138 



ECHINOIDEA. I. 



which are quite hidden in the skin. Tlie spicnles bihamate, branched or unbranched. The test more 

 or less flattened. The spines very different, from short and fine to long and coarse ones. 



Species: Str. chlorocentrotus Brandt, pulchcrrii)iiis (Barn.), iiitermedms (Barn.), drnhachioisis 

 (O. F. ^liill.), picrpurafits Stimps., franciscanus (Ag.). 



Distribution: The Northern Atlantic, the Arctic Ocean [drobachioisis]^ the Northern Pacific 

 Ocean (all the species). Littoral forms. 



Anthocidaris Liitken (emend.). 



Pores mnltigeminate; the pore areas somewhat petaloid on the actinal side. Primary tubercle 

 on all the ambnlacral areas. The bnccal membrane with numerous fine fenestrated piates most of 

 which are qnite hidden in the skin. The spicnles in the tnbe feet biacerate, a little cnrved, with a 

 rather strong point in the middle of the convex side. The test somewhat flattened, the spines rather 

 long and strong. 



Only one species known: A. lioinalostoina Ltk. 



Distribution: Japan, China. Littoral form. 



Subfam. Parasaleninæ n. subfam. 



The spicnles of the globiferous pedicellariæ bihamate, nnbranched; those in the tnbe feet bia- 

 cerate with a coiiple of small processes on the concave side. The globiferons pedicellariæ without 

 neck; the stalk compact. Slits of the test small"). 



Only one genns known: Parasaloiia. 



Parasalenia Ag. 



Pores trigeminate; primary tubercle on all the ambnlacral piates. The buccal membrane with 

 numerous fine fenestrated piates; no spines on the buccal piates. The periproct covered by four large 

 piates. The test oblong. The spines long and strong. 



Species: P. gratiosa Ag., Pohlii Pfeffer. 



Distribution: The Indo- Pacific Ocean. Littoral forms. 



. Fam. Echinometridæ Gray (emend.)'*. 



The globiferous pedicellariæ with end-tooth and one unpaired, strong lateral tooth; the edges 

 of the blade almost always connected b}- cross-beams across the inside; no neck. Only bihamate 

 spicnles are found. Slits of the test small. Tlie stalk of the jDedicellariæ compact. 



Genera: Pseudechinus, Heliocidaris, Echtnostrepliiis, Toxocidaris^ Echhionictra^ Colobocciifrofns^ 

 Heterocen trotits. 



Pseudechinus n. g. 



Pores trigeminate; primary tubercle on all the ambnlacral piates. The buccal membrane quite 

 naked with the exception of the buccal piates. The spines of a middle length, slender. The form 

 of the test regular, Echi7tusA}C^^. 



1) Payasalenia Polilii not examined. 



2) The uame of Echinotnetradæ is linguistically incorrect (Bell). 



