liinatus. 
lavis. 
2 Gen. Helmintholithus. Fam. Stylastrit^e. 
* c * A'lonoculitje. 
2. Ent. Monoculites? testa marginata antice subretusa, postice lunata, 
cauda recta : stylo elongato simplici. 
Tab. 45. Fig. 4. 
Lunated Monoculite. 
Sedes : strata vetula, argillacea, ssepe ferrifent. 
In ironstone, near Mansfield, Nottinghamshire — and, as we have lately 
been Informed, near Chesterfield. 
HELMINTHOLITHUS. 
* Familiee pcrmanentes. 
* c * Stylastritre Entrochita;. 
1. Helm. Styl. Entrochites stipitis articulis aequalibus : ambitibiis laevibus 
planis, ramis alternis articulatis. 
Tab. 2. Fig. 1, 2, 3, 4. Tab. 3. Fig. 5, 6, 7, 8. Tah. 24. Fig. 12. 
- Varietates. 
a. V. articulis brevibus, ramis crassis. Tab. 24. Fig. 1 . 
b. V. articulis longioribus, ramis tenuissimis. Tab. 2. Fig. 1 2. 
Even-jointed Entrochite. 
Sedes : strata vetusta, calcaria. 
In the grey-marble at Monyash — also in every part of the counT 
where limestone is found. 
SPECIMINA. 
a. S. corpore stipiteque conjunctis. 
b. S. stipitis disjunct!, ramis lateralibus. 
c. S. stipitis disjunct!, ramis destituti. 
d. S. stipitis disjunct!, foramine simplici rotunda minuta. 
e. S. stipitis disjunct!, foramine obsolete quinquepartita. 
