1392 THE VOYAGE OF H.M.S. CHALLENGER. 



length. Pores subregular, circular, twice as broad in the inflated abdomen as in the campanulate 

 thorax, and four times as broad as in the cephalis. Outer coronal of the wide peristome with 

 fifteen to twenty conical, divergent feet, inner coronal with a smaller number of vertical, parallel, 

 divergent feet. 



Dimensions. Length of the three joints, a O03, I 0'05, c 0'05; breadth, a 0'03, b 0'08, c Oil. 



Habitat. North Atlantic, depth 1400 fathoms (Berrymann). 



Subgenus 2. Lamprocycloma, Haeckel. 

 Definition. Feet of the peristome forked or branched. 



7. Lamprocydas bajaderce, n. sp. 



Shell campanulate, very similar to the preceding species, but with stronger spines on the 

 abdomen and with different peristome. Length of the three joints = 2:2:3, breadth = 2:6:8. 

 Cephalis equal to that of Lamprocydas maritalis (PI. 74, figs. 13, 14). Outer coronal of the 

 peristome with fifteen to twenty divergent, pyramidal feet, half as long as the horn ; inner coronal 

 with as many longer, vertical feet, which are irregularly forked or branched. 



Dimensions. Length of the three joints, a 0'04, b 0'04, c 0'06 ; breadth, a 0'04, b 012, c 016. 



Habitat. South Pacific, Station 298, depth 2225 fathoms. 



Genus 608. Diplocyclas, 1 Haeckel, 1881, Prodromus, p. 434. 



Definition. T heophormida (vel Tricyrtida multiradiata aperta) with a double 

 corona of radial solid feet, an upper around the lumbar stricture, a lower around the 

 mouth. No ribs in the shell- wall. 



The genus Diplocyclas differs from all the other Theophormida in the possession of a 

 double coronal of radial teeth, an upper between thorax and abdomen, and a lower around 

 the terminal mouth of the latter; it may be regarded as an Anthocyrtis, which has 

 formed an abdomen, and repeated the terminal armature. The cephalis bears a single or 

 double apical horn. 



1. Diplocyclas bicorona, n. sp. (PL 59, fig. 8). 



Shell slender, campanulate. Length of the three joints =1:3:2, breadth = 1:4:4. Cephalis 



subspherical, with two divergent horns ; the occipital of the same length and forked, the frontal 



shorter and simple. Thorax campanulate, with six to eight transverse rows of double-edged 



roundish pores of increasing size. Abdomen cylindrical, with three transverse rows of large poly- 



1 Diplocyclas = Female robe with a double girdle ; 3<VXo'os, xt/xAj. 



