Prof. W. King on Agulhasia Davidsonii. 109 



whorls tumid, the other witli a long and slender spire and with 

 the whorls somewhat compressed. — H. W. 



EXPLANATION OF PLATE V. 



Figs. 1 a, b. Ebora crassilahra^ Conrad, enlarged to twice and a half. In 

 fig. 1 « is seen a circular hole made by a Natica or liuccimiin. 



Figs. 2 a, b. Neritina Ortoni, Conrad. 



Fig. 3. Nesis bella, Conrad, enlarged. 



Figs. 4 a, b. Odostomia ?, Fleming : fig. a, natural size ; fig. 6, enlarged. 



Figs. 5 a, b. Anisothyris obliqua, Conrad : fig. a, anterior side ; fig. b, left 

 side. Natural size. 



Fig. 6. Anisothjris carinata, Conrad, left side. Natural size. 



Figs, 7 a-d. Anisuthyris Hauxtvclli, H.Woodw. : fig. o, left side, with valves 

 united ; fig. b, view of interior of left valve ; fig. c, view of inte- 

 rior of right valve ; fig. d^ valves united, ventral margin, natural 

 size. 



Fig. 8 a. Anisothyris euneata, Conrad, anterior side, valves united, 

 natural size ; fig. 8 b, right side. 



Fig. 9 a. yinisothyris crecta, Com'ad, anterior side, valves united ; fig. 9 6, 

 left side, natural size. 



Fig. 10. Anodon Batesii, H. Woodw., left side, natural size. 



XIII. — On Agulhasia Davidsonii, a neio PalUohranchiate 

 Genus and Species. By WiLLiAM King, Sc.D., Professor 

 of Mineralogy and Geology in Queen's College, Galway. 



[Plate XI. figs. 1-8.] 



My friend Mr. Thomas Davidson, F.R.S. &c., has kindly 

 placed in my hands two specimens of an undescribed shell 

 (see PI. XI. figs. 1-7) possessing some unusual characters; and 

 as he Avishes me to describe it, I most willingly undertake what 

 is to me a pleasing duty. 



After some consideration I have come to the conclusion that 

 the shell must be regarded not only as a new species, but as 

 typical of a new genus ; and as such I am, for the present, dis- 

 posed to place it in the family Terebratulidse*^ 



Genus Agulhasia, mihi. 



Diagnosis. — Areigerous. Beak pointed. Deltidium closed 

 by a plate fixed to the inner surface of the area. Foramen at 

 the cardinal termination of the deltidium. L0020 short, slightly 



* I have elsewhere (Proc. Dublin University Zool. & Bot, Assoc. 

 1859, vol. i. pp. 517, 518) restricted the family Terebratulidoe to genera 

 with a small loop &c., as in Terebratula vitreu ; and have included those 

 with a long loop and some other differential characters in a distinct 

 ftimily, which I have named Waldheimiidas, after the typical genus. 



