18 BULLETIN OF THE 



have each two pairs of minute branches or digits. The calcareous ring has 

 five bipartite prolongations. 



The very crowded deposits consist of irregularly formed tables, which devi- 

 ate from those described by Semper, etc. in having much larger disks and a 

 spire made up of only three rods, in consequence of which I propose to refer 

 the Blake specimens to a variety. In general, the disks of the tables are large, 

 smooth, of an irregular shape with uneven margin, and pierced with numerous 

 holes. They often have an irregular triangular or quadrangular form, with 

 twenty or more holes. The spire is composed of tliree irregularly spinous 

 rods, united by a few (two or three '?) transverse beams. So far as I can 

 understand from the descriptions hitherto made, the spire in the typical 

 specimens shoidd be composed of four rods. 



Habitat. Lat. 35° 44' 40" N., Lon. 74° 40' 20" W. (1880); depth 898 

 fathoms ; three specimens. Lat. 41° 24' 45" N., Lon. 65° 35' 30" W. (1880); 

 depth 1242 fathoms ; two specimens. 



Ankyroderma affine, Danielssen & Koren (van). 



In the specimen dredged at St. Vincent, a few light wine-colored bodies are 

 present. On the contrary, I have not been able to detect a single one of those 

 colorless bodies which have been figured and described by Danielssen and 

 Koren (compare Figs. 26 and 27 in their report), and I must confess that these 

 bodies appear to me to be nothing else than artificial products owing to preser- 

 vation in alcohol. 



Among the " tables " I have observed a few very scattered, minute perforated 

 plates supporting a very long spine, which carries at the top a crown of hooks, 

 like those found by me in Trochostoma antarcticum. The anchors always 

 have a discoidal, perforated base. Contrary to what is observed in Ankyro- 

 derma Jeffreijsii (var.), I never found the fusiform bodies except at the extrem- 

 ities of the body. 



Habitat. St. Vincent (18 78-79); depth 464 fathoms; one specimen, 35 

 mm. long. Dominica (1878-79) ; depth 391 fathoms; one specimen. 



Ankyroderma Jefireysii, Danielssen & Koren (var.). 



Some of the specimens have a marked violet color from more or less crowded 

 wine-colored bodies, while others are almost colorless and devoid of such 

 bodies. The anchors have a discoidal perforated base, just as I have found in 

 Ankyroderma Danielsseni, which possibly may prove to be only a variety of 

 Ankyroderma Jeffrey sii. 



Habitat. Lat. 41° 33' 15" N., Lon. 65° 51' 25" W. (1880); depth 810 

 fathoms; two specimens. Lat. 34° 39' 40" N., Lon. 75° 14' 40" W. (1880); 

 depth 603 fathoms; one specimen. Lat. 38° 20' 8" N., Lon. 73° 23' 20" W. 



