110 PEOP. P. M. DUisrcAisr's bevisiois' or the 



zones largest and most numerous actinally, two rows reach tlie 

 apex ; secondary tubercles and granules exist ; scrobicules small, 

 raised or not. 



Interradia mucli broader than the ambulacra, with numerous 

 vertical rows of primaries, resembling those of the ambulacra, 

 diminishing in number and size abactinally and allowing a broad 

 median space to exist ; secondaries and miliaries exist. 



Plates of both areas with their lines of suture narrowly grooved, 

 with small but well-defined, oblique, deep pits at the angles of 

 junction of all plates, and along the ambulacro-interradial vertical 

 sutures. Sutural edges of plates well dowelled. 



Peristome small, subdecagoual, branchial incisions small. Bran- 

 chiae moderately large, with a stout base and bunches of finger- 

 shaped processes. Perignathic girdle with well-developed ridges 

 and tall processes, expanding above, united, and with a variably 

 sized foramen. Porameu of the pyramids with a closed arch ; 

 teeth keeled. Peristomial membrane rugose near the teeth, plain 

 elsewhere ; ten buccal plates with large tentacles and small stalked 

 pedicellarise. 



Tentacles subhomoiopodous, for the abactinal are very wide 

 and long, feeble in muscular structure, yet thesucker-riug exists 

 and is small ; actinal and ambital tentacles disciferous. Spines 

 short, delicate, striated, some sharp, others flat-ended. 



Fossil. Eocene -. Europe. Pliocene, Mekran Series : Persian Grulf. 



Recent. Ped Sea, Indian Ocean, Persian Grulf, Mergui, Philip- 

 pines, Japan, Siam, Australian seas, E. coast of Africa. 



Subgenus Salmacopsis, Doderlein, 1885 (genus), ArcJiiv fur 

 Naturg. Wiegm. Berlin, Heft i. p. 93. 



Test much broader than high, circular in ambital outline. 

 Coronal plates high ; tubercles few, small and smooth. Abacti- 

 nally the plates near the median line are smooth. Pits sharp and 

 angular, in the median line. Pores simple. Spines as in Salmacis. 



Recent. Sigarabai, Japan, 100-150 fathoms. 



This is evidently a subgenus of Salmacis. 



Grenus Mespilia, Desor, 1846, Agass. Sf Desor, Cat. JRais., Ann. 

 Sci. Nat. p. 357 ; Synopsis, 1858, p. 110. A. Agassiz, 1872-74, 

 Revision, p. 477. J. Bell, 1880, Proc. Zool. Soc. p. 434. 

 Duncan, 1888, Ann. ^ Mag. Nat. Sist. ser. 6, vol. i. pi. xi. 

 fig. 5, p. 113. 

 Test moderate in size, thin, more or less globular or oblately 



