322 Verrill, JSTotes on Radiata. 



interambulacra. In the same manner Oucumaria may be restricted to 

 the group having C. frondosa as its type. In these the form is more 

 swollen and rounded ; the suckers wholly retractile, in five zones ; 

 the interambulacral zones provided with few scattered papillae. 



AnaperUS PeruanUS Troschel, "Wieg. Arch, xii, p. 61, 1846.* 

 HoMhuria peruviana Lesson, Cent. ZooL, pi. 46, p. 124. 

 Thyone peruana Selenka, Zeitschrift fiir "Wissenschaft. Zoologie, 1867, p. 354. 



Several large examples of this species were obtained by Mr. Brad- 

 ley both at Paita and Callao, Peru. 



This species may be i*egarded as the type of the genus Anaperus 

 of Troschel, it being the first species mentioned by him. It is allied 

 to A. Briareus [A. Carolina Tr.) from the Carolina coast, Long Isl. 

 Sound, etc. 



Lissothuria Verrill. gen. nov. 



Allied to Psolus, but having the upper surface of the body covered 

 with a soft, smooth skin in which are imbedded minute perforated 

 plates. Lower surface flat, with three broad rows of crowded suckers. 

 Anal area elevated, the opening surrounded by calcareous papillre. 

 Tentacles ten, arborescently branched, the two lower ones smallest. 



Lissothuria ornata Verriii, sp. nov. 



Body elongated, depressed, the flat lower surface bi-oad ; the ante- 

 rior end elevated ; the anal area near the high posterior end, little 

 elevated above the surface of the back. Length 2-1 ; breadth -85 ; 

 height -35 ; length of lower surface 1-7 ; breadth -85. 



The anterior end, bearing the tentacles, rises considerably above 

 the level of the back, and where it joins the naked part below the 

 tentacles there is a ring of calcareous plates, with pointed ends, and 

 on the upper side four, elongated, flexible papilhe rising from enlarged 

 bases having calcareous grains, apparently corresponding to four of 

 the ambulacra. The tentacles are arborescently branched, not large, 

 the subdivisions in contraction forming a rounded cluster, on a stout 

 pedunculated base. Anal region conical, opening posteriorly. Suck- 

 ers of the lower surface small and very numerous, crowded, six or 

 eight series in each ambulacrum. The skin above is soft, but filled 

 with minute calcareous grains and fewer, somewhat larger, perforated 

 ones. 



Color, in alcohol, light purple, whitish beneath, disk purple, with a 

 yellowish white ring around the mouth ; tentacles purple at base, the 

 subdivisions yellowish. 



Panama, one specimen, — F. H. Bradley. 



* This belongs to the genus Pattalus (see page 376), — Reprint. 



