438 NEW YORK STATE MUSEUM 



Climacograptus caudatus Lapworth 



Plate 28, figure 17, 18 



Climacograptus caudatus Lapworth. Cat. West. Scott. Foss. 1876. p. 6, 



pi. 2, fig. 48 

 Climacograptus caudatus Lapworth. Belfast Field Club. Rep't & Proc. 



v. 1, pt 4, apx. 1877. p. 138; pi. 6, fig. 34 

 Climacograptus cf. caudatus Linnarsson. Sver. Geol. Und. Ser. C, 



no. 31. 1879. p. 18 

 Climacograptus caudatus Lapworth. Ann. & Mag. Xat. Hist. Ser. 5. 



1880. 5:358; 1880. 6:22 

 Climacograptus caudatus Tullberg. Sver. Geol. Und. Ser. C, no. 50. 



1882. p. 20 

 Climacograptus caudatus Lapworth. Geol. Mag. Ser. 3. 1889. v. 6, 



table 11, facing p. 68 

 Climacograptus bicornis var. caudatus Ami. Can. Geol. Sur. Rep't. 



Ser. 2. 1889. v. 3, pt 2, p.n6K 

 Climacograptus caudatus Gurley. Jour. Geol. 1S96. 4:297 

 Climacograptus caudatus Roemer & Freeh. Lethaea Pal. 1897. 1 :6i4< 



fig. 179 

 Climacograptus caudatus Ruedemann. N. Y. State Mus. Bui. 42. 1901. 



p. 520 et al. 

 Climacograptus caudatus Elles & Wood. Monogr. Brit. Grapt. pt 5. 



1906. p. 202, fig. 133; pi. 27, fig. 7 



Description. Synrhabdosomes not observed. Rhabdosome long and 

 slender, attaining a length of 60+ mm (exclusive of virgella) and a width 

 of 2. 1 + mm; very narrow at the sicular extremity (.4 mm) and widening 

 very gradually, the full width not being attained until 25 mm from the sic- 

 ular extremity. Lateral face apparently smooth. Virgella long (32+ mm) 

 and hairlike, in proximal portion (ca. 5 mm) accompanied by a broader 

 sheathlike process. Sicula not observed. Thecae numbering 10 to 12 in 

 10 mm, middle third of ventral wall concave, inclined at an average angle ol 

 40"; overlapping about one third ; distal third slightly inclined. Apertural 

 margin concave, apertural excavation round, occupying one fourth ol width 

 of rhabdosome, in length equal to one third the ventral margin. Septum 



