CLASS I. CRUSTACEA. 
83 
'’yes not thicker than their bending-backward peduncles: orbits above 
'vith one fissure. 
V i. Cor. cassivelaunus. Shell granulated, crenulated behind; front 
bifid ; the sides tridentate. 
kancer cassivelaunus. Penn. Brit. Zool. iv. 6. t. 7. male and female. 
Herbst, i. 195. f. 12. f. 72. male. Cancer personatus. Herbst, 193. 
l - 12. f 71 . female. Alburnea dentata. Fabr. Hupp. Bat. Syst. 398. 
Bose, Hist. Nat. des Crust, ii. 4. Corystes dentatus. Latr. Corystes 
cassivelaunus. Leach, Make. Podoph. Brit. t. 1. 
ahabits most of the sandy shores of the European ocean, and is often 
thrown up after heavy gales of wind. 
Genus 2. ATELECYCLTJS. Leach, Latreille. 
External antenna half the length of the body; the third segment com- 
posed of elongate and cylindric joints: external double palpi with the 
second j oint of the internal footstalk shortest, with the internal apex 
produced, and the internal side notched towards the joint : anterior 
tegs of the male longer than the body, with a compressed hand : 
other legs with tibite and tarsi of equal lengths, lumished with elon- 
gate, quadrate nails that are longitudinally snlcatcd, having their tips 
baked, rounded and sharp, the hinder ones obscurely subcompressed : 
abdomen of the male with the first joint transverse, linear, twice the 
length of the second; the third much elongated, narrower towards 
Its extremity, the apex nearly straight; the fourth subquadratc, with 
the anterior angles produced ; fifth flask-shaped, with a very sharp 
extremity : of the female, with the first five joints transverse qua- 
drate, anteriorly notched; the last elongate, subtriangular behind, 
subproduced : shell subcircular, the sides gradually converging into 
an angle behind ; hinder part truncate and granulate-margined : eyes 
narrower than their footstalks; orbits behind with two fissures, be- 
low, with one. 
V 1- At. heterodon. Shell granulated, the sides with seven serrulated 
teeth, and other smaller teeth between some ol the oilier teeth : 
hunt with three serrulated teeth, the middle ot which is the largest. 
Eeach, Maluc. Podoph. Brit. tab. 2. 
l’his elegant crab was discovered by Montagu on the southern 
coast of Devon, where it is not an uncommon species in deep water. 
^ o the fishermen it is well known by the name of Old Maris lace 
Crab. 
Fam. II. PoRTUNirijE. Txac/i. 
"I" tenv.ee moderate, simple: hinder pair of legs with compressed claws. 
Genus 3. PORTUMNUS. Leach. 
not thicker than their peduncles: orbits entire: anterior pair of 
le S s equal : other legs with compressed claws, internally towards their 
base dilated : Jifth pair with a compressed, foliaceous, lanceolate claw : 
