690 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxn. 



some, but whether the}^ are confined wholly to this region it is impos- 

 sible to say on account of the condition of available specimens. Tables 

 of the dorsal perisome are of the type shown in fig. la, Plate LXXII. 

 The disk is a four-armed cross, with the tips of the arms slightly 

 expanded and one to five times perforated. The spire rods are toothed 

 on the upper half, the spire itself being about 0.12 to 0.15 mm. high, 

 with five crossbeams. Rarely the teeth are absent. At the bases of 

 the large dorsal papilla^ and to a less extent of the laterals also, are 

 relatively very large tables with four-armed disks and robust spiny 

 irregular spires. (Plate LXXII, fig. 1<", e, g.) The disks are from 0.3 

 to 0.47 mm. in diameter, and the ends of the arms are much expanded 

 and perforated. The general form of the tables is sufficiently indi- 

 cated by the figures. The spire of this table is 0.2 mm. high, but 

 there is considerable range on both sides of the dimension. The tables 

 in the papillte proper are more of the type of those of ventral peri- 

 some, although much exaggerated in height (fig. If). They are usually 

 numerous and grade into the tj^pe of a and e at base of papilla. The 

 spire is usually about 0.17 to 0.2 mm. high. Scattered among these 

 tables are relatively few supporting rods with spiny tips (1^', lA) about 

 0.5 mm. long. So far as examined the pedicels have scattered tables 

 similar to fig. Id, but w^ith only one or tw^o crossbeams. Frequently 

 two or three supporting rods are present near terminal plate, though 

 they may be entireh^ absent. The terminal plate is large, circular, 

 and perforated. 



This species is characterized by the distribution of the ambulacral 

 appendages, by the presence of a narrow but easily detected margin 

 or brim to body, b}" the form of the tables, and by the form of the cal- 

 careous ring. It differs from all known species by the form of the 

 calcareous deposits. Sluiter (Siboga Holothurioidea) has described 

 B. sulcatus, B. ruhlcundus, B. nionoclus, and B. phlegmaticus from 

 the East Indian region. The present species is apparently nearer 

 phlegmaticus than an}^ of the others, but differs in all the categories of 

 characters mentioned above, besides having 20 tentacles while phleg- 

 maticus has 15. Koehler and Vaney have described from the Investi- 

 gator collections, B. iJTofundus, B. crenulatus, B. assimilis, B. varia- 

 hilis, and B. jmpilloms. The deposits of all of these are different 

 from those oi patagiatus. 



Patagiatus is more or less closely related to B. natans (Sars) which 

 it resembles in the marginal papillte and brim, but differs in numerous 

 details of deposits, etc. (for figures of natans, see Ostergren)." 



«Zur Kenntniss der Subfamilie Synallactiiiiie unter den Aspidochiroten. 



