BALL: MOLLUSCA AND BRACHIOPODA. 285 



west longitude 126° 57 ; in 2368 fathoms, ooze, bottom temperature 34°. 6 F. 

 U. S. N. Mus. 110,751. 



The animal has a distinct subcylindrical muzzle, slightly expanded distally, into 

 which tlie proboscis is withdrawn ; the tentacles are rather posterior, small, short, 

 and subcylindric; there are no eyes and no operculum. The foot is short and 

 blunt behind, double edged at the front margin which is straight ; the verge is 

 small, coiled in a loose turn and laid back, the extremity with a lateral point; the 

 si])hou is thick and separate from tlie mantle-edge, without appendages ; there is a 

 moderately long retractile proboscis and a poison gland. The teeth of the radula 

 are very like those of Pleurotomella packardi as figured by Verrill, there are two 

 rows of about forty teeth each. The exterior of the animal is whitish throughout. 



Pleurotomella (Phymorhynchus? ) clarinda Dall, n. sp. 



Plate 1, figure 3. 



Shell white, with a pale yellowish periostracum, thin, fusiform, six whorled ; 

 whorls rounded, flattened a little over the anal fasciole in front of the suture, 

 which is very distinct but not channelled ; nuclear whorls eroded ; subsequent 

 whorls, with between the suture and the shoulder five or six fine, sharp, spiral 

 tlireads with wider interspaces, which are not beaded by the concavely arcuate 

 growth lines which are prominent on the fasciole ; at the shoulder is a weak 

 spiral ridge, followed by five stronger ones, subequal and equidistant with wider 

 interspaces; on a sixth similar ridge the suture is wound, followed by, on the 

 base, about thirty similar but less prominent ridges which gradually diminish in 

 size and strength, and approximate more closely to each other until the canal is 

 reached ; over all these ridges and interspaces fine sharp threads run spirally, as 

 on the fasciole and are perhaps a little more prominent on the ridges, where they 

 are rendered more or less scabrous by the elevated lines of growth ; outer lip thin 

 with a shallow rounded excavation, near the suture, which forms the anal sulcus; 

 body polished, with the spiral sculpture erased; pillar thin, gyrate, pervious, 

 white, with a slightly thickened edge ; canal short, wide, slightly recurved. Lou. 

 39 ; last whorl, 30 ; aperture, 22 ; max. diam. 18 mm. 



U. S. S. "Albatross," station 3381, east of Malpelo Island, Panama Bay, in 

 1772 fathoms, mud, bottom temperature 35°.8 F. U. S. N. Mus. 123,097. 



Tlie form and sculpture of this species have a general resemblance to those of 

 the preceding two species, although the cohir is wholly different and iu the 

 absence of the soft parts it is provisionally placed with them. 



MAKGILI.l Risso. 

 Mangilia mo villa 1>ai,i,, n. sp. 



Pliitc 14, t1|;ur« 0. 



Shell small, thin, white, fusiform, witli about five whorls beside the (eroded) 

 nucleus; suture distinct, slightly apprcssed ; anal fasciole narrow, nearly smooth 



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