NO. 3 DEICHMANN : HOLOTHURIOIDEA ; PART I, DENDROCHIROTA 97 



plates, and the same type of spicules as in the integument. Particularly 

 numerous in the appendages, although also scattered in the skin are some 

 peculiar oblong heavy plates with small holes and one end drawn out 

 into a shorter or longer spine which pierces the skin (visible with low 

 magnification). Introvert with rosettes, tentacles with large curved per- 

 forated plates and rods, also rosettes, and in the finer branches, delicate 

 rods with perforated ends. 



Ty/.^.— Holotype, AHF no. 27. 



Type locality. — Port Utria, Colombia, close to shore, north of point 

 and west of islands, 20 fms., January 25, 1935. 



Distribution. — From Port Utria, Colombia, to Tenacatita Bay, Mex. 



Depth. — From 20-35 fms. 



Specimens examined. — The type and 3 other specimens from the fol- 

 lowing Velero stations: 

 259-34. Tangola Tangola, Mex., 15-20 fms., February 28, 1934, 1 



paratype. 

 275-34. Tenacatita Bay, Mex., of? Navidad Head, 25-35 fms., 2 speci- 

 mens. 

 423-35. Port Utria, Colombia, close to shore, 20 fms., 1 specimen, type. 



Kemarks. — The type measures about 4 cm. in length ; the other indi- 

 viduals are smaller. The color in alcohol is dirty yellow with large ir- 

 regular brown patches. The gonads are ripe and filled with eggs. (Speci- 

 mens collected in January.) 



The species seems fairly closely related to the type species, L. grisea 

 H. L. Clark, from Broome, West Australia (plate 14, figures 1-5). It 

 differs chiefly in the presence of the peculiar, spine-bearing plates, the 

 strongly knobbed buttons, and the much smaller and more simple baskets. 



3. Leptopentacta nina, new species 

 Plate 15, Figs. 1-12 



Diagnosis. — Small form (?), type measures 1.2 cm. with the tenta- 

 cles contracted. Body curved, slender; skin rigid; feet cylindrical, re- 

 tractile, restricted to the ambulacra (the type has about 25 tube feet in 

 the ventral rows and considerably fewer in the dorsal). Calcareous ring 

 with distinct posterior tails on the radials and long teeth, deeply grooved 

 on radials and interradials (resembles that of Sluiter's species, see text 

 figure 2). 



