96 PROF. p. M. DUlSrCATSI S -REVISION OF THE 



Genus Podocidaris, A. Agassiz, 1869, Bull. Mus. Gomp. Zool. ; 

 1872, Revision, p. 269 ; 1881, Report on ' Challenger ' I]cli. 

 p. 59 ; 1883, Report on ' BlaTce ' Ech. p. 22. 



Test moderate in size, pentangular or circular in tumid mar- 

 ginal outline, regularly arcHed but depressed abactinally, faintly- 

 tumid actinally around the large depressed peristome. 



Apical system with large basal and radial plates ; periproct 

 small, with four or five triangular plates ; anus at their inner 

 points. 



Ambulacra rising above the general level, broadest at the 

 ambitus, and about equalling the interradia at the peristome. 

 Primary tubercles plain, seen at the ambitus and actinally only, 

 the rest of the interporiferous area being furnished with short 

 sessile spines, with or without pits at their bases. Pairs of pores 

 in simple series. 



Interradia broad at the ambitus, and having the primary 

 tubercles at the ambitus and actinally, the rest of the surface 

 with sessile spines similar to those of the ambulacra. 



Peristome large, pentagonal, depressed, with branchial incisions. 

 Tentacles prehensile from the peristome to above the ambitus, 

 and pointed and branchial abactinally. Peristomial membrane 

 with buccal plates. Articulated spines restricted to the ambitus 

 and under surface of the test, short and fusiform, or long and 

 slender, striated, serrate, others without a socket and continuous 

 vath the test. 



Recent. Caribbean Sea, 150 to 590 fathoms, and Philippines, 

 1050 to 1075 fathoms. 



VII. Family TEMNOPLEURiDJi;. 



Regular, ectobranchiate gnathostomes, with the teeth keeled, 

 the pyramids of the jaws having epiphyses closing the foramen, 

 the external branchise tufted or dactylose ; the ambulacra with 

 triple compound plates and subhomoiopodous tentacles ; the 

 suture of the ambulacral and interradial plates and of the apical 

 system grooved and may be pitted, or there may be a raised 

 ornamentation, costulate or reticulate or in ridges, the sutures 

 being furrowed or not. Plates united by dowelling. 



Subfamily G lyp hocyphince. 

 Tumid tests with a large apical system, the basals low, and 



