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Show 426 PROF. F. J. BELL ON THE TEMNOPLEURIDAE. [June 1, considerable variation in the height of the specimens; the actinostome does not diminish so much in size during growth as it does in T. toreumaticus or T. hardwickii. II. MlCROCYPHUS. The specimens of this genus alter in appearance very greatly . during growth, as may be gathered from the fact that Prof. A. Agassiz formed a new genus Anthechinus (roseus sp.).for some rather young examples of M. maculatus; and matters are, unfortunatel}*, a Uttle complicated by the fact that the young of M. zigzag (as determined by Prof. Alex. Agassiz) have externally a most remarkable resemblance to the young of M. maculatus (Anthechinus roseus). The information which can be given regarding these two species is somewhat meagre; the most interesting point is, perhaps, the slight extent to which the actinostome of 31. zigzag diminishes in proportional size during growth. 1. MlCROCYPHUS MACULATUS. i iii iv Absolute diameter in millims. 23 27 37 45 Percentage value of Height. 73-8 70 3 621 62-6 Abactinal area. 26 263 21-6 20 Anal area. ii:i Actinostome. 44-7 40-7 36-5 33-3 2. M . ZIGZAG. i ii iv v Absolute diameter in millims. 8 8-2 15-5 23 25 Height. 77-4 84-7 84 Percentage value of Abactinal area. 32-2 23-9 24 Anal area. 129 8-7 Actinostome. 31-2 32-9 25-8 30-4 28-8 III. SALMACIS. Of all the genera of the Temnopleuridae, this is perhaps the most difficult; the determination of its species has more than once engaged m y attention, and has been more than once put aside in despair. Now, however, I have the advantage of having at hand the preliminary set of specimens collected by the officers of H.M.S. ' Challenger' and named by no less an authority than Prof. Alex. Agassiz. Some of these are exceedingly interesting as being very young specimens. Now, too, I have at hand the three interesting |