1 86 RATHBUN 



RAPHONOTUS SUBQUADRATUS (Dana). 



Fabia subquadrata HOLMES, Occas. Papers Calif. Acad. Sci., VII, 87, 1900 

 (part). 



Distribution. Alaska to Monterey, California. Specimens are in the 

 National Museum from: South entrance to Akutan Pass, Alaska, 45 

 fathoms (Albatross station 2843) I Monterey, in folds of Lucapina crenulata 

 (Dr. C. A. Canfield) ; Pacific Grove, from mantle cavity of Mytilus edulis 

 (John C. Brown). 



I believe that the specimens recorded from farther south than Mon- 

 terey Bay are a distinct species from R. subquadratus. Those seen and 

 described by Dr. Holmes from San Pedro as Fabia subquadrata are the 

 species which follows, R. lowei. 



RAPHONOTUS LOWEI Rathbun. 



Fabia subquadrata HOLMES, Occas. Papers Calif. Acad. Sci., VII, 87, 1900 



(part). 

 Raphonotus lowei RATHBUN, Amer. Nat., xxxiv, 590, 1900. 



General appearance like that of R. subquadratus; differs as follows : 

 In R. lowei the turned-down front has no trace of a transverse groove 

 and is naked ; in R. subquadratus the turned-down front has a shallow 

 transverse sulcus which is covered with pubescence. 



In JR. lowei the last joint of the maxilliped does not 

 reach the end of the penultimate joint, as it does in R. 

 subquadratus. 



In R. lowei the palm of the chela does not widen dis- 

 tally ; its margins are subparallel or a little convex ; its 

 lower surface has only one line of hair, which is con- 

 tinued to the end of the pollex ; in R. subquadratus the 

 FIG. 93 . Raphonotus palm widens a little distally, as figured by Dana, and 



lowei. 9 . San Pedro r / / 



Bay. a. Endognath of is furnished with two rows of hair below, the inner 



outer maxilliped (X 8). 



b. Chela (x 3*)- one of which is continued to the end of the pollex. 



In R. lowei the fingers are less arched and less gaping than in R. sub- 

 quadratus. 



The carapace is also a little wider in our species. 



Dimensions. Female, length of carapace 10 mm., width 12.5 mm., 

 length of merus of third ambulatory leg 5 mm. 



Distribution. San Pedro to San Diego, California: San Pedro Bay, 

 in siphon of Pholas pacifica, collected by H. N. Lowe, for whom the 

 species is named (type locality) ; San Pedro, in shell of Tapes (Holmes, 

 as Fabia subquadrata} \ San Diego (H. Hemphill), one of the specimens 



