GENEBA AND GROUPS OF THE ECHINOIDEA. 177 



anywhere between the apical system and the posterior margin of 

 the test. 



These remarks dispose of the five genera or subgenera sug- 

 gested by M. Pomel; M. Cotteau (op. cit. p. 336) writes that the 

 characters depended upon for their separation are of specific 

 value only. 



We shall have to recur to this decision, in whicli we fully 

 concur, further on in noticing the forms referred to Hemiaster. 



It is certain that the typical species of UcJiinohrissus, as well 

 as the recent forms, have no true floscelle, and this condition is 

 exemplified in ^. Meslei, Peron & Grauthier, from Algiers. But 

 MM. Cotteau, Peron & Gauthier, and also M. Coquand, admit 

 species iuto the genus which have bourrelets and phyllodes, such 

 as ^. Julieni, E. incegiuiflos, E. sitifensis, and others which are 

 described in ' Ech. foss. de I'Algerie,' fasc. 7 & 8. These have 

 well-developed phyllodes and all the characters of Oassidulus, 

 except the unimportant aqtinal median bare band (see Oassi- 

 dulus). 



Grenus Anochanus, Gruhe, 1869, Monatsl. d. Jc. preuss. Akad. 

 d. Wiss. zu Berlin (1868), p. 178. 



Test small, re^^emhWng NucleoUtes epigoiius, Martens *, in shape, 

 and in the position of the peristome and periproct ; having no 

 visible madreporite or basal plates ; the dorsum occupied by a 

 marsupium which does not lead into the cavity within the test, 

 but which is surrounded by a raised rim of calcareous tissue, 

 liaed with soft parts which bend in from the outer derm, and are 

 covered with pedicellariae and protected at the narrow external 

 opening by spines ; larger pedicellarise on the outside of the test. 

 The perfect young are found within the marsupium with spines 

 on them. 



Recent. Probably China. 



Grenus Boteioptgus, d'Orhigny, 1855, Pal. Frang., Ech. terr. 

 Gret. p. 334. Desor, 1858, Synopsis, p. 278, pi. xxxi. JDe 

 Loriol, 1873, Pal. Suisse, Terr. Cret. pi. xvi. fig. 3 ; 1884, Bee. 

 Zool. Suisse, i. p. 615. 



Test small and moderate, elongate ovoid at the narrow, tumid, 

 somewhat undulating margin, broader behind than anteriorly, 



* OUgopodia epigonus, Martens, sp. 



LINN. JOTJEN. — ZOOLOGY, YOL. XXIII. 12 



