4 
Gen. Helmintholithus, Fam. StylistritjE. 
annulalus. 
another Entrochite, which resembles it, in having each joint marked with a single row of tuber- 
cles, but differs in the form of the tubercles, which are more spine-like, and somewhat incurved. 
I do not propose this latter, however, as a mere variety of verrucostM, having little doubt of its 
proving a distinct species. 
4. Helm. Styl. EntrochJtes stipitis articulis insequalibus : ambitibus Isevibus 
caput versus alterne planis convexisque, ramis ? 
Tab. 4. Fig. 11, 12. 
Varielates, 
a. V. articulis iongiorlbus stipitis convexis regularibus. Tab. 4. Fig 11. 
— — ■ — planis regularibus. Tab. 4. 12 . 
' ' ' — — convexis irregularibus. 
Ring-joinicd Entrochite. 
Secies: strata vetusta, calcaria. 
In most parts of the county where limestone occurs. 
SPECIMINA. 
a. S. stipitis ramis destituti. 
b. S. stipitis foramine simplici rotunda. 
c. S. stipitis foramine quinquepartita. 
d. S. articulorum disjunctorum. 
c. S. stipitis articulis troclilearibus. Nucleus. 
Ous. Nearly as common as H. E. luvU, with which it is frequently seen forming the white 
figures ,n our grey marlle Those produced by ar^nulalue are distinguishable by thL indented 
margms, caused by the alternately flat and round ambits of the joints ;_and by their pully-shaped 
rntermr structure, wh.ch d.ffers from that observable in sections of the eoen-joinua eLrocfifte, in 
angles of the joints being regularly divided into pairs, more or less distant, according to the 
Var. c. is distinguished from 
fourth being considerably larger, 
mediate ones of the same form, 
than a proper variety. 
a. by the unequal size of the round-edged joints— every third or 
and with the ambit more convex and prominent, than the inter- 
b. is rather, perhaps, the remains of the branches of this species, 
