238 CALIFORNIA ACADEMY OF SCIENCES. 



Caridea^ of North America. The species occurring 

 within oft near our limits of which figures are given are 

 the following: Alpheus cequalis (=Harfordi) ; Garidina 

 pasadence ; Crangon boreas; Crangon munitellus; Crangon 

 munitus; Crangon franciscorum; Hippolyte affinis; Hip- 

 polyte calif ornie'iT^is ; Hippolyte Gaimardii; Hippolyte 

 Layi; Hippolyte Phippsii; Hippolyte polaris; Heptacarpus 

 brcvirostris , Herdmani and, palpator (as Hippolyte); Hip- 

 polysmata californica; Palcemon Ritteri; Pandalus Dance; 

 Pandalus pubescentulus; Paracrangon echinatus; Syncaris 

 pacifica (as Acanthephyra). The large cheliped of Alpheus 

 Candei is figured, but whether the specimen from which 

 the figure was drawn came from the eastern or western 

 coast of North America is uncertain. The figure resem- 

 bles the cheliped of Alpheus clamator, and may have 

 been taken from a specimen of that species (see p. 184). 



The species here described as Syncaris pacifica is placed 

 by Kingsley in the genus Acanthephyra. The type of 

 Acanthephyra, viz., A. armata A. Milne-Edwards 1 is, 

 however, a marine species belonging properly to a differ- 

 ent family from that which includes Syncaris. In A. 

 armata the abdomen is carinated and the rostrum extends 

 back as a carina upon the carapace; there is no supra- 

 orbital spine, and the mandible is provided with a two- 

 jointed palp. In Syncaris neither the carapace nor the 

 abdomen is carinated, a supra-orbital spine is present, 

 and the mandible, as in the other genera of the AtyidaB, 

 is devoid of a palp. 



The second article consists of a key to Astacoid and 

 Thallassinoid Crustacea. Figures are given of the 

 chelipeds of Upogebia pugettensis, Callianassa gigas, lon- 

 gimana and calif orniensis . 



1 Ann. Sci. Nat. (6). T. XI, 1881, Art. No. 4, p. 12. 



