408 MISS G. L. ELLES ON THE WENLOCK [May I9OO, 



tubular in form with reflexed apertures ; inner wall straight or very 

 slightly curved, outer wall bent into an elongated slight double 

 curve. The thecae are inclined at 10°, and number twenty-three to 

 the inch (eight or nine in 10 mm.). 



This species is allied to M. scanicus, Tullb., but differs in the 

 absence of curvature of the rhabdosoma and in the number of 

 thecae in a given unit of length. 



Horizon. — Zone of Cyrtoyraptus Lundyreni. 



Localities. — River Irfon ; Trewem Brook. 



Monograptus tustis (Barr.) var. inornatus nov. (Text- 

 fig. 20). 



The true M. testis has not yet been recorded from this country, 

 and this variety has only been found by Prof. Watts and myself in. 

 the Long Mountain district. In general 

 Pig-. 20. — M. testis, appearance (curvature, etc.) the variety agrees 

 var. inornatus nov, closely with the typical form, but the charac- 

 ters of the thecae are very different. 



They present in general the form charac- 

 teristic of M. Flemingii, that is, a lobed 

 apertural part furnished with a short denticle. 

 In the typical form the apertures are slightly 

 concave and furnished with very long 

 spines, which appear to be entirely absent in the English variety. 



In addition the thecae are more closely set than in the type, 

 being as many as thirty-six to the inch (nearly fifteen in 10 mm.), 

 against twenty-five in the typical form (ten in 10 mm.). 

 Horizon. — Zone of Cyrtoyraptus Lundgreni. 

 Localities. — Trewern Brook; Garbett's Hall; Ackley Lane. 



2. Genus Ctrtograptus, Carruthers. 



Ctrtograptus Carruthersi, Lapw. = (?) Monograptus 



Nilssoni (Barr.). (Text-figs. 21 & 22, p. 409.) 



Lapworth, ' Scottish Monograptidye ' Geol. Mag. 1876, p. 321 & pi. x, figs. 6a-c. 

 Tullberg, ' Skanes Graptoliter ' pt. ii (1883) Sver. Geol. Undersokn. ser. C, no. 65, 

 p. 37 & pi. iv, figs. 15-18, also pi. iii, fig. 25. 



The species M. Nilssoni was originally figured and described by 

 Barrande in 1850 in his classical work the ' Graptolites de Boheme/ 

 p. 51 & pi. ii, figs. 16, 17 & 18. Lapworth pointed out in 1876 

 (op. cit.) that more than one species has been figured by Barrande 

 under this title, and he stated that fig. 16 of pi. ii was the only 

 one to which the diagnosis fully applied. In lb83 Tullberg 

 (op. cit. p. 17 & pi. i, figs. 31, 32) followed Lapworth in 

 taking Barrande's fig. 16 as the type-form, but he also regarded 

 fig. 17 as belonging to the species. More recently Perner x has 

 pointed out that Barrande's three original figures stand for three 

 distinct species. Barrande's fig. 17 he referred to Tullberg's 

 Cyrtoyraptus Lundyreni, and fig. 18 he identified with his own 



1 ' Graptolites de Boherae ' pt. iii, sect, b (1899) p. 7 & pi. xvii, figs. 1, 2, 7. 



