AJjGM OF WEST IRELAND- 151 



tt46. Cosmarhjm Nuttallii, nov. sp. (PL XXI. fig. 5.) 



C. mediocre, diametro circiter 1^-plo longius, modice con- 

 strictum, sinu sublineari et introrsum ampliato ; semicellulse 

 subsemiorbiculares, angulis inferioribus subrectangularibus in 



ambit u (10) undulate, granulis 4 intra utrumque marginem 

 lateralem (uno sub utraque duarum inferiorum undularum et 

 duobus sub undula terfcia de basi), et 4 ad apicetn (uno utroque 

 parvo sinui, quarto infra granulum centralem) ; a vertice visas 

 subellipticae, polis truncatis leviter tetraundulatis, medio in- 

 flate ; a latere visae quadrato-ovales, apice tetraundulatae, inflate 

 versus basin ; isthmus a vertice visas oblongo-truncatus ; mem- 

 brana dense et minute punctata, medio laevi et incrassato ; pyre- 

 noidibus binis. 



Long. 45//; lat. 32/x; isthm. 16 X 11 fi ; crass. 23 /*. 



I. Balljnahinch ; Athry Lough ; Clifden. 



This can be compared with its nearest ally C. subundulatum, 



Wille (Bg. til Kuuds. om Norgea Ferskv. Alg. p. 27, tab. 1. 

 fig. 9) . 



* 



Named after my botanical companion in these and many other 

 tours, Wm. Nut tall. 



47. C. undulatum, Corda. {Aim. de Carlsbad, 1839, p. 243, 



tab. 5. fig. 26 ; Rolfs, Brit. Desm. p. 97, tab. 15. fig. 8.) 



I. Near Westport ; Creggan Lough : Lough Aunierin ; Lakes, 

 Clifden to Bounds tone. — II. Carrantuohill. 



ffVar. Wollei, nov. var. [C. undulatum, Corda, var. cren- 

 ulatum, Wolle {Desm. U. S. p. 67, tab. 16. figs. 10, 19, 

 20), non Wittr. {Anteckn. om Skand. Desm. 1869, p. 11).] 

 I. Near Oughterard. 



48. C. monomazum, Lund. {Desm. Suec. p. 32, tab. 3. f. 11.) 



Var. poltmazuai, Nord. {Sydl. Norges Desm. p. 14, tab. 1. 

 %. 3.) 

 Long. 37-5 ^ ; lat. 33-34 ^ ; lat. isthm. 10-12 /x ; crass. 20 /z. 

 I. Ballynahinch ; Lough Aunierin. 



49. C. tetraopiithalmum, Breb. in Ralfs, Brit. Desm. p. 98, 

 tab. 17. fig. U, tab. 33. fig. 8. 



Long. 103-111 n ; lat. 72-77 /i ; lat. isthm. 18-23 /x ; crass. 48 fi. 



I. Creggan Lough ; Lough Aunierin ; Lough Shannaeloon- 



tippen ; Arderry Lough ; Athry Lough ; Derryclare Lough ; 



LINN. JOURN. BOTANY, VOL. XXTX. N 



