322 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiii. 



TELLINA (PERONIDIA) LUTEA Gray. 

 (Plate IV, figs. 15, 16. ) 



Tellina lutea Gray, in Wood's Index Testaceologicns, Supplement, pi. 1, fig. 3c, 



1828; not of Krause. 

 Tellina gmldfordi.i' Gray, in Griffith's Cuvier, XII, pi. 19, fig. 2, 1834. 

 Tellina alicrnidentaia Broderip and Sowerby, Zool. Journ., IV, p. 363; Sowerby, 



Zoology of the voyage of the Blossom, Capt. Beechey, 1839, p. 153, pi. 44, fig. 5. 

 f Tellina venulosa Schrenck, Bull, de I'Acad. Imp. des Sci., 1861, p. 411; Anmrl. 



Moll., 1867, p. 556, pi. xxii, figs. 2-5. 



It seemed desirable that a good figure of this line shell should be 

 available, so one has been included. The specimen figured is No. 

 122562, U.S.N.M., collected at Bering Island by Governor Grebnitzki. 



MACOMA KRAUSEI new species. 

 (Plate IV, fig. 8.) 



Tellina lutea A. Krause, Archiv fiir Naturgeschichte, 1885, p. 37; not of Gray. 



Specimens obtained by Dr. Krause in the vicinity of Bering Strait, 

 and donated by him to the U. S. National Museum, were supposed to be 

 young specimens of Tellina lutea Gray. They prove, however, on 

 careful examination, to belong to an undescribed species of Macoimi., 

 which is represented in the U. S. National Museum from many locali- 

 ties in Bering Sea and the Arctic Ocean, including specimens from 

 both Greenland and Spitsbergen as well as the Alaskan waters. 



Shell of a nearly egg-oval outline, with Aery low beaks, situated at 

 the posterior third; valves not flattened Init only slightly convex, 

 marked with faint incremental sculpture and covered with an olive 

 green, usually polished periostracum; there is hardl}^ any posterior 

 flexure and no rostration; hinge normal, very delicate; pallial sinus 

 small rather low and reaching only about three-flfths of the distance 

 from the posterior end of the shell forward: mostly confluent below. 

 Lon. 23.5, alt. 14.5, diam. 5.7 mm. 



7}//;6s-.— No. 108606, U.S.N. M., collected in the Arctic Ocean north 

 of Bering Strait liy Capt. E. E. Smith, ofl' Icy Cape in 7 to 15 fathoms. 



The species has much the general appearance of Yoldia iiiyalis^ 

 though nearly of the color of Yoldia Ihnaiula. It difl'ers from Maeoma 

 caTlottensh Whiteaves in not being flattened, in its rounded posterior 

 end, and different color. When once recognized it is easily picked 

 out from the related species. The Greenland and Spitsbergen speci- 

 mens were referred to Maeoma iiiflata by Jefl'reys, but that .species is 

 proportionately much more inflated, more arcuate and flexuous, and 

 never reaches so large a size. It is named in honor of Dr. Arthur 

 Krause, who worked up the mollusks of his expedition to Alaska. 



