1894. 



PROCEEDINGS OF THE NATIONAL MUSEUM. 105 



stances attains the length of an inch and is quite variable in form, as 

 are all these small Mulinias. It is my opinion that a complete geo- 

 graphical series will show that M. guadelwpensis is merely a well- 

 grown local race of the M. lateralis. Both have a preference for brackish 

 water. 



GNATHODON? VALDEN8I.S, Danker. 



(inathodon valdensis, Dunker, Moiiog. Nonldeutsch. Wealdeiibild., p. .57, t:if. xiii, 

 Figs. 5 a-e, 1846. — Sandbekger, Land iind Siisswasser coacLyl. der Vorwelt, 

 p. 54, PI. II, Figs. 10, 10a, 1870. 



Wiilderthon des Gravinghagener stoUeus bei Bielefeld, Germany; 

 Wealden formation of North Germany. 



This species has the aspect of a Cyrena. The interior and hinge are 

 unknown. It was referred to Gnathodnu by Dunker because the speci- 

 mens give no evidence of an external ligament. It is highly improba- 

 ble that the shell will Anally prove to belong to Gnathodon, both on 

 account of its age and its locality, but it will certainly be a matter of 

 interest to determine its proper place and it is to be hoped that this 

 will soon l)e accomplished. 



SPISULAf QUADRICENTENNIALI8, Harris. 



Gnathodou , new sp., Harris, p'onrtli Ann. Rep. Texas Geol. Survey, Table of 



species Galveston well, 1893. 

 Gnathodon quadricentenniaVis. Harris, Fifth Ann. Kep. Texas Geol. Survey. 



[In press]. 



From the upper Miocene, lilOO to 2250 feet, in the Galveston arte- 

 sian ^vell, Galveston, Te.xas; State Geological Survey. 



After a careful examination of specimens of this species kindly fur- 

 nished by Prof. Harris, I am inclined to refer this to Spisula, notwith- 

 standing the inequality of the lateral teeth. The ligament appears to 

 have been partly external, which would remove the species from Gna- 

 thodon, unless this feature is due to wear, which seems unlikely. The 

 shell is nearly smooth externally, rather elongated, evenly rounded at 

 each end, quite inequilateral, the longer posterior part having long 

 curved laterals, transversely striated. The hinge seems otherwise like 

 that of Spisula; the pallial sinus is well marked, the beaks adjacent, 

 low, and inconspicuous, 1.5 mm. from the anterior end. Lon. 8.5, alt. 

 5.0, diam. 4.0 mm. 



MULINIA MINOR, Whitfield? 



Rangiaf (Perissodon) minor, Whitfield, Moll, and Crust, of the Miocene form 

 of N. J., p. 84, pi. 15, tigs. 4-6 [in press] ; not of Conrad. 



Miocene marl of Shiloh, N. J., Burns. 



This species doubtfully referred to Conrad's R. minor [= G. clath- 

 rodon, jr.], and well figured by Prof. Whitfield, is a young Muliuia 

 allied to M. lateralis., l)ut too young to identify. The type is in the col- 

 lection of the National Museum. Only one specimen was obtained by 

 Air. Burns. 



