1110 THE 70YAGE OF H.M.S. CHALLENGER. 



Perhaps these five groups may be separated as five genera, possessing near relations to 

 five very different genera of Nassellaria (Circosjjyris, Halicapsa, Archibursa, Cortina, 

 StejihaJiium, &c. 



1. Cannobotrys Tnonocanna, n. sp. 



■ Cephalis trilobate, with a single cylindrical straight ajDical tube on the apex of the occipital 

 lobe, which is helmet-shaped, and about one and a half times as long as the two subspherical 

 frontal lobes. Pores small and numerous, subregular, circular. 



Biviensions. — Length of the shell 0'05, breadth 003. 



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



2. Cannobotrys dicanna, n. sp. 



Cephalis quadrUobate, with two divergent tubes, an odd apical tube on the apex of the posterior 

 occipital lobe, and an odd sternal tube on the anterior frontal lobe. Between these two odd lobes 

 lie two paired lateral or buccal lobes, of about the same size. Shell nearly hyaline, with very 

 few minute pores. 



Dimensions. — Length of the shell 0'06, breadth 0'04. 



Habitat. — Indian Ocean ; Madagascar (Eabbe), surface. 



3. Cannobotrys tricanna, n. sp. (PL 96, fig. 3). 



Cephalis quinquelobate, with three curved cylindrical tubes in the sagittal plane ; an ascending 

 apical tube on the apex of the helmet-shaped occipital lobe, and two horizontal tubes on the base of 

 the shell (a posterior caudal, c, and an anterior sternal, z). The two frontal lobes are hemispherical, 

 and twice as large as the two lateral buccal lobes. Pores very small and numerous. 



Dimensions. — Length of the shell 0'08, basal breadth O^OG. 



Habitat. — Central Pacific, Station 265, depth 2900 fathoms. 



4. Cannobotrys sagittalis, n. sp. 



Cephalis multilobate, with three straight divergent cylindrical tubes in the sagittal plane ; a 

 vertical apical tube on the apex of the ovate occipital lobe, and two horizontal tubes on the base, as 

 in the preceding similar species ; it differs from the latter in the greater number of lobes (seven or 

 nine), the two frontal lobes being divided into two or four secondary lobules. 



Dimensions. — Length of the shell 01, breadth 0-07. 



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



5. Cannobotrys cortina, n. sp. (PL 96, fig. 4). 



Cephalis quinquelobate, with four cylindrical nearly straight tubes of equal size ; an ascending, 

 nearly vertical, apical tube on the apex of the occipital lobe, and three divergent descending tubes 



