1480 THE VOYAGE OF H.M.S. CHALLENGER. 



Pores of the upper half smaller, quincuncially disposed. Cephalis with a stout pyramidal horn of 

 the same length. Dedicated to Carl Ernst Baer (Konigsberg, 1828). 



Dimensions. — Length of the shell (with six joints) 0'2 ; breadth of the third joint 0'09, of the 

 fourth 0-07. 



Habitat. — North Pacific, Station 244, depth 2900 fathoms. 



4. Stichocorys okenii, n. sj^. (PI. 80, fig. 5). 



Shell smooth, without spines or ribs; the upper conical half (with three joints) about the 

 same length as the lower subcylindrical half (with three joints). Pores subregular, circular, in the 

 inflated third joint twice as large as in the five other joints. At the lumbar stricture (between 

 the second and third joints) a coronal of nine very large pores. Cephalis with a curved horn of half 

 the length. Dedicated to Lorenz Oken (Jena, 1806). 



Dimensions. — Length of the shell (with six joints) 0'2; breadth of the third joint 009, of the 

 fourth 0-07. 



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



5. Stichocorys huschkei, n. sp. (PI. 80, fig. 3). 



Shell in the upper conical half (with three joints) thorny, in the lower cylindrical half (with 

 five joints) smooth, roundish. Pores irregularly scattered, always double-contoured, in the second 

 joint three times as large as in the third. At the third stricture (between the third and fourth 

 joints) a coronal of larger pores. Cephalis with a small, conical horn of half the length. No 

 longitudinal ribs. Dedicated to Emil Buschke (Jena, 1832). 



Dimensions. — Length of the shell (with eight joints) 018 ; breadth of the third joint 0'08, of the 

 fourth joint 0-07. 



Habitat. — South Pacific, Station 285, depth 2375 fathoms. 



6. Stichocorys rathkei, n. sp. 



Shell spiny, everywhere covered with short conical spines. The upper conical part of the 

 shell (with three joints) half as long as the lower cylindrical part (with six joints). Pores 

 irregular, roundish, in the thorax twice to three times as large as in the eight other joints. Cei:ihalis 

 with a pyramidal horn of the same length. No longitudinal ribs. Dedicated to Heinrich 

 Rathke (Konigsberg, 1839). 



Dimensions. — Length of the shell (with nine joints) 0'24 ; breadth of the third joint 008, of the 

 fourth joint 0'06. 



Habitat. — North Pacific, Station 253, depth 3125 fathoms. 



7. Stichocorys miilleri, ii, sp. 



Shell in the upper conical part (with three joints) spiny, in the lower cylindrical part (with 

 seven joints) smooth. Pores in the former irregularly scattered, roundish, in the latter circular. 



