| Measurements | D mm | H/D | T/D | O/D | H/T |
|---|---|---|---|---|---|
| Holotype | 53 | 0.42 | 0.52 | 0.32 | 0.81 |
| CP-551 | 59.3 | 0.45 | 0.55 | 0.32 | 0.82 |
| Age | Origin |
|---|---|
|
Equivalent of Courcelles bed E Top of the dentatus zone Grey clay, Middle Albian |
Meuse France |
| Var. | vectensis | persulcatus | dentatiformis | rudis | maritimus |
|---|---|---|---|---|---|
| H/T | 1.54 | 1.28-1.29 | 0.97-1.03 | 0.78-0.91 | 0.69-0.81 |
| T/D | 0.28 | 0.35-0.36 | 0.39-0.40 | 0.44-0.54 | 0.52-0.59 |
Description. A reworked half-whorl in black phosphate, with a single well-preserved flank and a thick, depressed hexagonal ection. The umbilicus is fairly wide, but only its edge is visible. Seven primary ribs originate in the umbilicus and rise to form on its edge very tall, flattened umbilical tubercles with a triangular profile. A secondary rib, projecting far forward, begins at the top of each tubercle. Another originates lower down, on the rear of the tubercle. It is initially retroverted and then also curves forward. The last three secondary ribs of this type detach from their tubercles. The terminations of secondary ribs reach a 60° angle to the siphonal line. They rise strongly and become less projected forward, to form flat, thin, rounded-triangular spatulae (see the enlarged photograph on the right). They alternate on either side of the siphon and delimit a wide and very deep groove with a flared U-shaped cross-section.
Remarks. Personal discovery. Species defined by Owen for very thick forms with a wide groove and very strong ornamentation, with protruding, spiny or radially pinched umbilical tubercles, and spatulate rib terminations. Amédro (1992) and Amédro et al. (2014) consider it the thickest variant of H. (H.) rudis. We follow their opinion but with a small objection: H. (H.) rudis is found in the upper part of dentatus zone, whereas Owen writes that maritimus exists throughout the dentatus zone and even, more rarely, in the lyelli subzone of the underlying benettianus zone. The Ricordeau collection at the Auxerre Museum includes a specimen with enormous spatulae from Hauterive, Yonne (no. 2017.0-66). Two other specimens from the bed I of Folkestone can be seen on the website of Jim Craig.