1890.] NATURAL SCIENCES OF PHILADELPHIA. 323 



There are twenty tentacles of" nearly equal size. 



The body-wall is moderately thick. 



The calcareous ring is well developed and is of the shape given 

 in PI. VIII, fig. 13. 



There is a bundle of five madreporic canals on the right side of 

 the dorsal mesentery and a single canal on the left side. The canals 

 are short and have an elongated head. 



A single, long and slender Polian vesicle is present, possessing a 

 vesicular enlargement at its distal end. 



A very small bundle of Cuverian organs exists. 



The sexual glands are divided. 



The color of the dorsal surface, in alcohol, is indigo-black relieved 

 by a number of large white spots arranged on either side along its 

 edge, and also forming irregular longitudinal rows upon the inter- 

 vening area. From the centres of these white spots arise the })apilhe 

 described above. The ventral surface is dirty white, speckled with 

 indigo. Each of the interambulacral areas of the ventral surface 

 is marked by a dark line. The pedicels and papillae have a yellow- 

 ish tint. The tentacles are of a dirty white color. 



Length 35 mm. 



A single specimen was collected among the wet sea-weed washed 

 up on the beach at the Port of Silam. 



It is closely allied to Holothuria atra of Jiiger, but is distinguished 

 by the presence of pedicels upon the dorsal surface, by the absence of 

 tables in the integument of the jjody-wall and by the well-defined 

 color pattern. 



Toxopneustes variegatus, Lamk. Auiiu. Sans. Ver., 1S16, p. 48. 



A. Agassiz, Mem. Mus. Corup. Zool., Vol. III. 1872-LS74, pp. ItiS, 289, 500. PI. II, 

 iva, vi, vii, xxv. 



Three specimens were dredged in shallow water on a sandy bottom 

 off Progreso and three specimens were collected on the beach. They 

 are evidently not very abundant in this locality. None were found 

 upon the beach at Silam. 



In the specimens obtained the spines are very short and those of 

 the al)actinal surface, rather slender and pointed. 



Prof. Alexander Agassiz in the Revision of the Echini mentions 

 the presence of two specimens of this species in the Museum of the 

 Ecole des Mines, from Yucatan. The species was also dredged on 

 the Yucatan Bank, bv the " Blake." 



