fi84 DEEP WATER MOLLUSES AND BRACHIO PODS— D ALL. vol.xvii. 



rounded than tbe young of the other, and has none of its cylindrical 

 appearance. 



The soft parts resembled those of >S^. glandiniformis, though the ros- 

 tral disk was less conspicuous, but the eyes were very large and black, 

 and the tentacles placed low on the side of the head, as in that species. 

 The angles of the anterior edge of the foot were markedly produced. 



It seems not unlikely that Daphnella Umacina, Dall {Pleurotoma 

 {Defrancia) hormojyhora, Watson), from the deep water of the North 

 Atlantic, may be referable to the subgenus Spergo, as there is much sim- 

 ilarity in many of the conchological characters, as well as the absence 

 of an operculum and the presence of eyes. 



Genus POLY NICE S, Montfort. 



Subgenus Lunatia, Gray. 



LUNATIA SANDWICIIENSIS, new species. 



Plate XXVI, fig. 8. 



Shell small, thin, white, with a thin straw-colored epidennis and 

 about five whorls; surface polished, with faint spiral markings and tine 

 delicate lines of growth, which, between the shoulder of the whorl and 

 the suture behind it, are irregularly elevated into fine, sharp, oblique 

 wrinkles; suture appressed with a faint spiral impression in front of it; 

 form recalling in miniature that of Natica russa, Gould, or iV. clausa, 

 Broderip; whorls well rounded, slightly flattened in front of the suture; 

 aperture with a moderate callus on the body reaching, but not obscur- 

 ing, a narrow deep umbilicus. Height of shell, 15.7 ; maximum diameter, 

 15 mm. 



Station 3476, in 298 fathoms, one dead specimen. No. 107017, 

 U.S.N.M. 



Though this modest little species has no very marked characters, I 

 have compared it with all our deep-water species described or inedited, 

 and find none with which it can be united. The wrinkles are an inter- 

 esting feature, as they recall the grooves or wrinkles so frequently 

 found on typical S])ecies of ]S\iUca; but the umbilical characters show 

 that it must be referred to Lunatia, in the vi(;inity of L. gronlandica. 



Genus MARGARITA, Leach. 



Subgenus Solariklla, A. Adams. 



SOLAKIELLA RETICULINA, new species. 



Plate XXVI, fig. 9. 



. Shell thin, frosted -pearly white; depressed-conic, with a (lost) nucleus 

 and five subsequent whorls; suture inconspicuous, appressed, undu- 

 lated by the sculpture of the whorl upon wliich it is apjilied; sculpture 

 of the spire very uniform, spiral sculpture of (on the upper whorls two or 

 three and on the last whorl five) sharp, narrow, spiral ridges increasing 



