1116 THE VOYAGE OF H.M.S. CHALLENGER. 



anterior sternal from the nasal lobe. Two paired lateral tubes arise from the base of two ovate 

 frontal lobes. The five tubes correspond in disposition to the five spines of Stcphanium. Thorax 

 truncate. Pores small. 



Dimensions. — Length of the shell 012, breadth 0-09. 



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



Genus 490. Botryocella,^ Haeckel, 1881, Prodromus, p. 440. 



Definition. — L ithobotryida without tubes on the cephalis, and with the mouth 

 of the thorax closed. 



The genus Botryocella differs from the closely allied Botryopyle in having the mouth 

 of the thorax closed, and may be derived from it by development of a lattice-plate, 

 effecting this closure. It bears therefore the same relation to the latter that Dicolocapsa 

 has to Dictyocephalus. 



1. Botryocella nucula, Haeckel. 



Lithohotrys nucula, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 76, Taf. iii. 



fig. 16. 

 Ldthobotrys adspersa, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 76, Taf. iii. 



fig. 15. 



Cephalis trilobate ; occipital lobe helmet-shaped, nearly twice as long as the two ovate frontal 

 lobes. Thorax about as long as the cephalis. Pores very small and scarce. 

 Dimensions. — Length of the shell 0-06, breadth 0'03. 

 Habitat. — Fossil in Barbados. 



2. Botryocella borealis, Haeckel. 



Ldthobotrys borealis, Ehrenberg, 1872, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 294, Taf. ii. 

 fig. 3. 



Cephalis trilobate ; occipital lobe ovate, little longer than the two ovate frontal lobes. Thorax 

 about twice as long as the cephalis. Pores very numerous and small. 

 Dimensions. — Length of the shell 0'08, breadth 0'04. 

 Habitat. — North Atlantic, Greenland, depth 1000 to 2000 fathoms. 



3. Botryocella tricellaris, n. sp. 



Cephalis trilobate, with three odd sagittal lobes ; the middle or central lobe larger than the 

 anterior frontal and smaller than the posterior occipital lobe. Thorax nearly spherical, about as 

 long as the cephalis. Pores small and scarce. 



DimensioTis. — Length of the shell 0'08, breadth O'OG. 



Habitant. — North Atlantic, Station 353, depth 2965 fathoms. 



' Botryocella =GTape-^umace ; /SoV^vf, KtKka.. 



