Gen. Helmintholithus. Fam. Stylastrit.e. 
3 
f. S. stipitis disjuncti, foramine simplici maxima. 
g. S. articulorum disjunctorum. Tab. 2. Fig. 2. 
h. S. stipitis articulis trochlearibus. Nucleus, 'lab. 2. Fig. i. 
i. S. tubulis centralibus nudis. Tab. 3. Fig. 5, 6. 
Obs. Specimens with the head and stipe united, as in a. are very rare in Derbyshire — I have 
never been fortunate enough to meet with them in this state myself, but have received a sketch, 
which was made from one, found in a block of marble at Ashford. Specimen b. — the stipe de- 
tached from the head or body, but furnished with branches, is the next more perfect form in 
which we find this fossil — The branches, however, seldom proceed from the stem above the 
length of three or four joints, before they are mutilated. Spec. d. in which the stipe is perfo- 
rated with a minute, round hole, is common. It is occasioned by the central tube alone remain- 
ing visible of the six, which constitute the medullary part of the joints ; those surrounding it, 
being filled up, and obliterated by the substance forming the petrifaction. Specimens similar to 
e. with the hole or foramen indistinctly five-parted, arise from the loss of all the tubes just 
mentioned. The large round hole in Spec. f. is produced by the loss or decay of the centre of 
the stem, as far as the circumference of the transverse plates, which connect the medullary tubes 
together (vide plate 3. fig. 6.) Specimens h. and i. are almost always foutrd in chert. 
2. Helm. Styl. Entrochites stipitis articulis ceejualibus ; ambitibus rotundo- 
convexis Irevibus, ramis alternis. 
Tab. 4. Fig. 9. 
Convex-jointed Entroch ite. 
Sedcs : strata vetusta, calcaria. 
Found with the foregoing. 
Obs. It has not yet been found united to the head: in other respects the specime7ts are similar 
to those enumerated of the Even-jointed Bntrochite. 
3. Helm. Styl. Entrochites stipitis articulis aequalibus ; ambitibus rotundo- 
convexis tuberculatis, ramis ? 
Tab. 4. Fig. 10. 
Warted Entrochite. 
Sedes : strata vetusta, calcaria. 
Rare, 
Obs. The specimen from which I took the figure above referred to, was found near Buleivell — 
I have since met with the fossil in a more perfect state, in the Ashford marble — together with 
promintns. 
xerritcosus. 
