124 
ANNELIDES, ETC. 
Another species occurs in the Sussex chalk, and 
appears to be more generally distributed than the 
former. The chelate hand-claws are shorter, and 
the surface both of the claws and pincers is spirous ; 
the latter are slightly curved, and armed with a 
row of obtuse tubercles. I have named it As- 
tacus SusseAensis. On the remains of this species 
M. Dasmarest has the following observations : — 
“ Le crustace auquel appartenaient ces pinces, 
avoit la forme ordinaire des macroures, et ne pre- 
sentait sur les pieces que nous avons vues, d’autres 
caracteres exterieurs que ceux qui consistaient 
dans la presence de trois fort tubercules sur 
chaque cote de la carapace qui etait d’ailleurs tres- 
rugueuse. II etait un peu plus grand que f ecre- 
visse fluviatile.” * 
A chelate hand-claw is represented above 
ANNELIDES, CONCHIFERA, MOLLUSCA, ETC. 
The remains of the testaceous coverings and in- 
struments of locomotion of the mollusca of the 
chalk are so very numerous, that we can notice 
but a few, and must refer to the catalogue for an 
enumeration of the various species. Among the 
most remarkable of the simple spiral shells are the 
two species of Cirrus, figured a, Cirrus depressusy 
h, c. Cirrus perspectirus : they are diminished 
five-sixths. 
* Crustaces Fossilcs, p.l37. The learned autliors describe, under 
the name of Scyllarns ManlcUi, tlie remains of a crustaceous animal 
found on the coast of England, but do not mention its geological site. 
