PRO. — ULR.] 



CRUSTACEA. 



711 



land, p. 5. [Ety. from the resemblance 

 to Primitia.] Like Priinitia externally, 

 except that the anterior end has a 

 specially smooth area, corresponding 

 with an internal portion which is par- 

 titioned off from the rest of the cavity 

 by a cross wall. Type P. planifrons. 

 punctulifera, Hall, 1860, (Leperditia punc- 

 tulifera,) 13th Eep. N. Y. St. Mus. Nat. 

 Hist , p. 92, Ham. Gr. 



Proetus determinatus, Foerste, 1887, Bull. 



Denison Univ., vol. 2, p. 91, Niagara Gr. 



longicaudus, Hall, synonym for Phillipsia 



major, 

 minutus, Herrick, 1888, Bull. Denison 

 Univ., vol. 4, p. 56, Waver] y Gr. 



Ptychoparia attleborensis,Shaler& Foerste, 

 1888, Bull. Mus. Comp. Zool., vol. 16, 

 p. 39, Up. Taconic. 

 metisensis, Walcott, 1890, 10th Ann. Rep. 



U. S. Geo. Sur., p. 651, Up. Taconic. 

 mucronata, Shaler & Foerste, synonym for 

 Atops trilineata. 



Rusichnites, synonym for Rusophycus and 

 R. acadicus ; R. carbonarius, R clinton- 

 ensis, and R. grenvillensis should be 

 referred to Rusophycus. 



Sao, Barrande, 1846, Notice preliminaire, 

 p. 13, and Syst. Sil. Boh., vol. l,.p. 382. 

 [Ety. mythological name.] Body ovate, 

 trilobation marked; head subsemicir- 

 cular ; glabella prominent, well defined ; 

 dorsal furrows deep ; .three lateral fur- 

 rows, between which are lobes in relief, 

 separated on the summit by a longitu- 

 dinal furrow ; facial sutures cut the 

 frontal border and arch outwardly to 

 the anterior projections of the eyes, and 

 the posterior branches arch in like man- 

 ner to a point at the interior of the genal 

 angle; the eye arch is prolonged in re- 

 lief toward the front of the glabella^; 

 thorax seventeen segments ; pygidium 

 small, two articulations. Type S. hir- 

 suta. 

 lamottensis is from the Chazy Gr. 



Fig. 1265.— Schmidtella crassiruarginata Inte- 

 rior and exterior views of right valve and an- 

 terior and ventral views, magnified 10 diam- 

 eters. 



Schmidtella, Ulrich, 1892, Am. Geo., vol. 

 10, p. 269. [Ety.proper.name.] Carapace 

 small, rounded, moderately convex and 

 near Aparrhites among the Leperditiidx ; 

 valves inflated in the dorsal region, 

 which projects shoulder -like over 

 and out from a nearly straight hinge- 

 line ; right valve slightly the larger, its 



ventral edge overlapping that of the 

 left ; no sulcus or tubercles. Type 

 S. crassimarginata, described at the 

 same place from the Birdseye limestone. 



Solenocaris having been preoccupied before 

 Meek used it, Vogdes proposed Strig- 

 ocaris in 1889, Ann. N. Y. Acad. Sci., 

 vol. 5, p. 34. 



Solenopleura bombifrons, Matthew, 1887, 

 Trans. Roy. Soc. Can., vol. 4, p. 156, Up. 

 Taconic. 

 harveyi and S. howleyi, Walcott, 1889, 

 Proc. U. S. Nat. Mus., vol. 12, p. 45, 

 Up. Taconic. 



Strepula, Jones & Holl, 1886, Ann. and Mag. 

 Nat. Hist., ser. 5, vol. 17, p. 403. [Ety. 

 diminutive of strepa, a stirrup, from the 

 loop-like pattern of the ridges.] Cara- 

 pace valves slightly convex, suhoblong, 

 with rounded ends, or semielliptical, 

 and bear narrow ridges that run into 

 the slightly thickened dorsal margin ; 

 the intervening furrows form hroad 

 valleys, and a subcentral tubercle or 

 lobular swelling is sometimes present ; 

 the chief ridge is a free supramarginal 

 lamina, standing outward and down- 

 ward, and hiding the real marginal 

 edge in the side view ; the edge of the 

 bivalved carapace is narrow, ovate, 

 cross-barred at the sides with ridges, 

 some straight and parallel, some ob- 

 liquely divergent. Type S. concentrica. 

 lunatifera, Ulrich, 1889, Micro-Pal. of Can., 



p. 56. Hud. Riv. Gr. 

 sigmoidalis and S. plantaris, Jones, 1890, 

 Quar. Jour. Geo. Soc, vol. 46, pp. 11, 

 510, Ham. Gr. 



Tetradella, Ulrich, 1890, Jour. Cin. Soc. Nat. 

 Hist., vol. 13, p. 112. Carapace oblong 

 or subquadrate, never tumid, hinge-line 

 straight ; surface depressed, a ridge fol- 

 lows the margin from the posterior to 

 the antero-dorsal angle ; in the inclosed 

 space two narrow ridges traverse the 

 valves in a vertical or oblique direction 

 from the dorsal edge, to the posterior 

 half of the ventral portion of the sub- 

 marginal ridge, uniting with it; the 

 union of these ridges is supposed to be 

 the most significant character of the 

 genus. Type T. quadrilirata, which is 

 a straight synonym for Beyrichia regu- 

 laris of Emmons. Mr. Ulrich refers to 

 this genus Beyrichia oculifera and B. 

 chambersi. I do not agree with him in 

 respect to the genus, or in what he 

 esteems the important characters, 

 subquadrans, Ulrich, 1890, Jour. Cin. Soc. 

 Nat. Hist., vol. 13, p. 115, Trenton Gr. 



Turrilepas canadensis, Woodward, 1889, 

 Lond. Geo. Mag., 3d ser., vol. 6, p. 274, 

 Utica slate. 



Ulrichia, Jones, 1890, Quar. Jour. Geo. Soc, 

 vol. 46, p. 543. [Ety. proper name.] In 

 form like Primitia, except there is no 

 sulcus across the valves, but instead a 

 tubercle on each side of the position in 

 which the sulcus occurs in Primitia; a 



