DESCRIPTIONS OF NEW MARINE MOLLUSKS FROM 

 PANAMA, WITH A FIGURE OF THE GENOTYPE OF 

 ENGINA 



By Paul Bartsch 



Curator, Division of Mollusks and Cenozoic Invertebrates, United States 



National Museum 



Some time ago the United States National Museum received a send- 

 ing of marine shells collected by C. D. AUeman, on Taboga Island, 

 in the Gulf of Panama. Some of these made it necessary to subject 

 certain other collections in the possession of the National Museum 

 to critical examination, with the result that seven new species were 

 discovered, which are herein described. In addition to this, thanks 

 to the kind offices of Dr. Guy Robson, of the British Museum of 

 Natural History, I have been able to obtain a photograph of the 

 genotype of Engina, which I am here reproducing as Figure 6 of 

 Plate 1. The genus Evdaphne is also here defined as new. 



ANACHIS TABOGAENSIS, new species 



Plate 1, Figxjre 1 



The shell is small, elongate-ovate. The nuclear wheels are flesh- 

 colored; the rest marbled with chestnut-brown, pale-brown, orange, 

 and flesh-colored spots of irregular size and spacing. The inside of 

 the outer lip, except the denticles, is for the most part bright, dark 

 rust brown ; the denticles immediately behind its edge are yellowish 

 white. Nuclear whorls 3.6, well rounded, smooth, and separated by 

 a moderately impressed suture forming a rather conspicuous apex. 

 The postnuclear whorls are crossed by low, rather strong, slightly 

 protractively slanting axial ribs, of which 16 occur upon the first 

 and second, 18 upon the third, 20 upon the fourth and the last turn. 

 The spaces separating these axial ribs are less than half the width 

 of the ribs. In addition to the axial ribs the whorls are marked by 

 threadlike incremental lines, which are not closely crowded and 

 which are present on the ribs and intercostal spaces. The spiral 

 sculpture between the summit and the periphery consists of four 

 equal and equally spaced incised spiral lines, which pass over the 

 ribs and intercostal spaces and render the spaces between them on 

 the ribs weakly tuberculated. Periphery well rounded. Base well 



No. 2881.— Proceedings U. S. National Museum, Vol. 79, Art. 15 



59079^31 1 



