MUSEUM OF COMPARATIVE ZOOLOGY. 115 



sha^ecncd ; faaciole wide, smooth except for faint arched incremental lines, ex- 

 cavated, extending from the appresscd suture to the an[,dc of the whorls ; spiral 

 ficulpture of slender elevated threads, tending to run in pairs, with wide inter- 

 spaces, and extending from the fasciole to the suture in front ; there are five 

 or six on the whorl next to the last and 20-22 on the last whorl including the 

 canal; these, without becoming swollen, run over (on the last whorl 16) nu- 

 merous oblique riblets, beginning at the angle of the whorls where they are 

 largest, crossing the whorl and becoming obsolete on the base ; mouth rather 

 narrow, outer lip thin, arched ; notch at the suture moderately deep, rounded ; 

 inner lip slightly excavated, pillar straight, attenuated in front ; canal short, 

 slightly twisted. Lon. of shell, 17.0; of last whorl, 11.0; of aperture, 7.0; 

 max. lat. of shell, 6.8 mm. 



Habitat. Station 136, near Santa Cruz, in 508 fras., ooze, temperature 

 42°.5 F. 



This looks a little like a Drillia not mature, but from the character of its 

 surface is probably allied to the preceding species. 



Mangilia ? ipara Dall. 



Plate XI. Fig. 14. 



Pleurotoma (Mangiliaf) ipara Dall, Bull. M. C. Z., IX. p. 57, August, 1881. 



Habitat. Yucatan Strait, 640 fms. ; Station 195, near Martinique, a frag- 

 ment, in 502 fms. 



Mangilia ? peripla Dall. 



Plate XI. Fig. 17. 



Pleurotoma (Drillia) peripla Dall, Bull. M. C. Z., IX. p. 68, August, 1881. 

 Pleurotoma (Defrancia) chyta Watson, Journ. Linn. Soc, XV. p. 466, Nov., 1881. 

 Chall. Gastr., p. 358, pi. xviii. fig. 4, 1885. 



Habitat. Yucatan Strait, 640 fms. 



As observed elsewhere, this species is very closely related to elusiva. The 

 spiral sculpture is equally composed of two sets of threads, a coarse and a fine 

 series. M. ipara and its connections have only one kind of spirals, but in. 

 other respects they approach 'peripla, etc. very nearly. 



Mangilia ? elusiva Dall. 



Plate XII. Fig. 7. 



Pleurotoma {Drillia) elusiva Dall, Bull. M. C Z., IX. p. 69, August, 1881. 

 ? Pleurotoma (Defrancia) perpauxilla Watson, Linn. Soc. Journ., XV. p. 468, Nov., 

 1881. Chall. Gastr., p. 359, pi. xxii. fig. 7, 1885. 



Habitat. Yucatan Strait, 640 fms. Off Culebra Island, in 390 fms., Chal- 

 lenger Expedition. 



