_V, .IOIIAN Kl.KII. [SEC. ARCT. EXP. FRAM 



-ciilptmv ami interior structure from the I^n in in < >.<!'' us remains previously 

 de-crihed. In certain respect- they are nearer to the well-known /^v/un/^.vy/.s 

 GeH/iiml<'Hi'Hxin of THAOI AIH'S description, hnl they cannot he combined 

 with that form. I will return to Ibis matter subsequently, and simply 

 -late here in what manner the specimen- described may be orientated. 

 I make the \ery probable assumption that Drepanaspis is a closely 

 related form. Ihat provides us willi a representation of the habits of the 

 body in the case of Pxmnninstcnx 



The -penmen described in 1 must therefore be assumed to be a 

 Iragment id' one of the large central body plate>. either dorsal or 

 ventral. 



The fragment described in -2 probably belonged to one of the lateral 

 plates, as the denticles on these in the ca-e of Drepanaspis are ii.-ualiy 

 extended. 



The little plate described in 5 shows signs of correspondance to the 

 -mall, intermediary plates in Drepanaspis. 



The fragment described in 4 is more difficult to determine. It is 

 evidently portion of an element with an oblique, spine-shaped construc- 

 tion, corresponding to those known from the Livland PsammosteMS farm. 

 It might be regarded as either a dorsal spine or a lateral spine, lor the 

 posterior corners of the lateral Maps in these forms possibly emerged in 

 -harp spines or horns, instead of being bluntly pointed as in the ca-e 



of Drepanaspis. 



Mori/ on. All the remains in our possession of this form come 

 from the li-h lion/on in Skrap Valley. 



s complicatus new species, 

 ll'l. II. fig. 8; PI. V. ligs 1-3; PI. VI. ligs 1-3). 



A number of 1'xnnnnoxfruN fragments in my material prove to be 

 -o different from the above and other forms described, both a- regard- 

 the interior and the exterior character, that they must be regarded as 

 a n--\\ -pecies to which I have given the name GOmplicatuS. 



The following peculiarities appear to be most characteristic; 



I. The denticles \ary greatly both in si/.e and in form. < m certain 

 plate- pre-umahK the large body plates. they are large, round, and 

 iv^ular. with central top and distinct ribs; in others. presumably 

 portions of the corner plates Icornua! they are small. Hal. oval, or 

 rhombic, -omel hue- -rralK extended and faintly ribbed. 



