Clark: The San Lorenzo Series of Middle California 189 



Genus SCAPHANDER Montfort 

 SCAPHANDER sp. 

 Several poorly preserved specimens of a species of Scaphander 

 were found at University of California locality 2033, in the tuff mem- 

 ber of the Kirker formation. These are generically but not speci- 

 fically determinable. 



Family Turritidae 

 Genus TURRIS Bolten 

 TURRIS ALTUSCOLLUS, n. sp. 

 Plate 23, figure 1 

 Type specimen 11232, Coll. Invert. Palae. Univ. Calif., loc. 1131. 



Shell fusiform, medium in size; spire high, acute, with five or six whorls; apex 

 broken on all specimens observed. Sutures strongly appressed, the upper part 

 of each whorl being appressed into a fairly broad, distinct collar. Surface 

 sculptured by numerous spiral, granular ribs and riblets ; on whorls of spire 

 there are nine or ten, and on body whorl about twenty-five to twenty-eight of the 

 spiral ribs. On body whorl there are three spiral riblets in each interspace, 

 two of which are situated up close to the sides of the ribs and one in the 

 middle of the interspace; on the whorls of the spire, only the medium riblet is 

 distinct. Surface of whorls also sculptured by ten or eleven elongate, rounded 

 nodes ; on the whorls of the spire these begin just below the depressed area of 

 the collar extending to the suture below; on the body whorl, they extend only 

 a little below the line of greatest convexity. Aperture elongate-ovate ; outer 

 lip thin ; inner lip rather heavily incrusted ; lower end of canal broken. 



So far only one specimen of this species has been obtained. 



Occurrence. — University of California locality 1131. 



TURRIS (PLEUROTOMA) NOMLANDI, n. sp. 



Plate 21, figure 7 



Type specimen 11275, Coll. Invert. Palae. Univ. Calif., loc. 3055 



Shell fairly large for this genus, fusiform ; spire acute ; sutures rather strongly 

 appressed ; number of whorls six. Surface covered by numerous fine spiral ribs 

 which are somewhat irregular in prominence, the interspaces averaging less than 

 the width of the ribs; on the body whorl there is a tendency for every other 

 spiral rib to be heavier than the one between ; on the penultimate whorl twelve, 

 and on the body whorl over thirty of the spiral ribs. Surface also sculptured by 

 nine or ten prominent, rounded longitudinal ribs; these are indistinct on the 

 appressed area just below the suture, but on the whorls of the spire they extend 

 to the suture below, being the most prominent near the middle of the whorl ; on 

 the body whorl, just below the appressed area, they become so prominent as to 

 form fairly distinct nodes, giving this portion of the shell a subangulate appear- 

 ance. The sides of the whorl slope very rapidly and evenly from this line of 

 subangulation down almost to the anterior end. Canal straight, short ; aperture 

 not exposed. 



