis 002 long, 0'03 broad ; thorax 0'15 long, 0'2 broad. 



Habitat. — Tropical Atlantic, Station 342, depth 1445 fathoms. 



4. Eucecryphalus mulleri, n. sp. 



Shell flatly campanulate, of nearly the same structure as and similar form to that of the preceding 

 species. Differs from it mainly in the considerable size of the cephalic horn and the three collar spines, 

 which are bristle-shajjed and longer than the shell. Length of the two joints =1 : 4, breadth = 

 2 : 8. The peristome bears a double marginal ring of divergent conical spines, the upper being 

 directed upwards, the lower downwards. 



Dimensions — Cephalis 0'02 long, 0'04 broad ; thoi'ax O'OS long, 0'16 broad. 



Habitat. — North Pacific, Station 241, depth 2300 fathoms. 



. 5. Eucecryphalus gegenhauri, Haeckel. 



Eucecryphalus gegenhaui-i, Haeckel, 1862, jMonogr. d. Eadiol., p. 308, Taf. v. figs. 12-15. 

 Eucecryphalus gegenhauri, R. Hertwig, 1879, Organism, d. Radiol., p. 76, Taf. viii. figs. ,'>, 

 5(7, bh. 



. Shell flatly conical, campanulate, with slight eoUar stricture. Length of the two joints = 1:4, 

 breadth = 1:8. Cephalis hemisi^herical, with a conical horn of the same length, and very small 

 pores. Thorax about twice as liroad as high, with large, subregular, hexagonal meshes, increasing in 

 size downwards. In the upper half of the thorax the meshes are filled up by an extremely delicate 

 arachnoidal network. From the collar stricture there arise three divergent bristle-shaped spines half 

 as long as the thorax. Peristome with a double coronal of small square pores (the inner smaller and 

 more numerous than the outer), and with a single coronal of divergent marginal spines. This 

 cosmopolitan species is rather variable. 



Dimensions. — Cephalis 0'Q2 to 0'03 diameter; thorax O'l to 012 long, 002 to 025 broad. 



Habitat. — Cosmopolitan; Mediterranean,. Atlantic, Indian, Pacific, surface. 



