248 Mr. Tv. I. Pocock on soi7ie Types oj 



Two conclusions of prime imjiortance may be drawn from 

 the liypotliesis and the evidence here ])resented, Jianielj : — 



1. The scales of fishes bear a segmental relation to the 

 remaining hard and soft parts, and are either repeated con- 

 secutively and in oblique rows corresponding to the number 

 of segments, or they may be rej)eated in rows as multiples of 

 the somites, or segmental reduction may occur which may 

 affect the arrangement of the scales so as to reduce the number 

 of rows below the number of somites indicated by the other 

 soft and hard parts. 



2. The peculiar manner of interdigitation of the muscular 

 soniitcs, as indicated by the sigmoid outline of the myocom- 

 mata as seen from their outer faces, and the oblique direction 

 of the membranes separating the muscular cones, has developed 

 a mode of insertion of the myocommata upon the corium 

 which has thrown the integument into rhombic areolae during 

 muscular contraction. These areolae are in line in three 

 directions, and the folds separating them, particularly at their 

 posterior borders, are intlected in such a manner by muscular 

 tensions, due to the arrangement of muscular cones, as to 

 induce the condition of imbrication so characteristic of the 

 squamation of many fishes. 



XLIII. — Upon the Identity of some of the Types of Diplopoda 

 contained in the Collection of the British Museum^ together 

 with Descriptions oJ some new Species of Exotic lulidie. Jiy 

 R. I. Pocock. 



[Plate XVI.] 



Part I. — Notes upon some Types of Diplopoaa. 



Lysiopetalum Ilardwichii (Newport), Aun. Mag. Xat. Hist. xiii. 

 p. 2G7 (LS44), is based upon a specimen of L. fdtidissimum, 

 8avi, Upusc. Scient. Eologua, i. p. 334 (1817). There appears 

 to be no foundation for the supposition that this specimen came 

 from India. 



Lysiopetalum liichii (Gray), in Griffith's Animal Kingdom (Insects, 

 i.), pi. 135. fig. 4, and further characterized by Newport in 

 vol. xiii. of the Annals of Nat. Jlist., has been recharacterized 

 by Latzel as L. anceps (Myr. Ost.-Ung. Mon. ii. p. 2'62) and 

 very possibly as sicunmn by lierlesc (Acari, Myr. e Scorp. 

 Ital. pt. vi. no. 7, 1883). 



Lysiop€t(dnm rvyulomm and Uncatum of Newport, Ann. & Mag. Nat. 

 Hist. xiii. p. 2i)7, arc based upon two specimens specificall)' 

 identical with each other and with L. ladariiuu of 8ay ; iho 

 latttr name has the priority. 



/i/Zi»» «/v<'r, Leach, Tr. Linn. 8oo. xi. p. 378 (1815) = /. (df>ipes, 

 C. Koch, &c. ; Leach's name has t)ic priority. 



lulus punctdtiis, Leach, he. cit. p. 37!> (1815)= /. sHvarum, Meinert, 

 I'orath, &c. ; not ptiuctatus, Meinert, I'orath. 



