S ECHINODERMS OF THE CRAG. 



disposition throughout ; they arc sepai'ated from each other by elevated ridges, and here 

 and there a scattered granule. The mouth is much larger than the vent, and is obscurely 

 ten-notched. The genital disk is prominent and tumid, but not abruptly sided. The 

 flattened and i)romincnt portion of each genital plate is covered with slightly unequal 

 secondary tubercles or granules ; its inferior and declining margin, with the space about 

 the genital pore, is smooth. One of the genital plates bears obscure traces of the 

 madreporiform tubercle. The ocular plates are pentagonal, and slightly rugose. 



I have seen three specimens of this species, all of different sizes, from the Coralline 

 Crag of Ramsholt. It is contained in the collection of iMr. Searles Wood. The largest 

 example is j^ltha of an inch in breadth by jAhs in height. 



A single remarkable and exceptional specimen of a I'cmnecliinus, larger even than the 

 above, exhibits some striking differences, presenting the general shape of T. excavatus, with 

 most of the characters of T. melocactus, of which, for the present, I must regard it as a 

 variety. 



3. Temnechinus globosus. Plate I, fig. 3. 



This species, also from the Coralline Crag of Ramsholt, differs from the preceding in 

 being of a globular form, having much smaller and less conspicuous sutural pits, and 

 smaller, more numerous, and more equal tubercles. It approaches much more nearly to a 

 true Echinm. 



The test is very convex above, and the sides elevated and gradually rounded. The 

 intcrambulacral segments are, in breadth, centrally to the ambulacrals nearly as 3 to 2. 

 The sutural pits are shallow, confined, and placed well apart : those on the ambulacral 

 segments are much the smaller. They all become gradually obsolete on the lower half of 

 the test. Each plate, whether ambulacral or intcrambulacral, bears a small primary 

 tubercle, surrounded by minute secondaries and intermediate gramdes. There are twelve 

 l)riraaries in each intcrambulacral, and fifteen in each ambulacral vertical row. The 

 avenues of pores arc nearly straight, the ridges between the pairs of pores strongly 

 marked. The mouth exhibits very slight traces of notches. The genital j)latcs are wanting 

 in the two examples which I have examined. The larger specimen measures half an inch 

 in height by eight twelfths in breadth. 



4. Temnechintjs tcrbinatcs. Plate III, fig. 11. 



Temnopleurds, species of S. V. Wood, MS. in Morris, Cat. Brit. Foss., p. 60. 



The only example of a Temnec/iinm, from the Red Crag, is one from Sutton. It is 

 contained in the cabinet of Mr. Searles Wood, who long since called attention to its 

 existence. 



It is a worn specimen, much rubbed, but differs so markedly in several respects from 



