MUSEUM OF COMPARATIVE ZOOLOGY. 357 



the axial pentagonal depressed in the middle into a shallow pit marked 

 with a hlack spot. A similar pit on several of the brachials, which are 

 long with imbricated and serrated edges. Buccal membrane filled with 

 calcareous concretions. First pinnule much longer than the succeeding 

 ones. All the pinnules are very slender, with fine spines on every joint, 

 forming also a verticil at their distal end. The spines are directed for- 

 wards near the beginning of the pinnule, but gradually curve back, and 

 the last joint terminates with several hooked claws ; color rusty red, with 

 a black dorsal stripe on every arm and black ambulacral furrow. 



One small specimen was dredged in 9 fathoms off Orange Key, Ba- 

 hama Bank, and several arms of a large specimen near the Tortugas in 

 17 fathoms. 



Antedon brevipinna Pourt. ( Comatula brevipinna Pourt., Bull. 

 Mus. Comp. Zobl. No. G.) "Was not obtained again since the first speci- 

 men was dredged in 1867. 



Still another species was noticed, but the specimen was too mutilated 

 for description. 



Pentacrinus Miilleri Oersted. Joints of the stem of a Penta- 

 crinus were dredged up off Havana in 270 fathoms, and again in 3 If) 

 and 471 fathoms off Double-headed Shot Keys. No trace of it was 

 found on the Florida side of the Gulf Stream. 



A few of the joints, showing the mark of the attachment of cirrhi, and 

 being double, show that they belong to this species, and not to P. asteria 

 Linn., in which the cirrhiferous joints are single. 



Rhizocrinus lofotensis Sars. (Bourgueticrinw Hotessieri 

 d' Orb., Pourt. in Bull. Mus. Comp. Zool. No. 7.) This crinoid has been 

 obtained again several times during the season's work of I860 ; always 

 in the foraminiferous bottom of the trough of the straits, in depths vary- 

 ing from 237 to 450 fathoms. An interesting addition to our knowledge 

 of its geographical distribution is its occurrence on the " Josephine Bank," 

 a new discovery of the Swedish Frigate Josephine between the coast 

 of Portugal and the Azores. 



During the stay of that ship in Boston Harbor, Dr. Smitt had the 

 kindness to show me his dredging collections, among which I saw this 

 species, also Echinocncumis typica, Pteraster militaris, and perhaps a few 

 others, representatives of the Gulf Stream deep-sea fauna, which we 

 know to occur also on the coast of Norway. 



Cambridge, November, 18C9. 



