OBOLIDiE. 491 



It should also be compared with Lingulella ampla (Owen) (PI. XXVIII, figs. 1, la-j) of the 

 Mississippi Valley. 



The specific name was given in honor of Mr. J. E. Davis, who first called attention to the 

 species. 



PoBMATioN AND LOCALITY." — Oidoviciaii : (304ii) "Coniston (Bala) limestone" [McCoy, 1854, p. 254], at Coniston, 

 Lancashire, England. 



Upper Cambrian : (366d) Lower Lingula flags at Carnedd Filiast, Bangor; (366e) Lower Lingula flags at Marchillyn- 

 mawr, Llanberis; both [Davidson, 1866, p. 57] in Carnarvonshire, North Wales. 



Lower Lingula flags at the following localities: (366f) Ffestiniog; (366g) Dolgelly; (3661i) Pen-y-Biyn, 5 miles (8 km.) 

 north of Dolgelly; (366i) Llyn Dywarchen; (366j) Pont Nan t-y-Lladron, on the Bala Road; (366k)6 Penvwrfa: (3661)& 

 Tremadoc; and (366m) 6 near Nant-y-Groes, locst of Bala; all [Davidson, 1866, p. 57] in Merionethshire, North Wales. 



(366n) Lower Lingula flags at Portmadoc; (366o) "Bala schists" [McCoy, 1854, p. 254] at Bryn Melyn, near Bala; 

 (366p [Davidson, 1866, p. 57]) Upper Tremadoc beds at Deudraeth; (366ci [Davidson, 1866, p. 57]) Upper Tremadoc beds 

 at Garth, opposite Portmadoc ; and (366a) upper portion of Middle Lingula flags, 6 miles (9.6 km.) east of Ffestiniog; all 

 in Merionethshire, North Wales. 



(366r) Shale 2 miles (3.2 km.) north of Builth, Brecknockshire; and (366 [Davidson, 1866, p. 57]) atWhitesand Bay, 

 near St. Davids Head, Pembrokeshire; both in South Wales. 



(318m [Davidson, 1866, p. 57]) Near the base of the lower black slates, in the Waterfall Valley near Maentwrog, 

 North Wales. 



(307a [Matthew, 1903, p. 203]) Shales of Division C3c2 of Matthew on McLeod Brook (=Barachois River), near Bois- 

 dale, eastern Cape Breton, Nova Scotia, Canada. 



(389d [Kayser, 1897, p. 280]) Iruya, Province of Salta, Argentina, South America. 



(332 [Kayser, 1883, p. 35]) Limestones at Saimaki, Liaotung, China. 



1 , Lingulella delgadoi n. sp. 

 Plate XXIX, figures 6, 6a-c. 



Lingulepis acuminata meeJci Delgado [not Walcott], 1904, Communicagoes Commissao Servijo Geol. Portugal, tome 5, 

 fasc. 2, pp. 366-367, PI. IV, figs. 17 and 27; PI. VI, fig. 9. (Characterized and discussed in French. A photo- 

 graph of the specimen represented by fig. 27 (reverse view) is reproduced in this monograph, PI. XXIX, 

 fig. 6b.) 



Lingulella granvillensis Delgado [not Walcott], 1904, idem, pp. 367-368, PI. IV, figs. 15, 16, 18, and 19. (Discussed in 

 French. Photographs of the specimens represented by figs. 16 and 18 are reproduced in this monograph, 

 PI. XXIX, figs. 6 and 6a, respectively.) 



Lingulella ferruginea Delgado [not Salter], 1904, idem, pp. 368-369, PI. IV, figs. 20 and 21; PI. VI, fig. 2. (Discussed 

 in French.-) 



Lingulella cf. linguloides Matthew, Delgado, 1904, idem, pp. 369-370, PL IV, fig. 14. (Described and discussed in 

 French. A photograph of the specimen represented by fig. 14 (reverse view) is reproduced in this monograph, 

 PI. XXIX, fig. 6c.) 



This is one of the abundant and variable forms in the fauna of the Province of Alemtejo. 

 It may be compared in tliis respect with the widely distributed Lingulella ferruginea Salter. 

 Delgado vcompares different phases of it to three species, two of which, L. ferruginea Salter and 

 L. cf. linguloides IMatthew, I think are specifically the same. Lingulella granvillensis Walcott 

 has the same flattening along the median line of the ventral valve. As stated by Delgado 

 [1904, p. 367], there is a strong resemblance between the representatives of the two forms, but I 

 think that it is better to give the Portuguese form a distinct specific name than to identify it 

 with the American species. 



Delgado sent me enlarged photographs of the specimens of the three varieties which he 

 recognized and illustrated, and I have reproduced four of them, Plate XXIX, figures 6, 6a-c. 



It is quite probable that if I had all of Delgado's specimens to study a different disposition 

 would be made of the specific references, but with present knowledge and experience of the 

 variability of species like this, especially where the shells have been more or less misshaped by 

 lateral movement in the "schists," I prefer to combine the forms in one species. 



The specific name is given in honor of the late Dr. J. F. Nery Delgado. 



Formation and locality. — Lower Cambrian: (351 [Delgado, 1904, pp. 366-369]) Shales at Monte de Valbom, 

 northeast of Villa Boim, Province of Alemtejo, Portugal. 



oThe species also occurs in Locality 317b (p. 248). 



>> Davidson does not state wiiioh ot tlie three localities {366k, 366 1, or 366m) is the type. 



