956 DR F. K. C. REED ON THE 



Ccelospira scotica (M'Coy). 



1851. Atrypa hemispherica, Sow., var. (Hemithyris scotica, M'Coy MSS.), Salter, Quart. Journ. Geol. 



Soc, vol. vii, p. 178, pi. ix, fig. \2a-c. 



1852. Hemithyris hemispherica, var. scotica, M'Coy, Syn, Brit. Pal. Foss. Woodw. Mus., p. 202, 



pi. iH, fig. 10. 

 1866. Atrypal scotica (M'Coy), Davidson, Mon. Brit. Foss. Brach., vol. iii, p. 140, pi. xiii, fig. 31. 

 1883. Atrt^al scotica (M'Coy), Davidson, op. cit., vol. v, Silur. Suppl., p. 224. 



The original locality for this species is Mulloch Hill. The differences between it 

 and C. hemispherica were pointed out by M'Coy (op. cit.). We may add that the 

 division of the ribs is somewhat irregular, that there is an incipient fold on the 

 pedicle-valve marked off by rather deeper grooves on each side than those between 

 the ribs and corresponding to the shallow sinus on the other valve. The internal 

 characters seem to be identical. Davidson, however, in his Supplement (op. cit,, 

 p. 224) does not put C. scotica in the same genus (Leptocoelia) as C. hemispherica. 



Horizon. — (l) Mulloch Hill Group. 



Localities. — (l) Mulloch Hill, Craigens, Auld Thorns. 



Coelospira scotica (M'Coy), var. 

 (Plate XXIV, figs. 56-58.) 



The Middle Llandovery examples of C. scotica seem to constitute a fairly marked 

 variety of the Mulloch Hill type, for there is always a distinct simple single median 

 rib on the pedicle-valve, and the 2 or 3 ribs on each side of it divide into 2 equal 

 smaller ones at about half their length, while the remaining lateral 4 or 5 ribs 

 outside are simple. In the brachial valve there is a median groove in the sinus 

 corresponding to the median rib. Otherwise the shells seem to be identical with 

 the typical form. Some of them reach a length of 12-13 mm. 



Horizon.- — Saugh Hill Group. 



Localities. — Newlands, ? Woodland Point. 



List of Species described, with Davidson's Equivalents. 



[The numbers refer to the collections in which the species is represented ; see page 2.] 



(1), (7) Micromitra (Paterina) Davidsoni, sp. no v. [Acrotreta Nicholsoni (pars)]. 

 (1), (2), (3), (7) Obolus audax, sp. no v. [Lingula Kamsayi (pars)]. 



(1), (2), (7) ,, Maccullocld, sp. nov. [Lingula Kamsayi (pars)]. 

 (1), (2), (3), (4), (5) Paterula balclatchiensis, Dav. [Paterula balcletchiensis], 

 (1) ,, 1 albida, sp. nov. 



(1) ,, 1 Jamesoni, sp. nov. [Discina 1 ? balcletchiensis (pars)]. 

 (1) Dinobolus Davidsoni (Salt.) [Dinobolus Davidsoni]. 

 (1) Bhinobolusl balclatchiensis, sp. nov. 

 (1), (2), (3), (4) Lingula amabilis, sp. nov. [Lingula attenuata (pars)]. 



(1) ,, brevis, Portl., var. nov. angustior [Lingula brevis (pars)]. 

 (1), (2), (3) „ brevis, Portl., var. nov. carrichensis [Lingula brevis (pars)]. 



