640 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 54. 



Up to the seventh fork each brachial segment carries a very con- 

 spicuous transverse band, consisting of a single regular line of usually 

 about 25 low closely appressed tubercles, each one of which bears a 

 conical articulated tooth similar to those on the cross bands of the 

 ribs, which may be slightly compressed in its outer portion, with a 

 chisel-shaped tip. 



Beyond the seventh fork, instead of these transverse bands of articu- 

 lated teeth, the segments each bear a prominent and regular double 

 row of tubercles carrying rather slender strongly curved hooks with- 

 out supplementary prongs, resembling those of Astrocyclus caecilia. 



Color (dry) yellowish brown, ventrally lighter and more grayish, 

 the transverse bands of tubercles on the arms and disk, the groups of 

 enlarged granules on the latter, and the terminal shields of the radial 

 ribs, yellowish white. 



Locality. — Yucatan. 



EXPLANATION OF PLATE 96. 

 Abactinal (dorsal) view of Astrocynodus herrerai, X 2. 



