CLASS I. CRTSTACEA. 97 



Genus 31. PROCESSA. Leach. Nika. Risso. 

 \ Anterior pair of legs, with one side didactyle, the other armed with a 

 ' simple claw : second pair unequal, didactyle, slender ; one very lone, 

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

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

 Sp. 1. Pro. curiuUculata. Base of the rostrum with one tooth ; inter- 

 mediate lamella of the tail longitudinally canaliculated. 

 Processa canaliculata. Leach, Mai. Podoph. Brit. tab. 41. 



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

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

 from the thorax. 



The above species, which forms the ts'pe 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 t^vo setae, one placed aljovc the other. {External lamella 

 of the tail composed but of one part.) 



a. Liternal antenna: with the superior seta: excavated below. Clares 



spinulose. 

 Genus 3'2. PAXDALUS. Leach. 



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

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

 the preceding joint. 



Sp. 1. Pan. annulicornis. Rostrum ascending, many-toothed, apex 

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

 lose. 



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

 Linn. Soc. \i. 346. — Snppl. to Encxjcl. Brit. i. 421. 



Genus 33. HIPPOLYTE. Leach. 

 Four antei'ior legs didactyle : external double palpi with the last joint of 



the internal footstalk shorter than the preceding joint. 

 Sp. 1. Hip. varians. Rostnmi straight, with t\vo teeth above and below ; 



shell above and beneath the eyes with one spine. 

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



Brit. i. 421. — Mai. Podoph. Brit. tab. 38. fg. 6—16. p 



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



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



b. Internal antenna with the superior seta not excavated. Claws simple. 



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

 Six anterior legs didactyle : e.vternal double palpi with five exserted joint^, 



the last of which is obtuse. 

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

 I ■ ing, multidentate above. 



