CLASS T. CRUSTACEA. 97 



Genus 31. PROCESSA. irac^. N ika. Risso. 

 Anterior pair of legx, with one side didact vie, the other armed with a 

 simple claw : second jiair unequal, didactvle, slender ', one very long;, 

 with the wrists and tore arm many-jointed ; the other shorter, with 

 the wrists many-jointed ; other legs terminated hy simple claws. 

 Sp. 1. Pro. canu/iculuta. Base of the rostrum with one tootli ; inter- 

 mediate lamella of the tail longitudinally canaliculated. 

 Processa canaliculata. Leach, Mul. Fodoph. li/it. tub. 41. 



The thighs of the third and fourth pairs of legs are spinulosc be- 

 neath; at the base of the rostrum there is an elevation dividing it 

 from the thorax. 



The above species, which forms the type of the genus, was dis- 

 covered at Torcross, on the southern coast of Devon, by Montagu. 



Stirps 3. — External antenna: inserted below the internal ones; interior 

 ones with two setae, one placed above the other. (^External lamella 

 of the tail composed but of one i>art.) 



a. Internal antenna with the superior sclee excavated below. Claxos 



spinulose. 

 Genus 3Q. PANDALUS. lA-ach. 



Anterior pair of legs adactyle; second pair didactyle, unequal. External 

 double palpi with the last joint of the internal footstalk longer than 

 the preceding joint. 



Sp. 1. Pan. unnuUcornis. Ilostrum ascending, many-toothed, apex 

 notched; inferior antennaj annulated with red, and internally spinu- 

 lose. 



Pandalus annulicornis. Leach, Malac. Podoph. Brit, tab, 40. — Trans. 

 Linn. Soc. xi. 346. — Suppl. to Encycl. Brit. i. 421. 



• Genus 33. HIPPOLYTE. Leach. 



Four anterior legs didactyle : external double palpi with the last joint of 



the internal footstalk shorter than the preceding joint. 

 Sp. 1. Hip. varians. Rostrum straight, with two teeth above and below j 



shell above and beneath the eyes with one spine. 

 Hippolyte varians. Leach, Trans. TJnn. Soc. xi. 347. — Supp. to Encycl. 



Brii. i. 4'21.— ill«/. Podoph. Brit. tab. 33. fg. 6—16. 

 Inhabits the rocky shores of the south of Devon. It varies much in 



colour, being often foimd red, green, and blueish green. 



b. Internal antennce loith the superior seta not excavated. Claws simple. 

 Genus 34. PEN.EUS. Fabr., Latr., Bosc, Leach. 

 Six anterior legs didactj'le: evte?iial double palpi wlthGLveexsertedjo'mtff 



the last of which is obtuse. 

 Sp. 1. Pen. trisulcatus. Thorax trisulcated behind ; rostrum descend- 

 ing, mullideiitate above. 



