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. 



Fignire 8. 



The body is ovate, the anterior extremity truncated and the posterior suddenly 

 tapering into a narrow tail or caudal portion. There are fifteen (?) tentacles. 

 The anus is devoid of anal teeth (?). The color is whitish or grayish. The 

 length of the body itself is about 68 mm., and that of the tail 7 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 cari'ies a spire made 

 up of three rods and terminating in several spines. No other deposits are to 

 be observed. The species is ^lo.^rly related to Marenzeller's Trochostoma 

 ardicum. 



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 tl^ese yellowish portions of the tables, some 



