16 BULLETIN OF THE 
plates bears a few knobs. The plates themselves are, however, rarely so 
symmetrical; they mostly have more or fewer holes and knobs. 
The most characteristic feature of this animal is that each dorsal scale bears 
one or several slender flexible cylindrical appendages, which are supported 
by a peculiar calcareous skeleton, composed of small crowded perforated plates 
or cups. Unfortunately, the material is too scanty to allow any detailed ex- 
amination, or to decide whether these appendages have any communication with 
the water-vascular system. 
Habitat. Lat. 25° 35’ N., Lon. 84° 21’ W. (1877-78); depth 101 fathoms; 
one very defective specimen. 
Trochostoma Blakei, n. sp. 
Figure 8. 
The body is ovate, the anterior extremity truncated and the posterior suddenly 
tapering into a narrow tail or caudal portion. There are fifteen (7) tentacles. 
The anus is devoid of anal teeth (2). The color is whitish or grayish. The 
length of the body itself is about 68 mm., and that of the tail7 mm. The 
tail is doubtless longer when fully extended. The integument is thin, almost 
transparent, but rough from numerous close-lying tables, which have a peculiar 
shape. They consist of a small disk, which as a rule is pierced with three 
comparatively large holes and has a more or less marked trilobate rim. The 
disk supports a very long simple and slender column, which at the base 
appears as composed of three rods. The end of the column is usually divided 
into three obtuse slightly curved teeth, or it is slightly enlarged and sur- 
rounded by a circlet of small hooks directed downward. The disks of the 
tables rarely have more than three holes; but when that is the case, three of 
the holes are always larger. In the tail, the tables have an elongate fusiform 
disk, which has about four holes in the enlarged centre and carries a spire made 
up of three rods and terminating in several spines. No other deposits are to 
be observed. The species is neatly related to Marenzeller’s Trochostoma 
arcticum. 
Habitat. Grenada (1878-79); depth 955 fathoms; one specimen. 
Trochostoma antarcticum, THEEL. 
The specimens agree most fully with the Challenger specimens. The 
deposits consist only of tables, characterized by their long spire, which as a 
rule is composed of three parallel rods united by numerous transverse beams; 
the ends of the three rods are bipartite or tripartite. No true wine-colored 
deposits are visible, but several of the tables themselves have begun to change 
in color, so that they in some places present a yellowish brown aspect ; imme- 
diately in the neighborhood of these yellowish portions of the tables, some 
