OBOLELLIDiE. 607 



one scar (cl, PL LVII, fig. 4k), but in a larger shell the transmedian scars are separated back of 

 the middle and outside lateral scars, which can not be distinguished as separate scars. 



Observations. — Redlich [1899, p. 5] proposed the genus "Moiergia" for this species. This was 

 well done, but Matthew [1891, p. 148] had previously described Botsfordia. Botsfordia granu- 

 lata (Redlich) has the same type of interior in both valves as B. pulcJira (Matthew), and the 

 granulated surface is of the same general type except that it is more completely developed in 

 B. pulchra. There is a strong generic relation to Botsfordia csslata (Hall) but the specific differ- 

 ences are very decided. 



Doctor Holland, director of the Geological Survey of India, kindly sent me the type speci- 

 mens of this species, and through the courtesy of Dr. Fritz Noetling, I obtained for the United 

 States National Museum a fine collection of this species from the Salt Range. 



Formation and locality. — Middle Cambrian: (15r)<» Dark argillaceous shales, at Khussak, Salt Range, India. 



Botsfordia ptjlchea (Matthew). 

 Plate LXII, figures 5, 5a-l. 



Linguldla (?) cf. Lingulafavosa Linnarsson, Matthew, 1888, Canadian Rec. Sci., vol. 3, No. 1, pp. 28-29. (Mentioned.) 



Oboliis pulcherM ATTHE^\, 1889, idem, vol. 3, pp. 306-307, figs. 1-8, p. 306. (Described and discussed as a new species.) 



Obolus pulcher Matthew , 1890, Trans. Roy. Soc. Canada for 1889, Istser., vol. 7, sec. 4, No. 12, pp. 151-155, PI. VIII, 

 figs, la-m, 2a-l. (Description given by Matthew, 1889, pp. 306-307, copied, and species described and discussed 

 in great detail. Figs, la-c and 2a-c are copied from figs. 3-8, respectively, of the preceding reference.) 



Oholus {Botsfordia) pulcher Matthew, 1891, idem for 1890, vol. 8, sec. 4, No. 6, p. 148. (Mentioned.) 



Obolus (Botsfordia) pulcher Matthew, 1892, idem for 1891, vol. 9, sec. 4, No. 5, pp. 62-63. (Discussed, the new sub- 

 generic name being proposed on page 63.) 



Obolus f pulcher Matthew, Hall and Clarke, 1892, Nat. Hist. New York, Paleontology, vol. 8, pt. 1, p. 81, PI. IV k) 

 fig. 22. (Characterized, questioning generic reference.) 



Obolus? pulcher Matthew, Hall and Clarke, 1892, idem, p. 183. (Characterized and discussed, copying Matthew's 

 notes, 1890, p. 154, on the stages of growth and development. Calls attention to resemblance of this species, in 

 growth stages, to Kutorgina.) 



Obolus (Botsfordia) puk/jra Matthew, 1894, Trans. Roy. Soc. Canada for 1893, 1st ser., vol. 11, sec. 4, No. 8, pp. 90-91, 

 PL XVI, figs. 3 and 3b. (Described and discussed.) 



Obolus (Botsfordia) pulchra Matthew, 1895, Trans. New York Acad. Sci. for 1894-95, vol. 14, pp. 115-121, PI. Ill, 

 figs, la-i, Ik, 2a-g, 2i, and 2k (the missing figures are lacking in the reference; they have not been referred 

 elsewhere in this monograph). (With the exception of the note on the horizon in the first paragraph, the text is 

 copied from Matthew, 1890, pp. 151-155. Figs, la-i, 2a-g, and 2i are copied from Matthew, 1890, PI. VIII, figs, 

 la-i, 2a-g, and 2i, respectively. Figs. Ik and 2k are copied from Matthew, 1894, PI. XVI, figs. 3b and 3, 

 respectively.) 



Obolus (Botsfordia) pulcher Mattsbw , 1902, Trans. Roy. Soc. Canada for 1902, 2d ser., vol. 8, sec. 4, No. 3, p. 95, PL 

 I, figs. 7a-b. (Characterized and discussed.) 



General outline subcircular; the ventral valve being obtusely acuminate and the dorsal 

 a little wider than long. Ventral valve gently convex, most elevated at or a little in front 

 of the apex; apex close to the posterior margin and pointed backward; there is a minute 

 pedicle aperture at the end of the apex. The posterior margin of the valve is arched upward 

 so as to leave only a narrow rim between the margin and the pedicle aperture. Dorsal valve 

 moderately convex, more arched toward the front in old shells, and in all shells it arches upward 

 at the posterior margin so as to fit closelj'' against the margin of the ventral valve. 



Surface marked by concentric lines of growth that form imbricating ridges at irregular 

 intervals. In addition there is a reticulated surface formed by the presence on the rounded 

 concentric ridges of small tubercles that are rounded quadrilateral in outline and that 

 alternate on the adjacent ridges, so that each tubercle falls opposite the space between 

 the two tubercles in front; this results in rows of tubercles that are apparently arranged in 

 oblique rows extending from the posterolateral margin of the shell on each side obliquely 

 forward to the margin of the shell on the opposite side; the depressions between the tubercles 

 unite and serve to increase the appearance of an oblique reticulate, tuberculated surface ; the 

 tubercles are low at the back and high in front. The finely cancellated surface is usually on 

 the posterior half of the shell, the tubercles becoming scattered and often entirely absent over 



a Specimens from the type locality were given to the United States National Museum and this number was assigned to them. 



