214 



In the Palseontology of California* Mr, Grabb describes a shell which 

 he refers with much doubt, tirst to the g-enus Ptyclwceras or Samites, 

 and finallj" to Ancyloceras under the name A. guadratus, which resem- 

 bles the present shell in its septation, as well as in the fact that its 

 surface is said to be marked with distant periodical constrictions. The 

 outline of a transverse section of A. quadratus, however, is described 

 as sub-quadrate and its sculpture is rej^resented as consisting of " very- 

 small rounded ribs." The s])ecimcns described above are so imperfect 

 that it is impossible to say whether they should be placed in the genus 

 Hamites, Ptychoceras, Hamulina, Ancyloceras, or Anisoceras, but their 

 sculpture, apart fi'om the periodic constrictions, appears to have been 

 smooth, and they are certainly elli])tic ovate in transverse section. 



GASTEROPODA. 



ISTertnyT^a Maudensfs. (N. Sp.) 

 Plate. 27, figs. 2, 2a, 2h, 2c, and 2d. 



Shell turreted, very long and slender : Avhorls exceedingly numerous, 

 the early ones obliquely flattened or slightly dej)ressed, the later ones 

 concave in the middle and highest at the suture : suture very indis- 

 tinct, placed in the centre of a prominent and continuous spiral ridge, 

 which is rounded at the summit. Outline of aperture unknown. Sur- 

 face of the later whorls encircled by fi-om six to seven tine and thread- 

 like spiral raised lines. Longitudinal sections show that a triangular 

 and acutely pointed spiral ridge or fold revolves around the inner sur- 

 face of the outer wall of all the volutions. 



East end of Maud Island, o^sposite Leading Island, in Skidegate 

 Inlet : not uncommon in brittle and very fi-iable shale. 



As the shale breaks readily in all dii-ections when diy and as the 

 species is long, slender and fi'agile, the large sjjecimens, which are 

 often miich distorted, are invariably broken. The length of the largest 

 fragment collected (fig. 2), which consists of six of the lower volu- 

 tions, is forty-five millimetres, and its breadth is nine mm. at the 

 smallest end and seventeen mm. at the largest. A very young indi- 

 vidual (fig. 26), whose apex is unusually perfect and which measures 

 sixteen mm. (or five-eights of an inch) in length, and a little less 

 than five mm. in breadth at the larger end, has as many as fourteen 



* Volume 1, pp. 74 and 75, pi. 14, fig. 21a, pi. 15, fig. 21 : also volume 2, p. 213. 



