SHELLS OF THE LOWER LUDLOW ROCK. 621 



it thought necessary to establish a distinct genus, we might perhaps name it Gomphoceras, 

 from its club-like form 1 . 



Loc. Leintwardine Hill, near Aymestry ; also Ledbury in Wenlock Limestone. 

 Cyrtoceras Iceve, PI. 8. f. 21. Also in Upper Ludlow Rock, PL 5. f. 34. (For the generic description 

 of Cyrtoceras see Goldfuss.) Elongated, pointed, curved into a semicircle, smooth or only 

 marked with lines, of growth ; generally compressed ; we have not seen the septa. Length 

 1% inch, diameter of aperture 7 lines. 



This strongly resembles Hortolus convolvens of Steininger, {Mem. de la Soc. Geol. de France, 

 vol. i. p. 370. t. xxiii. f. 3.) but has a more even surface. 

 Loc. Abberley. 



Phragmoceras (Broderip) . {^pd^fxa or (f>pa<yfib<;, septum, /cepas, cornu.) Gen. Char. Shell in- 

 curved and compressed, more or less conical ; septa entire at their edges, crossed externally by 

 the lines of growth ; siphuncle near the inner margin ; aperture contracted at the middle, its 

 outer extremity produced into a subcylindrical beak. 



A genus distinguished from Orthoceras by being curved and having a nearly marginal si- 

 phuncle; also from all the species of that genus, except O.pyriforme, by the form of the aperture, 

 which further distinguishes it from Cyrtoceras of Goldfuss, the aperture of which is round. 



Phragmoceras arcuatum, PL 10. f. la. Slightly arched, gibbose, elongated; surface even; siphuncle 

 broad, beak direct? the lines of growth are sharply marked; length 2| inches. Length of 

 aperture If inch. 



Around the edge of the last septum is a series of furrows indicating a thickening of the shell 

 about the base of the last chamber ; similar furrows, but longer, occur upon the only specimen 

 we have seen of Orthoceras inflatum from the Eifel. 

 Loc. Ludlow escarpments, and near Ledbury. 



/3. PL 11. f. 1. Rather more elongated than var. a. Length 2| inches; length of aper- 

 ture lj inch. 



Loc. Shelderton Hill, near Ludlow. 

 Phragmoceras ventricosum, PL 10. f. 4, 5, 6. ( Orthoceratites ventricosus ? Steininger, Mem. de la Soc. 

 Geol. de France, vol. i. p. 368. t. xxii. f. 5.) Slightly arched, hooked near the apex, compressed ; 

 surface marked with numerous ridges which cross the edges of the numerous septa ; aperture 

 nearly closed in the middle, beak produced. Length 6 inches ; length of aperture 4 inches. 



This is the largest species of the genus ; we have not been so fortunate as to detect the si- 

 phuncle. F. 4. represents a nearly entire shell; f. 5. is a view of the aperture of a specimen 

 which has been depressed so as to bring the lips nearer in the middle than the natural position ; 

 f. 6. is from a specimen which has the beak nearly perfect. If the fossil described by Steinin- 

 ger be the same as our species, the artist has apparently reversed the curve of the septa. 

 Loc. Leintwardine Hill, Gardenhouse Quarry, Aymestry ; also from the Western flank of the 

 Malverns ; Dudley. 



Phragmoceras compressum, PL 11. f. 2. Much curved, elongated and compressed; marked with 

 distant lines of growth ; this is so much curved as to form nearly a circular hook. Longest di- 

 ameter 3 inches ; length of aperture 1 ^ inch. 

 Loc. Near Aymestry. 



1 I am indebted to Mr. Proctor, Surgeon, of Leintwardine, for several Orthoceratites, and particularly 

 for one of the most illustrative specimens (f. 20.), which best shows the sudden diminution of the inflated 

 portion towards the apex. 



4 K 



