TROPICAL PACIFIC HOLOTHURIOIDEA. 135 



Peniagone bispiculata, 1 sp. nov. 



Length about 45 mm.; width, back of middle, about 30 mm. Body oval, 

 narrower in front, very flat in the preserved specimens but probably less so in 

 life. Tentacles ten, relatively large. Oral surface with 10-12 very large pedi- 

 cels surrounding it, beginning near mouth on each side; even in their con- 

 tracted condition these pedicels are several millimeters long and 2 mm. thick 

 at base. Dorsal crest thin, rather low, rounded, about 10 mm. wide by 5 mm. 

 high, placed close to anterior end of body. On right side, 12 mm. back of 

 crest, is a papilla 6 mm. long by 2 mm. thick, pressed down flat against body; 

 no corresponding papilla can be detected on the left side but it may have been 

 broken off, and as the whole body-surface is very much wrinkled and folded, 

 its point of attachment is no longer to be found. Color, gray (holotype) or 

 pinkish (paratypes). 



Calcareous particles not very distinctive except by size; they resemble 

 those of P. intermedia but are more slender and have more pointed tips to the 

 four inwardly curved arms; these arms are 100-120 n long; here and there among 

 these small and very numerous spicules are scattered abruptly larger ones with 

 arms 150-170 n long. 



Station 17. Eastern Tropical Pacific, 0° 50' N., 137° 54' W., 2,463 fms. Bott. temp.? Lt. yel.-gy. 

 glob. oz. 



Three specimens. 



While this new Peniagone resembles vitrea and intermedia in certain par- 

 ticulars, the arrangement of the large pedicels and the form of the body are very 

 different from what is found in either of those species. The size of the spicules 

 and particularly the existence of two very different sizes are also distinctive 

 points. It is at least worthy of note that while the holotype is fairly well pre- 

 served the paratypes are in very bad condition, each of them being split open 

 down the back for the entire length. The appearance suggests that with the 

 release from the bottom-pressure these specimens exploded leaving only the 

 empty skin, which had proved weakest along the middorsal line. 



Peniagone intermedia. 

 Ludwig, 1893. Bull. M. C. Z., 24, p. 109. 



The specimens referred to this species are in such poor condition, that 

 their identification is far from certain. They are supposed to belong to inter- 



1 bispiculata = having two kinds of spicules, in reference to the two distinct sizes in the calcareous 

 particles. 



