7.; 



this is almost the only difference that can be detected between the two 

 shells. At the same time only one example of each has yet been 

 collected, so that there is not sufficient material for a critical compar- 

 ison. Y. nasuta was originally described from " a single specimen in 

 the collection of the Californian Academj' ot Sciences, labelled Los 

 Angeles." In Vol. II. of the " Palaeontology of California," Mr. Gabb 

 makes the " nnqualitied statement " that the species is undoubtedly 

 Tertiary," but expresses a doubt of the correctness of the locality 

 on the label. If the writer of these pages is not misinformed, the 

 Californian Academy has in its possession a collection of fossils from the 

 same part of the Queen CLai'lotte Islands as that visited by Mr. 

 Richai'dson, and there is a bare possibility that the two fossils may have 

 been obtained from the same district. Mr. Gabb's assertions that the 

 lithological characters of Y. nasuta " place it outside of all the known 

 Cretaceous, and that its geological horizon is probably either Miocene or 

 Post Pliocene, are, however, by no means in favour of this hypothesis. 



NuouLA. (,Sp. nndt.) 



A cast of the right valve of a moderately convex, ovately triangular 

 species of Nucula, with the anterior (and longer) side j)artly broken off. 

 The impressions of the numerous anterior teeth are very clear and well 

 defined, so that there is no doubt to what genus the shell belongs, but dts 

 specific peculiarities are entirely unknown. 



CucuLL^A (?) (Sp. undt.j 



Two broken and water-worn casts of a large, elongated and veiy 

 ventricose species of Cucullcea (?) with tumid and very .prominent 

 beaks, which are placed a little in front of the centre of the hinge line. 

 It differs materially in shape from a shell which is abundant in the 

 Cretaceous rocks of Vancouver and Sucia Islands, and which seems to be 

 identical with the Cucullcea truncata of Gabb. The latter species, and 

 perhaps both, scarcely belong to Lamarck's genus Cucullcea, as recently 

 re-defined, but have more of the character of Trigonoarca, Conrad. 



MoDioLA, (Sp. undt.) 



Shell elongated, narrowly oblong, slightly curved; very ventricose, 

 thickest in the direction of a line which might be di-awn from the upper 

 part of the beaks to the base of the posterior end. Superior border, 



