1880.] 



PROF. F. J. BICLL ON THE TEMNOPLEUUIDiE. 



425 



line of the intcranibulacral arorc ; and though not so deep nor so wide 

 as in T. toreiimaticus, they extend almost to the base of the primary 

 tubercles ; on the other side of these tubercles there are narrower and 

 shidlower furrows ; and in the middle line of the anibulacral areae 

 there are deep sutural pits: all these depressions are much more 

 distinct above the ambitus than they are on the actinal surface,in 

 which point they offer a striking point of difference from T. reevesii. 

 The test is by no means thin ; all the ocular plates are excluded from 

 the anal area ; the outermost, not the innermost, of the three 

 tubercles on the interambuhicral plates is the smallest. 

 The following are the more important measurements : — 



Spine. 



10-5=' 



In other words T. granulosus differs from T. reevesii (i. e. T. rey- 

 naudi) in the facts that : — 



i. The abactinal area is not large ; and the anal area is much 



smaller. 

 ii. All the ocular plates are excluded from the anal area^. 

 iii. There are sutural furrows and deeper angular pits. 

 iv. The miliaries are much more numerously developed. 

 V. There is no specially large anal plate. 

 vi. The actinostome is a good deal smaller. 



These differences ai)pear to me to be sufficient to justify us in re- 

 garding Gray's Toreumatica granulosa as a distinct species; it is, 

 however, obviously enough a member of the genus Temnopleurus. 



The following is a table of the dimensions of T. reynaudi proper, 

 the T. reevesii of Gray. 



As in the case of the preceding species, we may here note some 



' Tba numbers in brackets are the percentage results. 

 * Greatest length measured. 



' Gray's type specimen has lost the abactinal plates ; but two specimens col- 

 lected by Cnpt. St. John in the Oorean seas are perfect. 



[5] 



