SALPINGOSTOMA MULTIRUGATUM. 77 



3. Salpingostoma etheridgei, sp. nov. Plate XII, fig-. 4. 



Specific Characters. — Shell large, of '2 — 3 whorls in contact and slightly over- 

 lapping, rapidly increasing in height and more gradually in width, weakly carinate, 

 subelliptical in section ; sides convex, rounded, without umbilical edge. Umbilicus 

 large, open ; centre situated at less than one-third height of shell. Mouth rather 

 suddenly expanded, more than three-fourths the height of shell ; inner lip reflexed 

 on to second whorl. Slit-band well marked, narrow, situated on low keel, with 

 raised edges and distinct on inner portion of outer whorl, but becoming closed and 

 represented only by sharp carination in outer three-fourths of whorl. Surface of 

 shell smooth. 



Dimensions.— Height of shell about 55'0 mm.; width of outer whorl near 

 mouth about 28 mm. 



Horizon. — Stinchar Limestone Group, Lower Ordovician. 



Locality. — Craighead, Girvan. 



Remarks. — -The two species which most resemble it seem to be Salp megalostoma 

 (Eichw.) 1 from the Russian Orthoceras Limestone and 8. compressum (Eichw.) 2 from 

 Stage C. Our 8alp. buccinoideum differs by having less regularly swollen sides, a 

 sublanceolate instead of subcircular transverse section, a decided umbilical edge, 

 a more acute dorsal carination and a free inner lip. The type of this species is in 

 Mrs. Gray's Collection. 



4. Salpingostoma multirugatum (Reed). 



1906. Bellerophon .' m/uMirugatus, Reed, Greol. Mag. [5], vol. iii, p. 365, pi. xx, figs. 11, 11 a. 



Specific Characters. — Shell with outer whorl rounded, rapidly enlarging 

 towards mouth and embracing (?) inner whorls; dorsum broad, rounded, with low 

 distinct narrow carina. Mouth transversely expanded with reflexed lip. Shell 

 crossed by regularly arranged strong low rounded subequal broad transverse ribs, 

 closely placed, separated by grooves of nearly equal width, curving back in a broad 

 V of about 150° over the keel without interruption, but dying out on the margins 

 of the mouth and becoming weaker on the umbilical slopes of the whorls; surface 

 of ribs crossed by delicate fine revolving equidistant strise parallel to the keel, but 

 becoming sinuous, broken and irregular near the mouth. 



Horizon. — Redhill Beds, Upper Ordovician. 



Localities. — Prendergast Place ; Mill Lane, Haverfordwest. 



Remarks. — The original specimen on which this species was founded came 



1 Eichwald, ' Leth. Ross.,' vol. i, pt. 2, p. 1069, pi. xli, figs. 5 a — c ; Koken, 'Neues Jahrb. f. Miner.,' 

 Beil. Bd. vi (1889), p. 384, pi. xiii, figs. 6, 9, 9 a ; idem., ' Gastrop. Bait. Untersilur.' (1897), p. 134. 



2 Eichwald, ibid,, p. 1068, pi. xli, fig. 9. 



