ART. 18 SMALL SHELLS DREDGED BY " ALBATROSS '' DALL 31 



Daphnella limacina Verrill, Trans. Conn. Acad., vol. 5, p. 452, 1882; vol. 



6, p. 265, 1884. 

 Daphnella (Eubela) limacina Dall, Bull. Mas. Comp. Zool., vol. 18, p. 106, 



pi. 9, fig. 10, June, 1889; U. S. Nat. Mus. Bull. 37, p. 100, pi. 9, fig. 10, 



1889. 



Six specimens off Fernandina. Also in deep water from off Mar- 

 thas Vineyard, Mass., to the South Atlantic off Pernambuco, Brazil, 

 in from 85 to 805 fathoms. 



SPECIES WITH A SWIMMING LARVAL STAGE AND THE NEPIONIC WHORLS FOLLOWED BY A TRANSITIONAL 



ARCUATELY RIBBED WHORL 



MANGILIA (TURRIDRUPA) COMATOTROPIS Dall 



Pleurotoma (Mangilia) comatotropis Dall, Mus. Comp. Zool., vol. 9, p. 58, 



Aug. 1881. 

 Pleurotoma (Mangilia) tiara Watson, Linn. Soc. Journ., vol 10, p. 440, Oct., 



1881; Challenger Gastropods, p. 347, pi. 21, fig. 7, 1885. 

 Pleurotoma comatotropis Verrill, Trans. Conn. Acad., vol. 5, p. 452. 

 Taranis pulchella Verrill, Trans. Conn. Acad., vol. 5, p. 487, pi. 57, fig. 17 



(young) June, 1882; vol. 6, p. 267, pi. 29, fig. 8, 1884. 

 Mangilia comatotropis Dall, Bull. Mus. Comp. Zool., vol. 18 p. 116, pi. 11, 



fig. 12, 1889; Bull. 37, U. S. Nat. Mus., p. 102, pi. 11, fig. 12, 1889. 



Numerous specimens off Georgia and Fernandina. 

 This has the general form of AstJienotoma cicatrigula Hedley, and 

 the nucleus of Turridrupa pertinax Hedley, both AustraUan forms. 



SPECIES WITH A SWIMMIMG LARVAL STAGE AND SINUSIGERA NUCLEUS WITH A PERIPHERAL KEEL 



PLEUROTOMELLA? LINEOLA, new species 



Shell small, thin, white, with a Sinusigera nucleus of two and a half 

 brown whorls and three and a half subsequent well rounded whorls; 

 suture closely appressed, somewhat constricted; anal sulcus deep and 

 wide, the fasciole close to the suture, crossed by retractively arcuate 

 wrinkles; axial sculpture of about 16 very narrow sharp ribs, with 

 much wider interspaces, completely crossing the whorls except the 

 anal fasciole; spiral sculpture of (on the last whorl 6) slender threads 

 with much wider interspaces, so that the interstices of the reticulation 

 are nearly square; the canal is finely spirally threaded; pillar short, 

 straight, attenuate in front, gyrate, with pervious axis; aperture nar- 

 row, outer lip thin, arcuately produced in front. Length, 5.5; diam- 

 eter, 2.25 mm. U. S. Nat. Mus. Cat. No. 333529. 



Three specimens off Fernandina. 



This species has nucleus markedly spirally unicarinate, while in 

 most of the species with the Sinusigera nucleus the whorls are 

 rounded. 



SPECIES WITH A SWIMMING LARVAL STAGE AND WITH THE NEPIONIC SHELL SPIRALLY KEELED AND THE 



AXIAL SCULPTURE STRONG 



MANGILIA ISCHNA, new species 



Shell minute, glassy white, slender, acute, with a four-whorled 

 brown nucleus in which the nepionic part is prominently peripherally 



