ON THE F08SIL mYLLOl'ODA OF THE I'AL.EOZOIC ROCKS. 



81 



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1. Sp. Einemnnii, Clarke, 18S2. Op. n't, p. 477, pi. 0. fipf. 1. 



This is elliptifal-oblojig', or elegantly oblonjr with rounded cndfl one 

 of which is parted by a narrow clel't. Length 42 mm. ; width 27 mm. by 

 the figures. 



1a. ^7'- J^iiiersoni i (r), lac. ctf. f. 2. 



This is referred to as heing a young form of the foregoing, but it is 

 obovato ' (not oblong), and may be specitically di.stinet. Length 12 mm. ; 

 width 8 mm. 



111. Sp. Emersonii {?), loc. rlt. f. o. 



This shows an elliptico-triangular shape, which may bo duo to ira- 

 bedmcnt in the matri.x, and resembles a lateral portion of an Aptijchopsis, 

 but it is regarded by Mr. Clarke as a folded Spnthiocaria. 



(If belonging to the former, the shield, when comjjlcte, would have 

 been about 40 mm. long and 40 nmi. where widest; in shape obovate, 

 with narrow, pointed po.sterioi-; and with a relatively shallow nuchal 

 suture, sloping jit 20°, and cutting off a broad cephalic portion.) 



Mr. Clarke has found man}' examples of Spalluocaris folded laterally 

 (see 'Amor. Journ. Sci.' ser. 15, vol. xxv. p. 124). 



Spathtocnris EmevKonn, as described in the ' Amor. Journ. Sci.' for 

 June 1882, has been found by ^Ii*. Clarke abundantly in some of tho 

 Devonian strata of New York State. In 1882 he had already obtained 

 thirty specimens from a layer only a few inches thick ; they varied much 

 in size, from a length of 4 mm. to 00 mm.; and a fragment of a largo 

 individual, probably 80 or !•() mm. long, was met with. 



They occurred in these beds : — 



Chemumj Group. — Chemung proper, Naples, Ontario co, ; Lower 

 Chemung Sandstone, Canadice, Ontario co. 



Portaije Group. — Upper Portage Sandstone, Wyoming co., Portage- 

 ville ; Upper Black Band, Naples, Ontario co., aad elsewhere ; Lower 

 Black Band, Bristol, Ontario co. 



In the lower muddy shales the associates are the common fossils of tho 

 Portage rocks, including Gonlatites complanatus, II. &c. In the bituminous 

 shales of tho ' Upper Black Band,' they occur with fish-remains (PalceO' 

 niscus, &c.), conodonts, annclidan teeth, plant-remains, and sporangia of 

 cryptogams ; in the Chemung, in the lowest horizon, with Leiorhynchus 

 incsacosialh, Hall : and in tho upper only with Crustaceans allied to 

 tSpathiocaris, namely, Dlptcrocarls {op. cit. p. 121, &c.) 



2. Spathiocaris ungnlimi, J. M. Clarke, 1884. ' Neues Jahrb. fUr Min.' 



&c., 1884, vol. i. p. 182, pi. 4, f. 4. 

 An oval shield ; length (complete), judging by the figures, would be 

 about 34 mm. ; width 2G mm. Cephalic notch narrow and deep, reaching 

 nearly to the centre ; slope about 75°. Hare, Upper Devonian, from 

 Bicken, near Herborn. Very closely allied to Biscinocaris. 



< Spathiocaris. 



r Upper Devonian, New York State. 

 o .,. . „ .. J Wilbout Goniatite.s in the Chemunpr and 



^ ' I Upper Portage Groups. 



I^With Uoniiitites in the Lower Port; ge Group. 

 „ w/>^?*Zt«a, (in Goniatitc bed) Upper Devonian, Nassau. 



' If looked at, according to our plan, with the anterior end upwards. 

 1884. a 



