80 On Hersilia (Clausidiuni) vaiicouverensis. 



Autcnnules ])eut upwards, numerous hairs ou upper edjjfc. 



Mandibles bearing a tootli with smooth edges and having 

 a row of hairs (PI. II. fig. 2). 



Considerable gap between maxillipeds and first thoracic 

 legs. 



Fifth thoracic leg broad, with a few fine hairs (fig. 3). 



Infects Callianassa pwjetttnsis. 



Hah. Near Nauaimo, Vancouver Island. 



The other appendages of the females of the two species are 

 similar. 



The males of the two species are alike, except that the 

 antennules are bent as in their respective females and. the 

 Vancouver Island form is slightly larger than the one from 

 Naples. 



Literature. 



1839. Hersilia npodifonnis, Philippi. " Einige zoologische Notizen.'' 



Arcliiv fur Naturgesch. Tafel iv. figs. 9-11, p. 128. 



1840. Hersilia apudiformis, Philippi. II. Mihie-Edwards, Hist. Nat. • 



des Crustaces, tome iii. pi. xxxvii. fig. 23, p. 417. 

 1866. Hersilia apodifortnis, Fhi\i-p]ti. C. Heller, " Carcinolog. Beitr. zur 



Faiiua del- adriat. Meeres." Verhaudl. zool.-bot. Gesellscb. 



Wien, Bd. xvi. p. 750. 

 1874. Clansidium testudo, Kossmann. " Ueber Clausidium .... &c." 



Verhandl. phys.-med. Ges. n. F. Bd. vii. Taf. vi. 

 1876. Hersilia apodiformis, Philippi. Glaus, " Neue Beitriige z. Kennt. 



par. Gop." Zeitschr. f. wias. Zool. Bd. xxv. 1, Taf. xxii. 

 1888. Hersilia apodiformis, Philippi. Ganu, " Les Gopepodes marins 



du Boul. (1) iii." Bull. Sc. de la Fr. et de la Belg. iii. s6r. 1, 



t. xix. p. 406. 



EXPLANATION OF PLATE II. 



Lettering. 



cw = antemiule ; fm' = antenna; /=lower lip; ??i = mandible ; m.r= 

 maxillule ; m.r' = maxilla ; jjuyj— maxilliped ; ^ = tooth of mandible; 

 ^e/=telson; th' -tti^ =ihov&c\c legs 1-5. 



Fig. 1. Hersilia vancouverensis, sp. n. Female, -with diminutive male 



attached to the lower part of the abdomen. 

 Fi(i. 2. Mandible of Hersilia vancouverensis. 

 Fig. 2a. Mandible of Hersilia apodiformis (Philippi). 

 Fig. 3. Fifth thoracic leg of Hersilia vancoin-eretisis. 

 Fig. 3 a. Fifth thoracic leg of Hersilia apodiformis. 



