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Show 424 PROF. F. J. DELL ON THE TEMNOPLEURIDAE. [June 1, 1. TEMNOPLEURUS TOREUMATICUS. Percentage value of Height. 61-1 551 50 50-9 45-45 40-4 Abactinal area 33-3 ? 22-2 21-9 18-6 191 Anal area. 15-5 13-8 11-1 9-9 9 8*5 Actinostome. 44-4 31 29-6 29*9 28-6 28-7 This species is so well known that there is no need to delay over it. 2. TEMNOPLEURUS HARDWICKII. iii iv vi Absolute diameter in millims. 7 11 24 27-25 32 43 Percentage value of Height. 5714 63-63 50 47-7 56-2 60-4 Abactinal area. 30 29 2208 21-8 21-8 2093 Anal area. 14-28 136 9-6 917 9 37 902 Actinostome. 42-8 45-5 33-3 29-1 29 06 26-7 With regard to the height, it would seem that it is not so much that changes occur in it during growth, as that there are considerable variations in it, with a tendency to a high form (63 per cent.) and a low form (47*7 per cent.), 3. TEMNOPLEURUS REYNAUDI. As I have already pointed out, I believe that in the latest Revision two distinct species have been united under this head. Mr. Percy Sladen has given expression to a doubt on the subject1; and he informs me that the type of Dr. Gray's T. granulosus struck him as being " a good species " when, some time ago, he had the opportunity of examining it. T. reevesii of Gray does, however, seem to be synonymous with the T. reynaudi of Agassiz. When the types of the two species are compared, we find that in T. granulosus the abactinal area is of moderate size and there is no specially large plate in the anal area; the connecting ridge of the auricles2 is lower than in T. reevesii; the miliary tubercles are very numerously developed and surround the primary tubercles; sutural furrows, quite distinct from the pits of T. reevesii, occupy the middle 1 J. L. S. xiv. p. 437. - I feel inclined to attach a little more importance to this character then does Prof. Agassiz, w h o says of it that it is high, when he is defining the genus, and very low, when defining T. hardwickii (p. 461). ii iii iv v vi Absolute diameter in milims. 9 14.5 27 27-5 44 47 |