1220 THE VOYAGE OF H.M.S. CHALLENGER. 



similar to that of the cephalis, in the middle part by a single row of arches separated by thin 

 threads, and in the lower part by a narrow band of arachnoidal network. Dedicated to Dr. John 



Murray. 



Dimensions. Cephalis 0'05 long, 0'05 broad ; thorax 0'0'04 long, 015 broad ; apical distance of 

 every two feet 015, of each foot and the horn 017. 



Habitat. Central Pacific, Station 271, depth 2425 fathoms. 



2. Clathrocorys teuscheri, n. sp. (PL 64, fig. 10). 



Cephalis pear-shaped, with irregular, square pores. From the centre of its base there arise seven 

 prismatic, radial beams of equal strength, supporting the lattice-work of the wall ; the single verti- 

 cal beam is prolonged into the apical horn ; six others lie in the three meridian planes (between the 

 horn and each foot) ; three ascending end in the wall of the cephalis, three descending are prolonged 

 into the three strong feet, which are longer than the horn. In each meridional plane there arise four 

 thicker and several thinner bars, which by communication of their ramules form the three latticed 

 wings ; each wing with a single very large mesh, two meshes of medium size, and a narrow marginal 

 band of small, square pores. The three walls of the flat pyramidal thorax are formed in the upper 

 part by squarish network similar to that of the cephalis, in the lower part by a narrow band of 

 the same ; between them a large hole. Dedicated to Dr. Eeinhold Teuscher. 



Dimensions. Cephalis 0'05 long, 0'04 broad; thorax 0'06 long, 015 broad ; apical distance of 

 every two feet 0'2, of each foot and the horn 0'2. 



Habitat. Central Pacific, Station 272, depth 2600 fathoms. 



3. Clathrocorys giltschii, n. sp. (PI. 64, fig. 9). 



Cephalis pear-shaped, with irregular, polygonal pores. From the centre of its base there arise 

 seven prismatic, radial beams of different strength ; the single vertical beam bears six lateral branches 

 (parallel to the three ascending supporting beams), and is prolonged into the apical horn ; six others 

 lie in the three meridional planes (between the horn and each foot) ; three weaker ascending beams 

 end in the wall of the cephalis, three stronger descending are prolonged into the three large diver- 

 ging feet, which are twice as long as the cephalic horn. The network of the three wings and of the 

 three-sided pyramidal thorax is about the same as in the preceding species, but much more developed ; 

 the marginal bands with the squarish network are much broader, and an arachnoidal wicker-work of 

 very thin thread-like bars fills out the large meshes. Dedicated to Mr. Adolf Giltsch. 



Dimensions.- Cephalis 0'04 long, 0'04 broad; thorax 012 long, 0'2 broad; apical distance of 

 every two feet 0'24, of each foot and the horn 0'2. 



Habitat. Central Pacific, Station 274, depth 2750 fathoms. 



Genus 546. Eucecryphalus, 1 Haeckel, 1860, Monatsber. d. k. preuss. 

 Akad. d. Wiss. Berlin, p. 836. 



Definition. S ethopilida (vel Dicyrtida triradiata aperta) with three free collar 



1 Eiicecryphalus=Nice net-cap ; <T, zi 



