CRYPTOGRAPTUS. 299 



Var. Schaferi, Lapworth. Plate XXXII, figs. 13 a— c. 



1880. Cryptograptus tricornis var. Schaferi, Lapworth, Ann. Mag. Nat. Hist. [5], vol. v, pi. v, 

 figs. 28 a and b. 



A well-marked variety of Cryptog. tricornis is fairly common in the Llandeilo 

 beds of certain localities. It was figured in 1880 by Lapworth as var. Schaferi, 



but has not hitherto been described. This variety 

 Figs. 201 a and b.— Cryptograptus tri- \ s somewhat wider than the typical form in the 



cornis, var. Schaferi, Lapw. 



obverse aspect (perhaps therefore the polypary 

 was somewhat less concavo-convex), and the ex- 

 tremely short free edges of the thecse are produced 

 into distinctly mucronate extensions, but there are 

 no conspicuous basal spines. 



The downward direction of growth of th. I 1 is 



a. Young stage, showing sicula and th. i i • j_i • • ± n •• i i 



i«; reverse aspect. On same slab very marked m this variety, and it would appear 



b. Son\e P whS5st ge 3 showin g sicula (Fig- 201 &) ^at th. 1» also grew downward. It 



and thv and th. v>-, obverse aspect. ig t k nown at w } iat point the upward direction 



On same slab as fig. 200 a. 11 



of growth commences. 



Horizon and Localities. — Llandeilo, Glenkiln Shales. 



Wales : Llandeilo ; Abereiddy Bay ; behind Pencerrig House, near Builth ; 

 Gwern-y-fed-fach, Builth; Llandrindod. 8. Scotland: Tottleham's Burn, Urr 

 Water ; Kirriemore Burn, Minnoch Water. 



Associates, etc. — Var. Schaferi occurs in fair abundance in the Builth District at 

 various localities north of Llandrindod Wells associated with Dicellog. sextans, 

 Nemag. pertenuis, and Thysanog. retusus. 



Collections. — Sedgwick Museum, Lapworth, and the Authors. 



Cryptograptus Hopkinsoni (Nicholson). Plate XXXII, figs. 15 a and b. 



18G9. Diplograptus Hopkinsoni, Nicholson, Arm. Mag. Nat. Hist. [4], vol. iv, p. 234, pi. xi, fig. 7. 

 1898. Cryptograptus Hopkinsoni, Elles, Quart. Journ. Geol. Soc, vol. liv, p. 520. 



Polypary robust, 1 — 2 cm. in length, with average uniform breadth of 2 mm., 



base adorned with two long curved spines. Thecse ten in 10 mm., of 



general Cryptograptus type but with free edges of all thecse provided 



with spines. 



Description. — The polypary in Cryjptog. Hopkinsoni is relatively wide, apart 



from the spines which give it still greater apparent breadth ; it is commonly 



small, not exceeding 2 cm. in length. 



