'2(^2 «AI,IFOUNlA A( Ani;MV OK SCIKNCKS. 



Sulijiiiius Leucosyrinx Ihill. 



167. Pleurotoma (Leucosyrinx) pedroana, s|). nov. 

 I'LATK IX, Fi<i. 4. 



ShfU -sin.ill, elongated; apex subacute; whorls six, sl):iri)ly angulatcil near anterior margin; 

 upper portion ofwiiorls flat; ornamentation consists simply of incremental lines, which are angulated 

 convexly posteriorly a little posterior to the angle of the whorl; lower portion of body-whorl, and 

 sometimes the lower portion of the upper whorls, faintly s|)irally ribbed; deep sutural canal; aperture 

 ovate; outer lip thin, bulging anteriorly; inner lip smooth; posterior rims shallow and wide; canal 

 long, narrow; columella slightly recurved. 



Dimetisiotis. — Long. 17 nun.; lat. 6 mm.; body-whurl 10 mm.; aperture 7 mm.; defi. 

 22 degrees. 



Distinguishable by the deep, canal-like suture and the i)roniincnce of the 

 anjjidation on the lower part of the whorls. Specimens identified by Dr. Dall as 

 being new. 



Rare in lower San Pedro series at Deadman Island; three specimens found. 

 The specimen figured is the type, which is from the lower San Pedro series at Dead- 

 man Island, and is now in the United States National Museum. 



Pleistocene. — San Pedro (Arnold). 



Subgenus Genota Admns. 



Section Dolichotoma Bellardi. 

 Shell mitriieform; whorls finely cancellated; aperture elongated, canal short; sinus profound. 

 Pleurotoma mitrceformis Kiener is a characteristic species. 



168. Pleurotoma (Dolichotoma) carpenteriana Gahh. 



Pleurotoma (Surcula) carpenteriana Gabb, Proc. Cal. Acad, Sci., Vol. Ill, 1865, p. 183; Pal. Cal., 

 Vol. ILpp. 5.72, PI. I, fig. 8, 1869. 



Surnila carpenteriana Gabb, Trvon, Man. Conch., Vol. VI, p. 239, PI. VII, fig. 3, 1884. Cooper, 

 7th Ann. Rept. Cal. vSt. Min., 1888, p. 266. Keep, We.st Coast Shells, p. 57, 

 fig. 41, 1892. 



Genota carpc7iteriana Gabb, Dai.i,, Proc. U. S. Nat. Mus., Vol. XII, 18.S9, p. 303. 



Pleurotoma (Dolichotoma) carpenteriana CpR., Williamson, Proc. U. S. Nat. Mus., Vol. XV, 

 1892, p. 207. 



Siiell large, fusiform; spire elevated and about as long as ihe aperture; whorls eight, sub- 

 flattened on the sides, slightly concave near suture, and very slightly convex anteriorly; surface 

 ornamented with fine spiral ridges, which alternate in size on lower part of body-whorl; suture im- 

 pressed; a|)crtiire narrow, widest in luiddle; outer lip thin, arcuate anteriorly below the wide, shallow 

 sinus; inner lip smooth, incrusted; canal broad and short. 



Dimensions. — Long. 88 miu.; lat. 33 mm.; body-whorl 66 mm.; aperture, including canal, 

 50 mm.; defl. 38 degrees. 



The specimen described is an exceedingly fine speeimeii, a little above the 

 average in size. Mrs. Oldroyd has over a dozen fine specimens of the living shells 

 of this species, which have been hauled up in the fishermen's nets at San Pedro. 



