210 



REPORT OF NATIONAL MUSEUM, 1895. 



DALL, William Healey — Continued. 



I. A revision of the classiiication of the 

 MactridsB of the eastern coast of the United 

 States, with an enumeration of the species. 



II. This paper contains a complete revision 

 of the Mactridai of the west coast of Kortli 

 America, south to Panama, with an enumera- 

 tion of the species. 



Notes on the Miocene and Pliocene 



of Gay Head, Martha's Vineyard, Massa- 

 chusetts, and on the ' ' Land Phosphate " 

 of the Ashley River district, South 

 Carolina. 



Am. Journ. Sci., XLVill, Oct., 1894, pp. 

 297-301. 

 This paper enumerates for the first time the 

 fossils of the Miocene beds of Marthas Vine- 

 yard, and describes two new species. The 

 Pliocene is recognized in the beds above the 

 Miocene and a list of the species found in it is 

 given. It is shown that the Ashley marls of 

 South Carolina and the pbosphatic rock which 

 overlies them are probably Miocene and not 

 Eocene in age, as hitherto supposed. A list of 

 species from the phosphate rock is given, 

 which includes the characteristic Miocene 

 type Ec2>hora quadricostata. 



Cruise of the steam yacht Wild 



Duck in the Bahamas, January to April, 

 1893, in charge of Alexander Agassiz. 

 Notes on the shells collected. 



B^ill. Mus. Comp. Zool., xxv. No. 9, Oct., 

 1894, pp. 113-124, with plate. 

 This paper consists of a set of notes on a 

 small lot of material sent to the Smithsonian 

 Institution some years ago by Dr. J. J. Brown, 

 of Sheboygan, Wis., from "Watling Island, 

 Bahamas; another small lot from the same 

 place, collected by the U. S. Fish Commission, 

 and a third lot collected by Dr. Alexander 

 Agassiz. The lagoon species are pecuHarly 

 thin, small in size, and, when colored, quite 

 brilliant. Notes are given on 12 juarine and 

 Ifi land species and varieties, of wliicli 5 are 

 new. The genus Oerion (formerly called Stro- 

 phia) is divided into subgenera founded on 

 characters of the internal laniinaj. 



Description of a new species of 



Doridium from Puget Sound. 



Nautilus, vni, No. 7, Nov., 1894, pp. 73-74. 

 A description of an interesting new Dorid- 

 ium (D. adellce, Dall). 



How I came to be a paleontologist. 



Outdoor World, v, No. 11, Nov., 1894, pp. 

 335-336. 

 A brief autobiographical note with portrait. 



The mechanical cause o'f the fohls in 



the aperture of the shell of Gastropoda. 



Am. Naturaliat, xxvni, Nov., 1894, pp. 

 909-914, figs. 1-3. 

 Adapted from the Transactions of the Wag- 



DALL, William Healey — Continued. 



ner "Free Institutoof Science, ni, 1890, p. 58. Mr. 

 Dall shows that in those Gastropods which 

 have plicate apertures the adductor muscle, 

 which is attached to the columella, is placed 

 deeper within the shell than in the non-plicate 

 forms ; that in such cases the body of the ani- 

 Tual covered with its mantle is compressed as 

 it is being drawn into the shell and therefore 

 longitudinal wrinkles are formed in themantle. 

 The secreting surfaces deposit shelly material, 

 which, in the folds, takes the form of ridges in 

 the aperture of the shell. 



A new Chiton from California. 



Nautilus, vni, No. 8, Dec, 1894, pp. 90-91. 

 A description of a new Chiton (Lepidoplcu- 

 ruspererassuK, Dall) . In this species the girdle 

 is extended in such a manner as to partly sepa- 

 rate the shelly portions of the valves. Por 

 this peculiar form is proposed a section Old- 

 roydia. 



On a new species of Holospira from 



Texas. 



Nautilus, vni. No. 10, Feb., 1895, p. 112. 

 A description of a new Holospira {H. pasonis, 

 Dall), from El Paso County, Tex. 



Contributions to the Tertiary fauna 



of Florida, with especial reference to 

 the Miocene silex beds of Tam})a and 

 the Caloosahatchie River. Part iii. — 

 A new classification of the Pelecypoda. 



Trans. Wagner Free Inst. Sci., lu, pt. ni, 

 Mar., 1895, pp. 483-570. 

 The author in 1889, in a "Catalogue of the 

 .shell-bearing mollusks of the southeastern 

 United States, " proposed a new clas.siflcation 

 of the Pelecypoda. This paper is an amplifi- 

 cation of that work, bringing it down to the 

 present date, but conforming to the general 

 principles on which the eai'lier classification 

 was founded. In this system the shell, the 

 anatomy, the embryology, and evidence from 

 all sources are considered and made use of. A 

 brief dissertation on the shell, anatomy, and 

 functions of the Pelecypoda is given. Then 

 follows an enumeration of the orders, subor- 

 ders, superfamilies, and families of the Pele- 

 cypoda, each of which is differentially defined 

 in a manner enabling a direct comparison to 

 be made between groups of the same rank. 

 Under each family is given its range in geo 

 logical time and a list of the principal genera 

 believed to be referable to it. Some notes on 

 the principles of nomenclature applied in the 

 work and an index to the genera are appended. 

 The importance of this paper lies in the revi- 

 sion of the diagnostic characters, which are 

 endeavored to bo made strictly comparable in 

 the different groups, and when common to a 

 larger group are not repeated in the definitions 

 of its subordinate divisions ; and in the bring- 

 ing up to date of the data employed. 



