ACROTKETIDvE. 647 



ACEOTHELE MACULATA (Salter). 

 Plate LVII, figures 2^a-b; Plate LVIII, figure 2. 



Oholella maculata (Hicks MS.) Salter, 1866, Kept. British Assoc. Adv. Sci. for 1865, p. 285. (Name merely listed.) 

 Obolella maculata Salter, Davidson, 1868, Geol. Mag., vol. 5, p. 311, PI. XVI, figs. 1-3. (Described as below, and 



discussed. Figs. 1-3 are reproduced in this monograph, PL LVII, figs. 2, 2a-b, respectively.) 

 Oholella maculata Salter, Davidson, 1871, British Fossil Brachiopoda, vol. 3, pt. 7, No. 4, p. 341, PL L, figs. 18-21. 



(Copy of preceding reference. Figs. 18, 19, and 21 are copied from Davidson, 1868, PL XVI, figs. 1, 2, and 3, 



respectively.) 

 Not Obolella maculata Delgado, 1904, Communicafoes Commissao Servigo Geol. Portugal, tome V, fasc. 2, p. 364, 



PL IV, fig. 24. (Described in French. This species is referred in this monograph to Acrothele villaboimensis .) 



The description by Davidson [1868, p. 311] follows: 



Shell small, transversely oval, valves moderately convex; 4 lines in length, by 5 in breadth. Beak very obtusely 

 acuminated; front broadly rounded; greatest breadth at about the middle of the shell; surface smooth, marked only 

 by fine concentric lines of growth. Interior incompletely known. 



From the above description it is not possible to refer this species to Acrothele, but the 

 figure given of the interior of the dorsal valve clearly indicates that genus. All of the figures 

 given by Davidson appear to be of dorsal valves. It would be interesting to know if the 

 specimens illustrated by Davidson [1871, PI. LIX, figs. 41a, 42a] as "Discina fileolus Hicks" 

 are associated with the specimens illustrated as "Oholella maculata Hicks" [Davidson, 1871, 

 PI. L, figs. 18-21]. 



With our present information it is difficult to ma,ke comparisons with other species of 

 Acrothele further than to call attention to the similarity of the interior of the dorsal valve to 

 that of Acrothele subsidua (Wliite) (PI. LX, fig. Ik). 



Formation and locality.^ — Middle Cambnan: (318d [Davidson, 1871, p. 341]) Sandstone in the middle portion 

 of the Menevian at Porth-y-rhaw, St. Davids; and (318h.) shales in the Menevian at St. Davids; both in South Wales. 



(318e) Lower portion of the Menevian, at Camlan; and (318f) lower portion of the Menevian at Gwynfynydd; 

 both [Davidson, 1871, p. 341] in North Wales. 



ACKOTHELE MATTHEWI (Hartt). 



Plate LXI, figures 1, la-g. 



lAngula matthewi Hartt, 1868, Acadian Geology, by Dawson, 2d ed., p. 644, fig. 221. (Described as a new species. 

 The specimen represented by fig. 221 is redrawn in this monograph, PL LXI, fig. la.) 



Lingula matthewi Hartt, 1878, idem, 3d ed., p. 644, fig. 221. (Copy of Hartt, 1868, p. 644.) 



Acrothele matthewi (Hartt), Walcott, 1884, Bull. U. S. Geol. Survey No. 10, p. 15, PL I, figs. 4 and 4a. (Original 

 description copied and species discussed. The specimen represented by fig. 4a was labeled by Hartt as "Obelus 

 (Discina) nitidus," n. sp., and is redrawn in this monograph, PL LXI, fig. 1. Fig. 4 is drawn from the speci- 

 men figured by Hartt, 1868, p. 644, fig. 221, and is redrawn in this monograph, PL LXI, fig. la.) 



Acrothele matthewi (Hartt), Walcott, 1886, Bull. U. S. Geol. Survey No. 30, p. 109. (Mentioned as similar to Acro- 

 thele subsidua.) 



Acrothele inatthewi (Hartt), Matthew, 1886, Trans. Roy. Soc. Canada for 1885, 1st ser., vol. 3, sec. 4, No. 4, pp. 39-41, 

 PL V, figs. 15 and 15a. (Original description copied and species redescribed and discussed.) 



Acrothele matthewi (Hartt), Walcott, 1891, Tenth Ann. Rept. U. S. Geol. Survey, p. 609. (Mentioned as closely 

 allied to Acrothele subsidua (White).) 



Lingula matthewi Hartt, 1891, Acadian Geology, by Dawson, 4th ed., p. 644, fig. 221. (Copy of Hartt, 1868, p. 644.) 



Acrothele matthewi (Hartt), Hall and Clarke, 1892, Eleventh Ann. Rept. State Geologist New York for 1891, PL III, 

 fig. 24. (Fig. 24 is drawn from the specimen figured by Matthew, 1886, PL V, figs. 15 and 15a.) 



Acrothele matthewi (Hartt), Hall and Clarke, 1892, Nat. Hist. New York, Paleontology, vol. 8, pt. 1, pp. 99 and 100, 

 PL III, fig. 29. (Discussed. Fig. 29 is copied from fig. 24 of the preceding reference.) 



Acrothele matthewi (Hartt), Matthew, 1895, Trans. New York Acad. Sci. for 1894-95, vol. 14, p. 128, PL V, figs. 6a-b. 

 (No text reference. Figs. 6a-b are copied from Matthew, 1886, PL V, figs. 15 and 15a, respectively.) 



Acrothele matthewi (Hartt), Matthew, 1902, Bull. Nat. Hist. Soc. New Brunswick, vol. 14, pt. 5, No. 20, pp. 397 and 

 402, PL XVII, figs. 5a-b. (Mentioned. Pigs. 5a-b are copied from Matthew, 1886, PL V, figs. 15 and 15a, 

 respectively.) 



Acrothele matthewi (Hartt), Matthew, 1903, Geol. Survey Canada, Rept. Cambrian Rocks Cape Breton, p. 104, PL V, 

 figs. 5a-b. (Mentioned. Figs. 5a-b are copied from Matthew, 1902a, PL XVII, figs. 5a-b, respectively.) 



o The type locality is unknown. Davidson's figure 3 (186S, PI. XVIJ has been designated as the type, but its locality is unknown. 



