166 



white Cucumarias, the largest 24 mm long. This largest one is said to 

 have teen pinkish in life, with pink tentacles. Besides the double row 

 of pedicels on the ambulacra, these specimens all have scattered pe- 

 dicels on the interambulacra. The calcareous deposits consist of very 

 numerous, thick, knobbed, lenticular buttons, with about 12 perfora- 

 tions and most of them have one end drawn out as a spiny projection. 

 These deposits resemble those of C. leonina Semper, and consequently 

 I am inclined to think these 5 specimens from Pacific Grove represent 

 Brandt's species miniata, which according to Ludwig has deposits 

 like leonitia. But the presence of interambulacral pedicels makes me 

 doubtful. If these are miniata, and the large ones previously reported 

 is albicla Selenka, as seems probable, there Ludwig is wrong in suppo- 

 sing them to be identical. If these specimens are not miniata they 

 probably represent a new species, but the matter can only be settled 

 by a large series of specimens from Alaska and California. 



The 3 specimens of Thyone clearly represent a new species, to 

 which I have given the name rubra, on account of its color. Its cha- 

 racteristics follow: 



Thyone rubra nov. sp. Monterey Bay, California, near shore. 



Color in life, "reddish-pink on back, white beneath"; in alcohol, 

 rustyred on back, whitish beneath. Length 20 mm; diameter 5 mm. 

 Body almost cylindrical, uniformly covered with numerous pedicels; in 

 only one specimen and then only at the ends of the body could rows on 

 the ambulacra be distinguished. Pedicels provided with terminal plates. 

 Tentacles 10, the 2 ventral much smaller. Anal teeth wanting. Radial 

 pieces of calcareous ring with prominent posterior prolongations. Ge- 

 nital glands short, thick and un- 

 Fio- 2 1 



"' "' branched. Body wall more or less 



^^' ' stiffened by the very numerous 



calcareous particles. In the deepest 

 layer of the body wall these par- 

 ticles are symmetrical buttons with 

 , 4 holes and 2 knobs (Fig. 1) but 

 as the outside is approached the 

 number of knobs and holes increases (Fig. 2) greatly and the center of 

 the plate becomes elevated to form the broad, low spire of a very com- 

 plex and peculiar table (Fig. 3). The deposits in the dorsal surface 

 are very much larger than those in the ventral, and besides the depo- 

 sits just described we find a few very large knobbed and perforated 

 plates (Fig. 4). In the pedicels, the discs of the tables become elongated 

 and the spires reduced to form the supporting rods (Fig. 5). Themost 

 interesting fact about this Thyone is that it is viviparous, the embryos 



